Order Now Product Folder Support & Community Tools & Software Technical Documents TPS62085, TPS62086, TPS62087 SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 TPS6208x, 3-A Step-Down Converter With Hiccup Short-Circuit Protection In 2-mm x 2mm VSON Package 1 Features 3 Description * * * * * * * * * * * * * * The TPS62085, TPS62086, and TPS62087 devices are high-frequency synchronous step-down converters optimized for small solution size and high efficiency. With an input voltage range of 2.5 V to 6.0 V, common battery technologies are supported. The devices focus on high-efficiency step-down conversion over a wide output current range. At medium to heavy loads, the converter operates in PWM mode and automatically enters Power Save Mode operation at light load to maintain high efficiency over the entire load current range. 1 DCS-ControlTM Topology Up to 95% Efficiency Hiccup Short-Circuit Protection Power Save Mode for Light Load Efficiency 100% Duty Cycle for Lowest Dropout 2.5-V to 6.0-V Input Voltage Range 17-A Operating Quiescent Current 0.8-V to VIN Adjustable Output Voltage 1.8-V and 3.3-V Fixed Output Voltage Output Discharge Power Good Output Thermal Shutdown Protection Available in 2-mm x 2-mm VSON Package Create a Custom Design Using the: - TPS62085 WEBENCH(R) Power Designer - TPS62086 WEBENCH(R) Power Designer - TPS62087 WEBENCH(R) Power Designer To address the requirements of system power rails, the internal compensation circuit allows a large selection of external output capacitor values ranging from 10 F to 150 F. Together with its DCS-Control architecture, excellent load transient performance and output voltage regulation accuracy are achieved. The devices are available in a 2-mm x 2-mm VSON package. Device Information(1) PART NUMBER 2 Applications * * * * PACKAGE BODY SIZE (NOM) TPS62085 TPS62086 Battery-Powered Applications Point-of-Load Processor Supplies Hard Disk Drives VSON (7) 2.00 mm x 2.00 mm TPS62087 (1) For all available packages, see the orderable addendum at the end of the data sheet. 4 Typical Application Schematic TPS62087 VIN 2.5V to 6V C1 10F VIN SW EN VOS L1 0.47H R3 1M C2 22F Typical Application Efficiency VOUT 1.8V/3A 100 FB 90 PG POWER GOOD Efficiency (%) GND 80 70 Vin = 2.5V Vin = 3.3V Vin = 4.2V Vin = 5.0V 60 Vout = 1.8 V 50 0.001 0.010 0.100 Iout (A) 1.000 C004 1 An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications, intellectual property matters and other important disclaimers. PRODUCTION DATA. TPS62085, TPS62086, TPS62087 SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 www.ti.com Table of Contents 1 2 3 4 5 6 7 8 9 Features .................................................................. Applications ........................................................... Description ............................................................. Typical Application Schematic............................. Revision History..................................................... Device Options....................................................... Pin Configuration and Functions ......................... Specifications......................................................... 1 1 1 1 2 3 3 3 8.1 8.2 8.3 8.4 8.5 8.6 3 4 4 4 4 5 Absolute Maximum Ratings ...................................... ESD Ratings.............................................................. Recommended Operating Conditions....................... Thermal Information .................................................. Electrical Characteristics........................................... Typical Characteristics .............................................. Detailed Description .............................................. 6 9.1 Overview ................................................................... 6 9.2 Functional Block Diagram ......................................... 6 9.3 Feature Description................................................... 7 9.4 Device Functional Modes.......................................... 8 10 Application and Implementation.......................... 9 10.1 Application Information............................................ 9 10.2 Typical Application ................................................. 9 11 Power Supply Recommendations ..................... 15 12 Layout................................................................... 15 12.1 Layout Guidelines ................................................. 15 12.2 Layout Example .................................................... 15 12.3 Thermal Considerations ........................................ 15 13 Device and Documentation Support ................. 16 13.1 13.2 13.3 13.4 13.5 13.6 13.7 Device Support...................................................... Documentation Support ........................................ Related Links ........................................................ Community Resources.......................................... Trademarks ........................................................... Electrostatic Discharge Caution ............................ Glossary ................................................................ 16 16 16 16 17 17 17 14 Mechanical, Packaging, and Orderable Information ........................................................... 17 5 Revision History NOTE: Page numbers for previous revisions may differ from page numbers in the current version. Changes from Revision A (June 2015) to Revision B Page * Changed package name from QFN to VSON in the Features list ......................................................................................... 1 * Added Webench links to the data sheet ................................................................................................................................ 1 * Added SW node AC value in Absolute Maximum Ratings table ........................................................................................... 3 * Changed fPFM To: fPSM in Equation 1 ..................................................................................................................................... 7 * Added Figure 2 to Power Save Mode section........................................................................................................................ 7 * Added Table 1 to Power Good section ................................................................................................................................. 8 * Changed Murata inductor part number in Table 5 ............................................................................................................... 11 Changes from Original (October 2013) to Revision A * 2 Page Added ESD Ratings table, Feature Description section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable Information section .................................................................................................. 1 Submit Documentation Feedback Copyright (c) 2013-2018, Texas Instruments Incorporated Product Folder Links: TPS62085 TPS62086 TPS62087 TPS62085, TPS62086, TPS62087 www.ti.com SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 6 Device Options (1) PART NUMBER (1) OUTPUT VOLTAGE TPS62085RLT Adjustable TPS62086RLT 3.3 V TPS62087RLT 1.8 V For detailed ordering information, please check the Mechanical, Packaging, and Orderable Information section at the end of this datasheet. 7 Pin Configuration and Functions RLT Package 7-Pin VSON Top View EN 1 PG 2 FB 3 VOS 4 7 VIN 6 SW 5 GND Pin Functions PIN NAME NO. I/O DESCRIPTION EN 1 IN Device enable pin. To enable the device, this pin needs to be pulled high. Pulling this pin low disables the device. This pin has a pulldown resistor of typically 400 k when the device is disabled. FB 3 IN Feedback pin. For the fixed output voltage versions this pin must be connected to the output voltage. GND 5 PG 2 OUT Power good open drain output pin. The pullup resistor can not be connected to any voltage higher than 6 V. If unused, leave it floating. SW 6 PWR Switch pin of the power stage. VIN 7 PWR Input voltage pin. VOS 4 IN Ground pin. Output voltage sense pin. This pin must be directly connected to the output capacitor. 8 Specifications 8.1 Absolute Maximum Ratings over operating free-air temperature range (unless otherwise noted) (1) Voltage at Pins (2) Temperature (1) (2) (3) MIN MAX VIN, FB, VOS, EN, PG -0.3 7 SW (DC) UNIT -0.3 VIN + 0.3 SW (AC, less than 100ns) (3) -3 11 V Operating Junction, TJ -40 150 C Storage, Tstg -65 150 C Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings only and functional operation of the device at these or any other conditions beyond those indicated under Recommended Operating Conditions is not implied. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability. All voltage values are with respect to network ground terminal. While switching. Copyright (c) 2013-2018, Texas Instruments Incorporated Product Folder Links: TPS62085 TPS62086 TPS62087 Submit Documentation Feedback 3 TPS62085, TPS62086, TPS62087 SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 www.ti.com 8.2 ESD Ratings VALUE V(ESD) (1) (2) Electrostatic discharge Human body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1) 2000 Charged device model (CDM), per JEDEC specification JESD22C101 (2) 500 UNIT V JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process. JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process. 8.3 Recommended Operating Conditions (1) MIN NOM VIN Input voltage range 2.5 ISINK_PG Sink current at PG pin VPG Pullup resistor voltage TJ Operating junction temperature (1) -40 MAX UNIT 6 V 1 mA 6 V 125 C Refer to Application and Implementation for further information. 8.4 Thermal Information TPS6208x THERMAL METRIC (1) RLT [VSON] UNIT 7 PINS RJA Junction-to-ambient thermal resistance 107.8 C/W RJC(top) Junction-to-case (top) thermal resistance 66.2 C/W RJB Junction-to-board thermal resistance 17.1 C/W JT Junction-to-top characterization parameter 2.1 C/W JB Junction-to-board characterization parameter 17.1 C/W RJC(bot) Junction-to-case (bottom) thermal resistance N/A C/W (1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application report (SPRA953). 8.5 Electrical Characteristics TJ = -40 C to 125 C, and VIN = 3.6 V. Typical values are at TJ = 25 C, unless otherwise noted. PARAMETER TEST CONDITIONS MIN TYP MAX UNIT SUPPLY VIN Input voltage range IQ Quiescent current into VIN No load, device not switching TJ = -40 C to 85 C, VIN = 2.5 V to 5.5 V ISD Shutdown current into VIN EN = Low, TJ = -40 C to 85 C, VIN = 2.5 V to 5.5 V Undervoltage lockout threshold VIN falling Undervoltage lockout hysteresis VIN rising 200 mV Thermal shutdown threshold TJ rising 150 C Thermal shutdown hysteresis TJ falling 20 C VUVLO TJSD 2.5 2.1 6 V 17 25 A 0.7 5 A 2.2 2.3 V LOGIC INTERFACE EN VIH High-level input voltage VIN = 2.5 V to 6.0 V VIL Low-level input voltage VIN = 2.5 V to 6.0 V 1.0 V IEN,LKG Input leakage current into EN pin EN = High 0.01 RPD Pulldown resistance at EN pin EN = Low 400 0.4 0.16 V A k SOFT START, POWER GOOD tSS VPG 4 Soft-start time Power good threshold Submit Documentation Feedback Time from EN high to 95% of VOUT nominal 0.8 ms VOUT rising, referenced to VOUT nominal 93% 95% 98% VOUT falling, referenced to VOUT nominal 88% 90% 93% Copyright (c) 2013-2018, Texas Instruments Incorporated Product Folder Links: TPS62085 TPS62086 TPS62087 TPS62085, TPS62086, TPS62087 www.ti.com SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 Electrical Characteristics (continued) TJ = -40 C to 125 C, and VIN = 3.6 V. Typical values are at TJ = 25 C, unless otherwise noted. PARAMETER TEST CONDITIONS VPG,OL Low-level output voltage Isink = 1 mA IPG,LKG Input leakage current into PG pin VPG = 5.0 V MIN TYP MAX UNIT 0.4 V 0.01 0.16 A V OUTPUT Output voltage range, TPS62085 VOUT Output voltage accuracy, TPS62086, TPS62087 (1) 0.8 VIN IOUT = 1 A, VIN VOUT + 1 V, PWM mode -1.0% 1.0% IOUT = 0 A, VIN VOUT + 1 V, PSM mode -1.0% IOUT = 1A , VIN VOUT + 1 V, PWM mode 792 800 808 IOUT = 0 A, VIN VOUT + 1 V, PSM mode 792 800 817 0.1 2.1% VFB Feedback regulation voltage (1) (2) IFB,LKG Feedback input leakage current VFB = 1 V 0.01 RDIS Output discharge resistor EN = LOW, VOUT = 1.8 V 260 Line regulation IOUT = 1 A, VIN = 2.5 V to 6.0 V 0.02 %/V Load regulation IOUT = 0.5 A to 3 A 0.16 %/A mV A POWER SWITCH RDS(on) High-side FET ON-resistance ISW = 500 mA 31 56 m Low-side FET ON-resistance ISW = 500 mA 23 45 m 4.6 5.5 ILIM High-side FET switch current limit fSW PWM switching frequency (1) (2) 3.7 IOUT = 1 A 2.4 A MHz For more information, see Power Save Mode. Conditions: L = 0.47 H, COUT = 22 F 8.6 Typical Characteristics Switching Frequency (Hz) 10M 1M 100k 10k Vout = 1.2 V 1000 0.001 Vin = 2.5 V Vin = 3.6 V Vin = 6.0 V 0.010 0.100 1.000 Iout (A) C007 Figure 1. Switching Frequency Copyright (c) 2013-2018, Texas Instruments Incorporated Product Folder Links: TPS62085 TPS62086 TPS62087 Submit Documentation Feedback 5 TPS62085, TPS62086, TPS62087 SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 www.ti.com 9 Detailed Description 9.1 Overview The TPS62085, TPS62086, and TPS62087 synchronous step-down converters are based on the DCS-Control (Direct Control with Seamless transition into Power Save Mode) topology. This is an advanced regulation topology that combines the advantages of hysteretic, voltage, and current mode control schemes. The DCS-Control topology operates in PWM (pulse width modulation) mode for medium to heavy load conditions and in Power Save Mode at light load currents. In PWM mode, the converter operates with its nominal switching frequency of 2.4 MHz, having a controlled frequency variation over the input voltage range. As the load current decreases, the converter enters Power Save Mode, reducing the switching frequency and minimizing the IC quiescent current to achieve high efficiency over the entire load current range. Because DCS-Control supports both operation modes (PWM and PSM) within a single building block, the transition from PWM mode to Power Save Mode is seamless and without effects on the output voltage. Fixed output voltage version provides smallest solution size combined with lowest no load current. The devices offer both excellent DC voltage and superior load transient regulation, combined with very low output voltage ripple, minimizing interference with RF circuits. 9.2 Functional Block Diagram PG Hiccup Counter VFB VREF EN 400 k (2) VIN High Side Current Sense Bandgap Undervoltage Lockout Thermal Shutdown SW MOSFET Driver Control Logic GND Ramp Comparator Timer ton Direct Control and Compensation VOS R1 (1) FB Error Amplifier DCS - Control TM EN VREF R2 (1) 260 Output Discharge Logic Note: (1) R1, R2 are implemented in the fixed output voltage versions only. (2) When the device is enabled, the 400 k resistor is disconnected. 6 Submit Documentation Feedback Copyright (c) 2013-2018, Texas Instruments Incorporated Product Folder Links: TPS62085 TPS62086 TPS62087 TPS62085, TPS62086, TPS62087 www.ti.com SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 9.3 Feature Description 9.3.1 Power Save Mode As the load current decreases, the TPS62085, TPS62086, and TPS62087 enter Power Save Mode (PSM) operation. During Power Save Mode, the converter operates with reduced switching frequency and with a minimum quiescent current maintaining high efficiency. The power save mode occurs when the inductor current becomes discontinuous. Power Save Mode is based on a fixed on-time architecture, as related in Equation 1. The switching frequency over the whole load current range is also shown in Figure 1 for a typical application. t ON = 420 ns V OUT V IN 2 I OUT f PSM = t ON2 V IN V OUT V IN - V OUT L (1) In Power Save Mode, the output voltage rises slightly above the nominal output voltage, as shown in Figure 9. This effect is minimized by increasing the output capacitor or inductor value. The output voltage accuracy in PSM operation is reflected in the electrical specification table and given for a 22-F output capacitor. During PAUSE period in PSM (shown in Figure 2 ), the device does not change the PG pin state nor does it detect an UVLO event, in order to achieve a minimum quiescent current and maintain high efficiency at light loads. VOUT tPAUSE IINDUCTOR tON Figure 2. Power Save Mode Waveform Diagram 9.3.2 100% Duty Cycle Low Dropout Operation The devices offer low input-to-output voltage difference by entering 100% duty cycle mode. In this mode, the high-side MOSFET switch is constantly turned on and the low-side MOSFET is switched off. This is particularly useful in battery powered applications to achieve the longest operation time by taking full advantage of the whole battery voltage range. The minimum input voltage to maintain output regulation, depending on the load current and output voltage can be calculated as: VIN,MIN = VOUT + IOUT,MAX (RDS(on) + RL ) with * * * * VIN,MIN = Minimum input voltage to maintain an output voltage IOUT,MAX = Maximum output current RDS(on) = High-side FET ON-resistance RL = Inductor ohmic resistance (DCR) (2) 9.3.3 Soft Start The TPS62085, TPS62086, and TPS62087 have an internal soft-start circuitry which monotonically ramps up the output voltage and reaches the nominal output voltage during a soft-start time of typically 0.8 ms. This avoids excessive inrush current and creates a smooth output voltage slope. It also prevents excessive voltage drops of primary cells and rechargeable batteries with high internal impedance. The device is able to start into a prebiased output capacitor. The device starts with the applied bias voltage and ramps the output voltage to its nominal value. Copyright (c) 2013-2018, Texas Instruments Incorporated Product Folder Links: TPS62085 TPS62086 TPS62087 Submit Documentation Feedback 7 TPS62085, TPS62086, TPS62087 SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 www.ti.com Feature Description (continued) 9.3.4 Switch Current Limit and Hiccup Short-Circuit Protection The switch current limit prevents the devices from high inductor current and from drawing excessive current from the battery or input voltage rail. Excessive current might occur with a shorted or saturated inductor or a heavy load or shorted output circuit condition. If the inductor current reaches the threshold ILIM, the high-side MOSFET is turned off and the low-side MOSFET is turned on to ramp down the inductor current. When this switch current limits is triggered 32 times, the devices stop switching and enable the output discharge. The devices then automatically start a new start-up after a typical delay time of 66 s has passed. This is named HICCUP shortcircuit protection. The devices repeat this mode until the high load condition disappears. 9.3.5 Undervoltage Lockout To avoid misoperation of the device at low input voltages, an undervoltage lockout (UVLO) is implemented, which shuts down the devices at voltages lower than VUVLO with a hysteresis of 200 mV. 9.3.6 Thermal Shutdown The device goes into thermal shutdown and stops switching when the junction temperature exceeds TJSD. When the device temperature falls below the threshold by 20C, the device returns to normal operation automatically. 9.4 Device Functional Modes 9.4.1 Enable and Disable The devices are enabled by setting the EN pin to a logic HIGH. Accordingly, shutdown mode is forced if the EN pin is pulled LOW with a shutdown current of typically 0.7 A. In shutdown mode, the internal power switches as well as the entire control circuitry are turned off. An internal resistor of 260 discharges the output through the VOS pin smoothly. The output discharge function also works when thermal shutdown, UVLO, or short-circuit protection are triggered. An internal pulldown resistor of 400 k is connected to the EN pin when the EN pin is LOW. The pulldown resistor is disconnected when the EN pin is HIGH. 9.4.2 Power Good The TPS62085, TPS62086, and TPS62087 have a power good output. The power good goes high impedance once the output is above 95% of the nominal voltage, and is driven low once the output voltage falls below typically 90% of the nominal voltage. The PG pin is an open-drain output and is specified to sink up to 1 mA. The power good output requires a pullup resistor connecting to any voltage rail less than 6 V. The PG signal can be used for sequencing of multiple rails by connecting it to the EN pin of other converters. Leave the PG pin unconnected when not used. Table 1 shows the PG pin logic. Table 1. PG Pin Logic LOGIC STATUS DEVICE CONDITIONS HIGH Z EN = High, VFB VPG Enable LOW EN = High, VFB < VPG Shutdown EN = Low Thermal Shutdown TJ > TJSD UVLO 0.5 V < VIN < VUVLO Power Supply Removal VIN 0.5 V 8 Submit Documentation Feedback Copyright (c) 2013-2018, Texas Instruments Incorporated Product Folder Links: TPS62085 TPS62086 TPS62087 TPS62085, TPS62086, TPS62087 www.ti.com SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 10 Application and Implementation NOTE Information in the following applications sections is not part of the TI component specification, and TI does not warrant its accuracy or completeness. TI's customers are responsible for determining suitability of components for their purposes. Customers should validate and test their design implementation to confirm system functionality. 10.1 Application Information The TPS62085 is a synchronous step-down converter in which output voltage is adjusted by component selection. The following section discusses the design of the external components to complete the power supply design for several input and output voltage options by using typical applications as a reference. The TPS62086 and TPS62087 devices provide a fixed output voltage which does not need an external resistor divider. 10.2 Typical Application TPS62085 VIN 2.5V to 6V C1 10F VIN SW EN VOS L1 0.47H R1 80.6k R3 1M VOUT 1.2V/3A C2 22F FB GND PG R2 162k POWER GOOD Figure 3. 1.2-V Output Voltage Application 10.2.1 Design Requirements For this design example, use the parameters listed in Table 2 as the input parameters. Table 2. Design Parameters DESIGN PARAMETER EXAMPLE VALUE Input voltage 2.5 V to 6 V Output voltage 1.2 V Output ripple voltage <20 mV Maximum output current 3A Table 3 lists the components used for the example. Table 3. List of Components REFERENCE DESCRIPTION MANUFACTURER C1 10 F, Ceramic capacitor, 6.3 V, X7R, size 0805, GRM21BR71A106ME51L Murata C2 22 F, Ceramic capacitor, 6.3 V, X5R, size 0805, GRM21BR60J226ME39L Murata L1 0.47 H, Power Inductor, size 4 mm x 4 mm x 1.5 mm, XFL4015-471ME Coilcraft R1 Depending on the output voltage, 1%, size 0603; 0 for TPS62086, TPS62087 Std R2 162 k, Chip resistor, 1/16 W, 1%, size 0603; open for TPS62086, TPS62087 Std R3 1 M, Chip resistor, 1/16 W, 1%, size 0603 Std 10.2.2 Detailed Design Procedure 10.2.2.1 Custom Design With WEBENCH(R) Tools Click here to create a custom design using the TPS62085 device with the WEBENCH(R) Power Designer. Click here to create a custom design using the TPS62086 device with the WEBENCH(R) Power Designer. Click here to create a custom design using the TPS62087 device with the WEBENCH(R) Power Designer. Copyright (c) 2013-2018, Texas Instruments Incorporated Product Folder Links: TPS62085 TPS62086 TPS62087 Submit Documentation Feedback 9 TPS62085, TPS62086, TPS62087 SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 www.ti.com 1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements. 2. Optimize the design for key parameters such as efficiency, footprint, and cost using the optimizer dial. 3. Compare the generated design with other possible solutions from Texas Instruments. The WEBENCH Power Designer provides a customized schematic along with a list of materials with real-time pricing and component availability. In most cases, these actions are available: * Run electrical simulations to see important waveforms and circuit performance * Run thermal simulations to understand board thermal performance * Export customized schematic and layout into popular CAD formats * Print PDF reports for the design, and share the design with colleagues Get more information about WEBENCH tools at www.ti.com/WEBENCH. 10.2.2.2 Setting The Output Voltage The output voltage is set by an external resistor divider according to Equation 3: R1 o R1 o ae ae VOUT = VFB c 1 + = 0.8 V c 1 + / / e R2 o e R2 o (3) R2 must not be higher than 180 k to achieve high efficiency at light load while providing acceptable noise sensitivity. Lowest operating quiescent current and best output voltage accuracy are achieved with the fixed output voltage versions. For the fixed output voltage versions, the FB pin must be connected to the output. 10.2.2.3 Output Filter Design The inductor and the output capacitor together provide a low-pass filter. To simplify the selection process, Table 4 outlines possible inductor and capacitor value combinations for most applications. Table 4. Matrix of Output Capacitor and Inductor Combinations NOMINAL L [H] (1) NOMINAL COUT [F] (2) 10 0.47 1 + 22 47 100 150 + (3) + + + + + + + 2.2 (1) (2) (3) Inductor tolerance and current derating is anticipated. The effective inductance can vary by 20% and -30%. Capacitance tolerance and bias voltage derating is anticipated. The effective capacitance can vary by 20% and -50%. Typical application configuration. Other '+' mark indicates recommended filter combinations. 10.2.2.4 Inductor Selection The main parameter for the inductor selection is the inductor value and then the saturation current of the inductor. To calculate the maximum inductor current under static load conditions, Equation 4 is given. DI IL,MAX = IOUT,MAX + L 2 VOUT VIN DIL = VOUT L fSW 1- where * * * * 10 IOUT,MAX = Maximum output current IL = Inductor current ripple fSW = Switching frequency L = Inductor value Submit Documentation Feedback (4) Copyright (c) 2013-2018, Texas Instruments Incorporated Product Folder Links: TPS62085 TPS62086 TPS62087 TPS62085, TPS62086, TPS62087 www.ti.com SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 TI recommends choosing the saturation current for the inductor 20% to 30% higher than the IL,MAX, out of Equation 4. A higher inductor value is also useful to lower ripple current but increases the transient response time as well. The following inductors are recommended to be used in designs. Table 5. List of Recommended Inductors INDUCTANCE [H] CURRENT RATING [A] DIMENSIONS L x W x H [mm3] DC RESISTANCE [m typical] 0.47 0.47 6.6 4 x 4 x 1.5 7.6 Coilcraft XFL4015-471 6.7 3.2 x 2.5 x 1.2 23 Murata DFE322512F-R47N 1 5.1 4x4x2 10.8 Coilcraft XFL4020-102 PART NUMBER 10.2.2.5 Capacitor Selection The input capacitor is the low-impedance energy source for the converters which helps to provide stable operation. A low ESR multilayer ceramic capacitor is recommended for best filtering and must be placed between VIN and GND as close as possible to those pins. For most applications, 10 F is sufficient, though a larger value reduces input current ripple. The architecture of the TPS62085, TPS62086, and TPS62087 allows the use of tiny ceramic output capacitors with low equivalent series resistance (ESR). These capacitors provide low output voltage ripple and are recommended. To keep its low resistance up to high frequencies and to get narrow capacitance variation with temperature, TI recommends using X7R or X5R dielectrics. The recommended typical output capacitor value is 22 F; this capacitance can vary over a wide range as outline in the output filter selection table. Output capacitors above 150 F may be used with a reduced load current during startup to avoid triggering the short circuit protection. A feed-forward capacitor is not required for device proper operation. 10.2.3 Application Curves VIN = 3.6 V, VOUT = 1.2 V, TA = 25 C, unless otherwise noted Table 6. Table of Graphs FIGURE TPS62085, VOUT = 0.95 V Figure 4 TPS62085, VOUT = 1.2 V Figure 5 TPS62086, VOUT = 3.3 V Figure 6 TPS62087, VOUT = 1.8 V Figure 7 Line Regulation TPS62085 Figure 8 Load Regulation TPS62085 Figure 9 Switching Frequency TPS62085 Figure 1 TPS62085, PWM Operation (Load = 3 A) Figure 10 TPS62085, PSM Operation (Load = 100 mA) Figure 11 TPS62085, Load Sweep (Load = Open to 3 A) Figure 12 TPS62085, Start-Up (Load = 0.47 ) Figure 13 TPS62085, Start-Up (Load = Open) Figure 14 TPS62085, Shutdown (Load = 0.47 ) Figure 15 TPS62085, Shutdown (Load = Open) Figure 16 TPS62085, Load Transient (Load = 0.5 A to 3 A) Figure 17 TPS62085, Load Transient (Load = 50 mA to 3 A) Figure 18 TPS62085, Output Short-Circuit Protection (Load = 0.47 , Entry) Figure 19 TPS62085, Output Short-Circuit Protection (Load = 0.47 , Recovery) Figure 20 TPS62085, Output Short-Circuit Protection (Load = 0.47 , HICCUP Zoom In) Figure 21 Efficiency Waveforms Copyright (c) 2013-2018, Texas Instruments Incorporated Product Folder Links: TPS62085 TPS62086 TPS62087 Submit Documentation Feedback 11 TPS62085, TPS62086, TPS62087 www.ti.com 100 100 90 90 Efficiency (%) Efficiency (%) SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 80 70 Vin = 2.5 V Vin = 3.3 V Vin = 4.2 V Vin = 5.0 V 60 Vout = 0.95 V 50 0.001 0.010 0.100 70 Vout = 1.2 V 50 0.001 0.010 0.100 90 90 Efficiency (%) 100 80 70 Vin = 3.6 V 60 80 70 Vin = 2.5V Vin = 3.3V Vin = 4.2V Vin = 5.0V 60 Vin = 4.2 V Vout = 1.8 V 50 0.001 Vin = 5.0 V 0.010 0.100 1.000 Iout (A) 1.206 Vout (V) Vout (V) 1.206 1.200 1.194 Vout = 1.2 V, Iout = 1 A 1.188 4.5 5.0 Vin (V) Submit Documentation Feedback 5.5 TA = -40 C TA = 25 C TA = 85 C Vout = 1.2 V, Vin = 3.6 V 6.0 1.188 0.001 0.010 0.100 Iout (A) C005 Figure 8. Line Regulation 12 C004 1.200 1.194 TA = -40 C TA = 25 C TA = 85 C 4.0 1.000 Figure 7. Efficiency 1.212 3.5 0.100 Iout (A) 1.212 3.0 0.010 C003 Figure 6. Efficiency 2.5 C002 Figure 5. Efficiency 100 Vout = 3.3 V 50 0.001 1.000 Iout (A) C001 Figure 4. Efficiency Efficiency (%) Vin = 2.5 V Vin = 3.3 V Vin = 4.2 V Vin = 5.0 V 60 1.000 Iout (A) 80 1.000 C006 Figure 9. Load Regulation Copyright (c) 2013-2018, Texas Instruments Incorporated Product Folder Links: TPS62085 TPS62086 TPS62087 TPS62085, TPS62086, TPS62087 www.ti.com SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 t -- 500ns/div t -- 300ns/div Vout (AC, 20mV/div) Vout (AC, 20mV/div) Icoil (DC, 1A/div) Icoil (DC, 1A/div) SW (DC, 5V/div) SW (DC, 5V/div) Figure 10. PWM Operation, Load = 3 A Figure 11. PSM Operation, Load = 100 mA t -- 200s/div Load (DC, 2A/div) t -- 200s/div EN (DC, 5V/div) Vout (AC, 50mV/div) PG (DC, 5V/div) Vout (DC, 0.5V/div) Icoil (DC, 2A/div) Icoil (DC, 2A/div) Figure 12. Load Sweep, Load = Open to 3 A Figure 13. Start-Up, Load = 0.47 t -- 200s/div t -- 5s/div EN (DC, 5V/div) EN (DC, 5V/div) Vout (DC, 0.5V/div) PG (DC, 5V/div) PG (DC, 5V/div) Vout (DC, 0.5V/div) Icoil (DC, 2A/div) Icoil (DC, 0.5A/div) Figure 14. Start-Up, Load = Open Figure 15. Shutdown, Load = 0.47 Copyright (c) 2013-2018, Texas Instruments Incorporated Product Folder Links: TPS62085 TPS62086 TPS62087 Submit Documentation Feedback 13 TPS62085, TPS62086, TPS62087 SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 www.ti.com t -- 5ms/div EN (DC, 5V/div) t -- 2s/div Load (DC, 2A/div) Vout (DC, 0.5V/div) PG (DC, 5V/div) PG (DC, 5V/div) Vout (DC, 0.1V/div) Icoil (DC, 0.5A/div) Icoil (DC, 2A/div) Figure 16. Shutdown, Load = Open Figure 17. Load Transient, Load = 0.5 A to 3 A t -- 3s/div Load (DC, 2A/div) t -- 200s/div PG (DC, 5V/div) Vout (DC, 0.5V/div) PG (DC, 5V/div) Vout (DC, 0.1V/div) Icoil (DC, 2A/div) Icoil (DC, 2A/div) Figure 18. Load Transient, Load = 50 mA to 3 A Figure 19. Output Short-Circuit Protection, Load = 0.47 , Entry t -- 200s/div PG (DC, 5V/div) Vout (DC, 0.5V/div) Vout (DC, 0.5V/div) Icoil (DC, 2A/div) Icoil (DC, 2A/div) Figure 20. Output Short-Circuit Protection, Load = 0.47 , Recovery 14 Submit Documentation Feedback t -- 5s/div PG (DC, 5V/div) Figure 21. Output Short-Circuit Protection, Load = 0.47 , HICCUP Zoom In Copyright (c) 2013-2018, Texas Instruments Incorporated Product Folder Links: TPS62085 TPS62086 TPS62087 TPS62085, TPS62086, TPS62087 www.ti.com SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 11 Power Supply Recommendations The device is designed to operate from an input voltage supply range from 2.5 V to 6 V. Ensure that the input power supply has a sufficient current rating for the application. 12 Layout 12.1 Layout Guidelines The printed-circuit-board (PCB) layout is an important step to maintain the high performance of the TPS62085, TPS62086, and TPS62087 devices. The input and output capacitors and the inductor must be placed as close as possible to the IC. This keeps the traces short. Routing these traces direct and wide results in low trace resistance and low parasitic inductance. The low side of the input and output capacitors must be connected directly to the GND pin to avoid a ground potential shift. The sense traces connected to FB and VOS pins are signal traces. Special care must be taken to avoid noise being induced. By a direct routing, parasitic inductance can be kept small. GND layers might be used for shielding. Keep these traces away from SW nodes. See Figure 22 for the recommended PCB layout. 12.2 Layout Example L1 VOUT VIN C1 GND VOS SW FB EN VIN C2 PG Solution Size 2 62 mm GND R2 R1 Figure 22. PCB Layout Recommendation 12.3 Thermal Considerations Implementation of integrated circuits in low-profile and fine-pitch surface-mount packages typically requires special attention to power dissipation. Many system-dependent issues such as thermal coupling, airflow, added heat sinks and convection surfaces, and the presence of other heat-generating components affect the power dissipation limits of a given component. Two basic approaches for enhancing thermal performance are: * Improving the power dissipation capability of the PCB design * Introducing airflow in the system The Thermal Data section in the TPS62085EVM-169 Evaluation Module User's Guide (SLVU809) provides the thermal metric of the device on the EVM after considering the PCB design of real applications. The big copper planes connecting to the pads of the IC on the PCB improve the thermal performance of the device. For more details on how to use the thermal parameters, see the Thermal Characteristics Application Notes, SZZA017 and SPRA953. Copyright (c) 2013-2018, Texas Instruments Incorporated Product Folder Links: TPS62085 TPS62086 TPS62087 Submit Documentation Feedback 15 TPS62085, TPS62086, TPS62087 SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 www.ti.com 13 Device and Documentation Support 13.1 Device Support 13.1.1 Third-Party Products Disclaimer TI'S PUBLICATION OF INFORMATION REGARDING THIRD-PARTY PRODUCTS OR SERVICES DOES NOT CONSTITUTE AN ENDORSEMENT REGARDING THE SUITABILITY OF SUCH PRODUCTS OR SERVICES OR A WARRANTY, REPRESENTATION OR ENDORSEMENT OF SUCH PRODUCTS OR SERVICES, EITHER ALONE OR IN COMBINATION WITH ANY TI PRODUCT OR SERVICE. 13.1.2 Custom Design With WEBENCH(R) Tools Click here to create a custom design using the TPS62085 device with the WEBENCH(R) Power Designer. Click here to create a custom design using the TPS62086 device with the WEBENCH(R) Power Designer. Click here to create a custom design using the TPS62087 device with the WEBENCH(R) Power Designer. 1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements. 2. Optimize the design for key parameters such as efficiency, footprint, and cost using the optimizer dial. 3. Compare the generated design with other possible solutions from Texas Instruments. The WEBENCH Power Designer provides a customized schematic along with a list of materials with real-time pricing and component availability. In most cases, these actions are available: * Run electrical simulations to see important waveforms and circuit performance * Run thermal simulations to understand board thermal performance * Export customized schematic and layout into popular CAD formats * Print PDF reports for the design, and share the design with colleagues Get more information about WEBENCH tools at www.ti.com/WEBENCH. 13.2 Documentation Support 13.2.1 Related Documentation For related documentation, see the following: * TPS62085EVM-169 Evaluation Module User's Guide, SLVU809 * Thermal Characteristics Application Note, SZZA017 * Thermal Characteristics Application Note, SPRA953 13.3 Related Links The table below lists quick access links. Categories include technical documents, support and community resources, tools and software, and quick access to sample or buy. Table 7. Related Links PARTS PRODUCT FOLDER SAMPLE & BUY TECHNICAL DOCUMENTS TOOLS & SOFTWARE SUPPORT & COMMUNITY TPS62085 Click here Click here Click here Click here Click here TPS62086 Click here Click here Click here Click here Click here TPS62087 Click here Click here Click here Click here Click here 13.4 Community Resources The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of Use. TI E2ETM Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration 16 Submit Documentation Feedback Copyright (c) 2013-2018, Texas Instruments Incorporated Product Folder Links: TPS62085 TPS62086 TPS62087 TPS62085, TPS62086, TPS62087 www.ti.com SLVSB70B - OCTOBER 2013 - REVISED JULY 2018 Community Resources (continued) among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help solve problems with fellow engineers. Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and contact information for technical support. 13.5 Trademarks DCS-Control, E2E are trademarks of Texas Instruments. WEBENCH is a registered trademark of Texas Instruments. 13.6 Electrostatic Discharge Caution These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam during storage or handling to prevent electrostatic damage to the MOS gates. 13.7 Glossary SLYZ022 -- TI Glossary. This glossary lists and explains terms, acronyms, and definitions. 14 Mechanical, Packaging, and Orderable Information The following pages include mechanical, packaging, and orderable information. This information is the most current data available for the designated devices. This data is subject to change without notice and revision of this document. For browser-based versions of this data sheet, refer to the left-hand navigation. Copyright (c) 2013-2018, Texas Instruments Incorporated Product Folder Links: TPS62085 TPS62086 TPS62087 Submit Documentation Feedback 17 PACKAGE OPTION ADDENDUM www.ti.com 18-Jul-2018 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Pins Package Drawing Qty Eco Plan Lead/Ball Finish MSL Peak Temp (2) (6) (3) Op Temp (C) Device Marking (4/5) TPS62085RLTR ACTIVE VSON-HR RLT 7 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 PD5Q TPS62085RLTT ACTIVE VSON-HR RLT 7 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 PD5Q TPS62086RLTR ACTIVE VSON-HR RLT 7 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 PD4Q TPS62086RLTT ACTIVE VSON-HR RLT 7 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 PD4Q TPS62087RLTR ACTIVE VSON-HR RLT 7 3000 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 PD3Q TPS62087RLTT ACTIVE VSON-HR RLT 7 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM -40 to 125 PD3Q (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may reference these types of products as "Pb-Free". RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption. Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based flame retardants must also meet the <=1000ppm threshold requirement. (3) MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. (4) There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device. (5) Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation of the previous line and the two combined represent the entire Device Marking for that device. Addendum-Page 1 Samples PACKAGE OPTION ADDENDUM www.ti.com 18-Jul-2018 (6) Lead/Ball Finish - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead/Ball Finish values may wrap to two lines if the finish value exceeds the maximum column width. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. Addendum-Page 2 PACKAGE MATERIALS INFORMATION www.ti.com 18-Jul-2018 TAPE AND REEL INFORMATION *All dimensions are nominal Device Package Package Pins Type Drawing SPQ Reel Reel A0 Diameter Width (mm) (mm) W1 (mm) B0 (mm) K0 (mm) P1 (mm) W Pin1 (mm) Quadrant TPS62085RLTR VSONHR RLT 7 3000 180.0 8.4 2.3 2.3 1.15 4.0 8.0 Q2 TPS62085RLTT VSONHR RLT 7 250 180.0 8.4 2.3 2.3 1.15 4.0 8.0 Q2 TPS62086RLTR VSONHR RLT 7 3000 180.0 8.4 2.3 2.3 1.15 4.0 8.0 Q2 TPS62086RLTT VSONHR RLT 7 250 180.0 8.4 2.3 2.3 1.15 4.0 8.0 Q2 TPS62086RLTT VSONHR RLT 7 250 179.0 8.4 2.2 2.2 1.2 4.0 8.0 Q2 TPS62087RLTR VSONHR RLT 7 3000 180.0 8.4 2.3 2.3 1.15 4.0 8.0 Q2 TPS62087RLTT VSONHR RLT 7 250 180.0 8.4 2.3 2.3 1.15 4.0 8.0 Q2 Pack Materials-Page 1 PACKAGE MATERIALS INFORMATION www.ti.com 18-Jul-2018 *All dimensions are nominal Device Package Type Package Drawing Pins SPQ Length (mm) Width (mm) Height (mm) TPS62085RLTR VSON-HR RLT 7 3000 210.0 185.0 35.0 TPS62085RLTT VSON-HR RLT 7 250 210.0 185.0 35.0 TPS62086RLTR VSON-HR RLT 7 3000 210.0 185.0 35.0 TPS62086RLTT VSON-HR RLT 7 250 210.0 185.0 35.0 TPS62086RLTT VSON-HR RLT 7 250 203.0 203.0 35.0 TPS62087RLTR VSON-HR RLT 7 3000 210.0 185.0 35.0 TPS62087RLTT VSON-HR RLT 7 250 210.0 185.0 35.0 Pack Materials-Page 2 PACKAGE OUTLINE RLT0007A VSON - 1 mm max height PLASTIC SMALL OUTLINE - NO LEAD 2.1 1.9 B A 1 PIN 1 INDEX AREA 2.1 1.9 C 1 MAX 0.08 SEATING PLANE 0.05 0.00 3X 0.5 0.3 (0.2) TYP (0.2) TYP 3X 0.5 4 5 1.2 1.5 4X 0.3 0.2 0.1 0.05 C A C 2X 0.6 7 1 3X 1.4 1.2 B 0.5 0.3 PIN 1 ID 3X 0.35 0.25 0.1 0.05 C A C B 4220429/A 09/2014 NOTES: 1. 2. All linear dimensions are in millimeters. Any dimensions in parenthesis are for reference only. Dimensioning and tolerancing per ASME Y14.5M. This drawing is subject to change without notice. www.ti.com EXAMPLE BOARD LAYOUT RLT0007A VSON - 1 mm max height PLASTIC SMALL OUTLINE - NO LEAD PKG (0.6) 1 (0.25) 7 2X (0.6) PKG 3X (0.5) 3X (0.25) 5 4 3X (0.3) 3X (1.5) 3X (0.6) (0.9) (0.45) LAND PATTERN EXAMPLE SCALE: 30X 0.07 MAX ALL AROUND 0.07 MIN ALL AROUND METAL SOLDER MASK OPENING SOLDER MASK OPENING METAL UNDER SOLDER MASK NON SOLDER MASK DEFINED PADS 1 - 4 SOLDER MASK DEFINED PADS 5 - 7 SOLDER MASK DETAILS NOTES: (continued) 3. 4. 5. For more information, see Texas Instruments literature number SLUA271 (www.ti.com/lit/slua271). Solder mask tolerances between and around signal pads can vary based on board fabrication site. Vias should not be placed on soldering pads unless they are plugged or plated shut. www.ti.com 4220429/A 09/2014 EXAMPLE STENCIL DESIGN RLT0007A VSON - 1 mm max height PLASTIC SMALL OUTLINE - NO LEAD PKG 6X (0.65) (0.6) (0.21) 1 7 EXPOSED METAL TYP 2X (0.6) PKG 3X (0.5) METAL UNDER SOLDER MASK TYP 3X (0.21) 6X (0.3) 4 5 3X (0.025) 3X (0.6) (0.9) (0.875) 3X EXPOSED METAL SOLDER MASK EDGE TYP SOLDER PASTE EXAMPLE BASED ON 0.125 mm THICK STENCIL FOR ALL EXPOSED PADS 85% PRINTED SOLDER COVERAGE BY AREA SCALE: 40X 4220429/A 09/2014 NOTES: (continued) 6. Laser cutting apertures with trapezoidal walls and rounded corners may offer better paste release. IPC-7525 may have alternate design recommendations. www.ti.com IMPORTANT NOTICE Texas Instruments Incorporated (TI) reserves the right to make corrections, enhancements, improvements and other changes to its semiconductor products and services per JESD46, latest issue, and to discontinue any product or service per JESD48, latest issue. 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