300 mA, Low Dropout CMOS Linear Regulator ADP1712/ADP1713/ADP1714 TYPICAL APPLICATION CIRCUITS FEATURES Mobile phones Digital camera and audio devices Portable and battery-powered equipment Post dc-dc regulation VOUT = 3.3V 1 IN 2 GND 3 EN OUT 5 2.2F 2.2F 06455-001 10nF SS 4 Figure 1. ADP1712 with Fixed Output Voltage and Soft-Start Capacitor, 3.3 V ADP1712 ADJUSTABLE VIN = 5.5V 1 IN 2 GND VOUT = 0.8V(1 + R1/R2) OUT 5 2.2F 2.2F R1 3 EN ADJ 4 06455-002 R2 Figure 2. ADP1712 with Adjustable Output Voltage, 0.8 V to 5.0 V ADP1713 VIN = 3V 1 IN OUT 2 GND VOUT = 0.75V 5 2.2F 2.2F 10nF 3 EN BYP 4 Figure 3. ADP1713 with Fixed Output Voltage and Bypass Capacitor, 0.75 V ADP1714 VIN = 3V VOUT 1 IN 2 GND 3 EN OUT VOUT (V) 5 2.2F 2.2F 3 2 1 TRK 4 0V TO 5V 0 1 2 3 4 5 VTRK (V) 06455-004 APPLICATIONS ADP1712 VIN = 5V 06455-003 Maximum output current: 300 mA Input voltage range: 2.5 V to 5.5 V Light load efficient IGND = 75 A with 100 A load Low shutdown current: <1 A Very low dropout voltage: 170 mV @ 300 mA load Initial accuracy: 1% Accuracy over line, load, and temperature: 2% 16 fixed output voltage options with soft start: 0.75 V to 3.3 V (ADP1712) Adjustable output voltage option: 0.8 V to 5.0 V (ADP1712 Adjustable) 16 fixed output voltage options with reference bypass: 0.75 V to 3.3 V (ADP1713) 16 fixed output voltage options with tracking: 0.75 V to 3.3 V (ADP1714) Low output noise: 40 V rms High PSRR: 72 dB @ 1 kHz Stable with small 2.2 F ceramic output capacitor Excellent load/line transient response Current limit and thermal overload protection Logic controlled enable 5-lead TSOT package Figure 4. ADP1714 with Output Voltage Tracking GENERAL DESCRIPTION The ADP1712/ADP1713/ADP1714, available in a tiny, 5-lead TSOT package, are low dropout linear regulators that operate from 2.5 V to 5.5 V and provide up to 300 mA of output current. The low 170 mV dropout voltage at a 300 mA load improves efficiency and allows operation over a wide input voltage range. Using a novel scaling architecture, ground current is a very low 75 A when driving a 100 A load, making the ADP1712/ ADP1713/ADP1714 ideal for battery-operated portable equipment. The ADP1712/ADP1713/ADP1714 are available in 16 fixed output voltage options. The ADP1712 is also available in an adjustable version, which allows output voltages that range from 0.8 V to 5 V via an external divider. The ADP1712 fixed version allows an external capacitor to be connected to program the soft-start time. The ADP1713 allows a reference bypass capacitor to be connected, which reduces output voltage noise and improves power supply rejection. The ADP1714 includes a tracking feature, which allows the output to follow an external voltage rail or reference. The ADP1712/ADP1713/ADP1714 are optimized for stable operation with small 2.2 F ceramic output capacitors, allowing good transient performance while occupying minimal board space. An enable pin controls the output voltage on all devices, and an undervoltage lockout circuit disables the regulator if IN drops below a minimum threshold. The parts also have short circuit protection and thermal overload protection, which prevent damage to the devices in adverse conditions. Rev. A Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 (c)2007-2009 Analog Devices, Inc. All rights reserved. ADP1712/ADP1713/ADP1714 TABLE OF CONTENTS Features .............................................................................................. 1 Adjustable Output Voltage (ADP1712 Adjustable) ............... 11 Applications ....................................................................................... 1 Bypass Capacitor (ADP1713) ................................................... 11 Typical Application Circuits............................................................ 1 Track Mode (ADP1714) ............................................................ 11 General Description ......................................................................... 1 Enable Feature ............................................................................ 11 Revision History ............................................................................... 2 Undervoltage Lockout (UVLO) ............................................... 11 Specifications..................................................................................... 3 Application Information ................................................................ 12 Absolute Maximum Ratings............................................................ 5 Capacitor Selection .................................................................... 12 Thermal Resistance ...................................................................... 5 Current Limit and Thermal Overload Protection ................. 12 ESD Caution .................................................................................. 5 Thermal Considerations............................................................ 13 Pin Configurations and Function Descriptions ........................... 6 Printed Circuit Board Layout Considerations ....................... 14 Typical Performance Characteristics ............................................. 7 Outline Dimensions ....................................................................... 15 Theory of Operation ...................................................................... 10 Ordering Guide .......................................................................... 15 Soft-Start Function (ADP1712) ................................................ 10 REVISION HISTORY 6/09--Rev. 0 to Rev. A Updated Outline Dimensions ....................................................... 15 Changes to Ordering Guide .......................................................... 15 1/07--Revision 0: Initial Version Rev. A | Page 2 of 16 ADP1712/ADP1713/ADP1714 SPECIFICATIONS VIN = (VOUT + 0.5 V) or 2.5 V (whichever is greater), IOUT = 10 mA, CIN = COUT = 2.2 F, TA = 25C, unless otherwise noted. Table 1. Parameter INPUT VOLTAGE RANGE OPERATING SUPPLY CURRENT Symbol VIN IGND SHUTDOWN CURRENT IGND-SD FIXED OUTPUT VOLTAGE ACCURACY (ADP1712 FIXED, ADP1713, AND ADP1714) ADJUSTABLE OUTPUT VOLTAGE ACCURACY (ADP1712 ADJUSTABLE) 1 LINE REGULATION LOAD REGULATION 2 VOUT VOUT/VIN VOUT/IOUT DROPOUT VOLTAGE 3 VDROPOUT VOUT Conditions TJ = -40C to +125C IOUT = 0 A IOUT = 0 A, TJ = -40C to +125C IOUT = 100 A IOUT = 100 A, TJ = -40C to +125C IOUT = 100 mA IOUT = 100 mA, TJ = -40C to +125C IOUT = 300 mA IOUT = 300 mA, TJ = -40C to +125C EN = GND EN = GND, TJ = -40C to +125C IOUT = 10 mA 100 A < IOUT < 300 mA, TJ = -40C to +125C Min 2.5 IOUT = 10 mA 100 A < IOUT < 300 mA, TJ = -40C to +125C VIN = (VOUT + 0.5 V) to 5.5 V, TJ = -40C to +125C IOUT = 10 mA to 300 mA IOUT = 10 mA to 300 mA, TJ = -40C to +125C IOUT = 100 mA, VOUT 3.0 V IOUT = 100 mA, VOUT 3.0 V, TJ = -40C to +125C IOUT = 300 mA, VOUT 3.0 V IOUT = 300 mA, VOUT 3.0 V, TJ = -40C to +125C IOUT = 100 mA, 2.5 V VOUT < 3.0 V IOUT = 100 mA, 2.5 V VOUT < 3.0 V, TJ = -40C to +125C IOUT = 300 mA, 2.5 V VOUT < 3.0 V IOUT = 300 mA, 2.5 V VOUT < 3.0 V, TJ = -40C to +125C 0.792 0.784 -0.25 Typ Max 5.5 60 70 75 85 210 250 365 420 0.1 1.0 +1 +2 -1 -2 0.8 0.8 0.808 0.816 +0.25 0.004 70 80 205 230 85 95 V V %/ V %/mA %/mA mV mV mV mV mV mV 235 270 mV mV 700 s ms s mA 0.001 60 170 70 200 START-UP TIME 4 ADP1712 Adjustable and ADP1714 ADP1712 External Soft Start ADP1713 CURRENT LIMIT THRESHOLD 5 THERMAL SHUTDOWN THRESHOLD ILIMIT TSSD THERMAL SHUTDOWN HYSTERESIS TSSD-HYS SOFT-START SOURCE CURRENT (ADP1712 WITH EXTERNAL SOFT START) UVLO ACTIVE THRESHOLD UVLO INACTIVE THRESHOLD UVLO HYSTERESIS VOUT to VTRK ACCURACY (ADP1714) SSI-SOURCE SS = GND 0.8 UVLOACTIVE UVLOINACTIVE UVLOHYS VTRK-ERROR VIN falling VIN rising 2 Unit V A A A A A A A A A A % % TSTART-UP CSS = 10 nF With 10 nF bypass capacitor 380 TJ rising 70 7.3 90 500 150 C 15 1.2 1.5 -40 +40 V V mV mV -80 +80 mV 2.45 250 0 V VTRK (0.5 x VOUT(NOM)), VOUT(NOM) 1.8 V, TJ = -40C to +125C 0 V VTRK (0.5 x VOUT(NOM)), VOUT(NOM) > 1.8 V, TJ = -40C to +125C Rev. A | Page 3 of 16 C A ADP1712/ADP1713/ADP1714 Parameter EN INPUT LOGIC HIGH EN INPUT LOGIC LOW EN INPUT LEAKAGE CURRENT ADJ INPUT BIAS CURRENT (ADP1712 ADJUSTABLE) OUTPUT NOISE ADP1713 ADP1712 and ADP1714 POWER SUPPLY REJECTION RATIO ADP1713 ADP1712 and ADP1714 Symbol VIH VIL VI-LEAKAGE ADJI-BIAS Conditions 2.5 V VIN 5.5 V 2.5 V VIN 5.5 V EN = IN or GND Min 1.8 Typ Max 0.1 30 0.4 1 100 Unit V V A nA OUTNOISE 10 Hz to 100 kHz, VIN = 5.0 V, VOUT = 0.75 V, with 10 nF bypass capacitor 10 Hz to 100 kHz, VIN = 5.0 V, VOUT = 3.3 V 40 V rms 380 V rms 1 kHz, VIN = 5.0 V, VOUT = 0.75 V, with 10 nF bypass capacitor 1 kHz, VIN = 5.0 V, VOUT = 3.3 V 72 dB 65 dB PSRR 1 Accuracy when OUT is connected directly to ADJ. When OUT voltage is set by external feedback resistors, absolute accuracy in adjust mode depends on the tolerances of resistors used. 2 Based on an end-point calculation using 10 mA and 300 mA loads. See Figure 10 for typical load regulation performance for loads less than 10 mA. 3 Dropout voltage is defined as the input-to-output voltage differential when the input voltage is set to the nominal output voltage. This applies only for output voltages above 2.5 V. 4 Start-up time is defined as the time between the rising edge of EN to OUT being at 95% of its nominal value. 5 Current limit threshold is defined as the current at which the output voltage drops to 90% of the specified typical value. For example, the current limit for a 1.0 V output voltage is defined as the current that causes the output voltage to drop to 90% of 1.0 V, or 0.9 V. Rev. A | Page 4 of 16 ADP1712/ADP1713/ADP1714 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 2. Parameter IN to GND OUT to GND EN to GND SS/ADJ/BYP/TRK to GND Storage Temperature Range Operating Junction Temperature Range Lead Temperature, Soldering (10 sec) Soldering Conditions Rating -0.3 V to +6 V -0.3 V to IN -0.3 V to +6 V -0.3 V to +6 V -65C to +150C -40C to +125C 300C JEDEC J-STD-020 JA is specified for the worst-case conditions, that is, a device soldered in a circuit board for surface-mount packages. Table 3. Thermal Resistance Package Type 5-Lead TSOT ESD CAUTION Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. This is a stress rating only; functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. Rev. A | Page 5 of 16 JA 170 Unit C/W ADP1712/ADP1713/ADP1714 IN 1 OUT TOP VIEW (Not to Scale) GND 2 4 SS Figure 5. 5-Lead TSOT (UJ-Suffix) EN 3 ADP1712 5 IN 1 OUT ADJUSTABLE TOP VIEW (Not to Scale) GND 2 4 ADJ Figure 6. 5-Lead TSOT (UJ-Suffix) EN 3 ADP1713 5 OUT IN 1 GND 2 TOP VIEW (Not to Scale) 4 BYP 06455-007 EN 3 5 FIXED 06455-006 GND 2 ADP1712 06455-005 IN 1 Figure 7. 5-Lead TSOT (UJ-Suffix) EN 3 ADP1714 5 OUT 4 TRK TOP VIEW (Not to Scale) 06455-008 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Figure 8. 5-Lead TSOT (UJ-Suffix) Table 4. Pin Function Descriptions ADP1712 Fixed Pin No. 1 2 3 ADP1712 Adjustable Pin No. 1 2 3 ADP1713 Pin No. 1 2 3 ADP1714 Pin No. 1 2 3 4 SS 4 ADJ BYP 4 5 Mnemonic IN GND EN 5 5 4 TRK 5 OUT Description Regulator Input Supply. Bypass IN to GND with a 2.2 F or greater capacitor. Ground. Enable Input. Drive EN high to turn on the regulator; drive it low to turn off the regulator. For automatic startup, connect EN to IN. Soft Start. Connect a capacitor between SS and GND to set the output start-up time. Adjust. A resistor divider from OUT to ADJ sets the output voltage. Bypass. Connect a 1 nF or greater capacitor (10 nF recommended) between BYP and GND to reduce the internal reference noise for low noise applications. Track. The output follows the voltage placed on the TRK pin. (See the Theory of Operation section for a more detailed description.) Regulated Output Voltage. Bypass OUT to GND with a 2.2 F or greater capacitor. Rev. A | Page 6 of 16 ADP1712/ADP1713/ADP1714 TYPICAL PERFORMANCE CHARACTERISTICS VIN = 3.8 V, IOUT = 10 mA, CIN = COUT = 2.2 F, TA = 25C, unless otherwise noted. 3.32 450 ILOAD = 300mA 400 3.31 350 ILOAD = 200mA 3.29 3.28 ILOAD ILOAD ILOAD ILOAD ILOAD ILOAD 3.27 = 100A = 1mA = 10mA = 100mA = 200mA = 300mA 3.26 -40 250 ILOAD = 100mA 200 150 ILOAD = 10mA 100 ILOAD = 1mA 50 10 60 110 TJ (C) ILOAD = 100A 0 -40 10 60 110 06455-012 IGND (A) 300 06455-009 VOUT (V) 3.30 TJ (C) Figure 9. Output Voltage vs. Junction Temperature Figure 12. Ground Current vs. Junction Temperature 3.304 400 3.302 350 300 3.300 IGND (A) VOUT (V) 250 3.298 3.296 200 150 3.294 100 3.292 1 10 1000 100 ILOAD (mA) 0 0.1 06455-010 3.290 0.1 1 10 1000 100 ILOAD (mA) Figure 10. Output Voltage vs. Load Current 06455-013 50 Figure 13. Ground Current vs. Load Current 3.305 500 450 3.300 400 ILOAD = 300mA IGND (A) 3.295 3.290 3.280 3.3 250 ILOAD = 100mA 200 ILOAD = 10mA 150 = 100A = 1mA = 10mA = 100mA = 200mA = 300mA 3.8 ILOAD = 200mA 300 ILOAD = 1mA 100 ILOAD = 100A 50 4.3 4.8 VIN (V) 5.3 Figure 11. Output Voltage vs. Input Voltage 0 3.3 3.8 4.3 4.8 VIN (V) Figure 14. Ground Current vs. Input Voltage Rev. A | Page 7 of 16 5.3 06455-014 3.285 ILOAD ILOAD ILOAD ILOAD ILOAD ILOAD 06455-011 VOUT (V) 350 ADP1712/ADP1713/ADP1714 180 160 120 LOAD SWITCHED FROM 10mA TO 300mA 100 20mV/DIV VDROPOUT (mV) 140 80 60 VOUT VIN = 5V VOUT = 3.3V CIN = 2.2F COUT = 2.2F 0 0.1 1 10 1000 100 ILOAD (mA) 06455-015 20 TIME (20s/DIV) Figure 15. Dropout Voltage vs. Load Current 06455-018 40 Figure 18. Load Transient Response 3.35 3.30 LOAD SWITCHED FROM 10mA TO 300mA 3.15 ILOAD ILOAD ILOAD ILOAD ILOAD ILOAD 3.10 3.05 3.00 3.20 3.25 3.30 3.35 3.40 3.45 VOUT = 100A = 1mA = 10mA = 100mA = 200mA = 300mA 3.50 3.55 3.60 VIN (V) VIN = 5V VOUT = 3.3V CIN = 10F COUT = 10F TIME (20s/DIV) 06455-019 20mV/DIV 3.20 06455-016 VOUT (V) 3.25 Figure 19. Load Transient Response Figure 16. Output Voltage vs. Input Voltage (in Dropout) 1000 ILOAD = 300mA 900 800 VIN STEP FROM 4V TO 5V ILOAD = 10mA 300 ILOAD = 200mA 200 100 ILOAD = 1mA ILOAD = 100A 0 3.20 3.25 3.30 3.35 3.40 3.45 3.50 3.55 VIN (V) 3.60 1 2 VIN = 5V VOUT = 3.3V CIN = 10F COUT = 10F ILOAD = 300mA VOUT TIME (100s/DIV) Figure 20. Line Transient Response Figure 17. Ground Current vs. Input Voltage (in Dropout) Rev. A | Page 8 of 16 06455-020 400 ILOAD = 100mA 2V/DIV 500 10mV/DIV 600 06455-017 IGND (A) 700 ADP1712/ADP1713/ADP1714 16 -50 VRIPPLE = 50mV ILOAD = 10mA COUT = 2.2F FREQUENCY = 10kHz 14 -55 10 PSRR (dB) 8 6 VOUT = 2.4V -60 VOUT = 1.6V -65 4 2 5 10 15 20 25 CSS (nF) -70 2.7 Figure 21. Output Voltage Ramp-Up Time vs. Soft-Start Capacitor Value -20 4.2 4.7 Figure 23. ADP1712 Adjustable Power Supply Rejection Ratio vs. Input Voltage -45 VRIPPLE = 50mV VIN = 5V VOUT = 0.75V COUT = 2.2F -50 VRIPPLE = 50mV VIN = 5V COUT = 2.2F FREQUENCY = 10kHz ILOAD = 100mA ILOAD = 100mA ILOAD = 10mA PSRR (dB) -30 -40 -50 -55 ILOAD = 10mA -60 -60 ILOAD = 1mA -70 -65 -80 -90 10 ILOAD = 100A 100 1k 10k 100k 1M 10M FREQUENCY (Hz) 06455-037 PSRR (dB) 3.7 VIN (V) 0 -10 3.2 06455-038 0 06455-036 0 VOUT = 0.8V -70 0.8 1.3 1.8 2.3 2.8 3.3 3.8 4.3 VOUT (V) Figure 24. ADP1712 Adjustable Power Supply Rejection Ratio vs. Output Voltage Figure 22. ADP1713 Power Supply Rejection Ratio vs. Frequency (10 nF Bypass Capacitor) Rev. A | Page 9 of 16 06455-039 RAMP-UP TIME (ms) 12 ADP1712/ADP1713/ADP1714 THEORY OF OPERATION The ADP1712/ADP1713/ADP1714 are low dropout linear regulators that use an advanced, proprietary architecture to provide high power supply rejection ratio (PSRR) and excellent line and load transient response with just a small 2.2 F ceramic output capacitor. All devices operate from a 2.5 V to 5.5 V input rail and provide up to 300 mA of output current. Incorporating a novel scaling architecture, ground current is very low when driving light loads. Ground current in the shutdown mode is typically less than 1 A. IN For applications that require a controlled startup, the ADP1712 provides a programmable soft-start function. Programmable soft start is useful for reducing inrush current upon startup and for providing voltage sequencing. To implement soft start, connect a small ceramic capacitor from SS to GND. Upon startup, a 1.2 A current source charges this capacitor. The ADP1712 start-up output voltage is limited by the voltage at SS, providing a smooth ramp up to the nominal output voltage. The soft-start time is calculated by TSS = VREF x (CSS/ISS) OUT (1) where: TSS is the soft-start period. VREF is the 0.8 V reference voltage. CSS is the soft-start capacitance from SS to GND. ISS is the current sourced from SS (1.2 A). CURRENT LIMIT THERMAL PROTECT REFERENCE GND When the ADP1712 is disabled (using EN), the soft-start capacitor is discharged to GND through an internal 100 resistor. SS/ ADJ/ BYP/ TRK 06455-023 SHUTDOWN AND UVLO EN SOFT-START FUNCTION (ADP1712) EN VIN = 5V VOUT = 3.3V COUT = 2.2F CSS = 22nF ILOAD = 300mA 2 TIME (4ms/DIV) 06455-040 2V/DIV OUT Figure 26. OUT Ramp-Up with External Soft-Start Capacitor The ADP1712 adjustable version, ADP1713, and ADP1714 have no pins for soft start, so the function is switched to an internal soft-start capacitor. This sets the soft-start ramp-up period to approximately 24 s. Rev. A | Page 10 of 16 1 2 VIN = 5V VOUT = 1.6V COUT = 2.2F ILOAD = 10mA OUT TIME (20s/DIV) Figure 27. OUT Ramp-Up with Internal Soft-Start 06455-041 A logic on the EN pin determines if the output is active. When EN is high, the output is on, and when EN is low, the output is off. EN 2V/DIV The ADP1712 is available in two versions, one with a fixed output voltage and one with an adjustable output voltage. The fixed output voltage is set internally to one of sixteen values between 0.75 V and 3.3 V, using an internal feedback network. The adjustable output voltage can be set to between 0.8 V and 5.0 V by an external voltage divider connected from OUT to ADJ. The ADP1713 and ADP1714 are available in fixed output voltage options only. The ADP1712 fixed version allows an external soft-start capacitor to be connected between the SS pin and GND, which controls the output voltage ramp during startup. The ADP1713 allows a reference bypass capacitor to be connected between the BYP pin and GND, which reduces output voltage noise and improves power supply rejection. The ADP1714 features a track pin, which allows the output voltage to follow the voltage at the TRK pin. 1 1V/DIV Internally, the ADP1712/ADP1713/ADP1714 each consist of a reference, an error amplifier, a feedback voltage divider, and a PMOS pass transistor. Output current is delivered via the PMOS pass device, which is controlled by the error amplifier. The error amplifier compares the reference voltage with the feedback voltage from the output and amplifies the difference. If the feedback voltage is lower than the reference voltage, the gate of the PMOS device is pulled lower, which allows more current to pass and increases the output voltage. If the feedback voltage is higher than the reference voltage, the gate of the PMOS device is pulled higher, allowing less current to pass and decreasing the output voltage. 2V/DIV Figure 25. Internal Block Diagram ADP1712/ADP1713/ADP1714 ADJUSTABLE OUTPUT VOLTAGE (ADP1712 ADJUSTABLE) ENABLE FEATURE The ADP1712 adjustable version can have its output voltage set over a 0.8 V to 5.0 V range. The output voltage is set by connecting a resistive voltage divider from OUT to ADJ. The output voltage is calculated using the equation VOUT = 0.8 V (1 + R1/R2) The ADP1712/ADP1713/ADP1714 use the EN pin to enable and disable the OUT pin under normal operating conditions. As shown in Figure 29, when a rising voltage on EN crosses the active threshold, OUT turns on. When a falling voltage on EN crosses the inactive threshold, OUT turns off. (2) where: R1 is the resistor from OUT to ADJ. R2 is the resistor from ADJ to GND. EN BYPASS CAPACITOR (ADP1713) OUT 1 VIN = 5V VOUT = 1.6V COUT = 2.2F ILOAD = 10mA The ADP1713 allows for an external bypass capacitor to be connected to the internal reference, which reduces output voltage noise and improves power supply rejection. A low leakage capacitor of 1 nF or greater (10 nF is recommended) must be connected between the BYP and GND pins. TIME (4ms/DIV) 06455-025 500mV/DIV The maximum bias current into ADJ is 100 nA, so for less than 0.5% error due to the bias current, use values less than 60 k for R2. Figure 29. ADP1712 Adjustable Typical EN Pin Operation The ADP1714 includes a tracking mode feature. As shown in Figure 28, if the voltage applied at the TRK pin is less than the nominal output voltage, OUT is equal to the voltage at TRK. Otherwise, OUT regulates to its nominal output value. For example, consider an ADP1714 with a nominal output voltage of 3 V. If the voltage applied to its TRK pin is greater than 3 V, OUT maintains a nominal output voltage of 3 V. If the voltage applied to TRK is reduced below 3 V, OUT tracks this voltage. OUT can track the TRK pin voltage from the nominal value all the way down to 0 V. A voltage divider is present from TRK to the error amplifier input with a divider ratio equal to the divider from OUT to the error amplifier. This sets the output voltage equal to the tracking voltage. Both divider ratios are set by postpackage trim, depending on the desired output voltage. 4 As can be seen, the EN pin has hysteresis built in. This prevents on/off oscillations that can occur due to noise on the EN pin as it passes through the threshold points. The EN pin active/inactive thresholds are derived from the IN voltage. Therefore, these thresholds vary with changing input voltage. Figure 30 shows typical EN active/inactive thresholds when the input voltage varies from 2.5 V to 5.5 V. 1.4 1.3 TYPICAL EN THRESHOLDS (V) TRACK MODE (ADP1714) 1.2 1.1 EN ACTIVE HYSTERESIS 1.0 0.9 0.8 0.7 EN INACTIVE 0.5 2.50 2.75 3.00 3.25 3.50 3.75 4.00 4.25 4.50 4.75 5.00 5.25 5.50 3 2 UNDERVOLTAGE LOCKOUT (UVLO) The ADP1712/ADP1713/ADP1714 have an undervoltage lockout circuit, which monitors the voltage on the IN pin. When the voltage on IN drops below 2 V (minimum), the circuit activates, disabling the OUT pin. 1 0 0 1 2 3 4 VTRK (V) 5 06455-024 VOUT (V) VIN (V) Figure 30. Typical EN Pin Thresholds vs. Input Voltage Figure 28. ADP1714 Output Voltage vs. Tracking Voltage with Nominal Output Voltage Set to 3 V Rev. A | Page 11 of 16 06455-026 0.6 ADP1712/ADP1713/ADP1714 APPLICATION INFORMATION especially when long input traces or high source impedance are encountered. If greater than 2.2 F of output capacitance is required, increasing the input capacitor to match is recommended. CAPACITOR SELECTION Output Capacitor The ADP1712/ADP1713/ADP1714 are designed for operation with small, space-saving ceramic capacitors, but they function with most commonly used capacitors as long as care is taken about the effective series resistance (ESR) value. The ESR of the output capacitor affects stability of the LDO control loop. A minimum of 2.2 F capacitance with an ESR of 500 m or less is recommended to ensure stability of the ADP1712/ADP1713/ADP1714. Transient response to changes in load current is also affected by output capacitance. Using a larger value of output capacitance improves the transient response of the ADP1712/ADP1713/ADP1714 to large changes in load current. Figure 31 and Figure 32 show the transient responses for output capacitance values of 2.2 F and 10 F, respectively. Input and Output Capacitor Properties Any good quality ceramic capacitors can be used with the ADP1712/ADP1713/ADP1714, as long as they meet the minimum capacitance and maximum ESR requirements. Ceramic capacitors are manufactured with a variety of dielectrics, each with different behavior over temperature and applied voltage. Capacitors must have a dielectric adequate to ensure the minimum capacitance over the necessary temperature range and dc bias conditions. X5R or X7R dielectrics with a voltage rating of 6.3 V or 10 V are recommended. Y5V and Z5U dielectrics are not recommended, due to their poor temperature and dc bias characteristics. The ADP1712/ADP1713/ADP1714 are protected against damage due to excessive power dissipation by current and thermal overload protection circuits. The ADP1712/ADP1713/ADP1714 are designed to current limit when the output load reaches 500 mA (typical). When the output load exceeds 500 mA, the output voltage is reduced to maintain a constant current limit. VOUT RESPONSE TO LOAD STEP FROM 10mA TO 300mA VIN = 5V VOUT = 3.3V CIN = 2.2F COUT = 2.2F TIME (20s/DIV) Thermal overload protection is included, which limits the junction temperature to a maximum of 150C (typical). Under extreme conditions (that is, high ambient temperature and power dissipation), when the junction temperature starts to rise above 150C, the output is turned off, reducing the output current to zero. When the junction temperature drops below 135C (typical), the output is turned on again and output current is restored to its nominal value. 06455-027 20mV/DIV CURRENT LIMIT AND THERMAL OVERLOAD PROTECTION Consider the case where a hard short from OUT to ground occurs. At first the ADP1712/ADP1713/ADP1714 current limit, so that only 500 mA is conducted into the short. If self heating of the junction is great enough to cause its temperature to rise above 150C, thermal shutdown activates, turning off the output and reducing the output current to zero. As the junction temperature cools and drops below 135C, the output turns on and conducts 500 mA into the short, again causing the junction temperature to rise above 150C. This thermal oscillation between 135C and 150C causes a current oscillation between 500 mA and 0 mA, which continues as long as the short remains at the output. VOUT RESPONSE TO LOAD STEP FROM 10mA TO 300mA VIN = 5V VOUT = 3.3V CIN = 10F COUT = 10F TIME (20s/DIV) 06455-028 20mV/DIV Figure 31. Output Transient Response, COUT = 2.2 F Figure 32. Output Transient Response, COUT = 10 F Input Bypass Capacitor Connecting a 2.2 F capacitor from the IN pin to GND reduces the circuit sensitivity to printed circuit board (PCB) layout, Current and thermal limit protections are intended to protect the device against accidental overload conditions. For reliable operation, device power dissipation needs to be externally limited so junction temperatures do not exceed 125C. Rev. A | Page 12 of 16 ADP1712/ADP1713/ADP1714 THERMAL CONSIDERATIONS 140 MAX TJ (DO NOT OPERATE ABOVE THIS POINT) 120 100 TJ (C) 80 60 40 20 0 0.5 1mA 10mA 1.0 30mA 80mA 1.5 2.0 Table 5. 3.0 3.5 4.0 4.5 5.0 VIN - VOUT (V) JA (C/W) 170 152 146 134 131 Figure 33. 500 mm2 of PCB Copper, TA = 25C 140 MAX TJ (DO NOT OPERATE ABOVE THIS POINT) 120 100 Device soldered to minimum size pin traces. The junction temperature of the ADP1712/ADP1713/ADP1714 can be calculated from the following equation: 60 40 (3) where: 20 TA is the ambient temperature. PD is the power dissipation in the die, given by PD = [(VIN - VOUT) x ILOAD] + (VIN x IGND) 80 0 0.5 1.0 30mA 80mA 1.5 2.0 100mA 200mA 2.5 3.0 300mA (LOAD CURRENT) 3.5 4.0 4.5 5.0 5.0 VIN - VOUT (V) (4) Figure 34. 100 mm2 of PCB Copper, TA = 25C where: 140 ILOAD is the load current. IGND is the ground current. VIN and VOUT are input voltage and output voltage, respectively. MAX TJ (DO NOT OPERATE ABOVE THIS POINT) 120 100 TJ (C) Power dissipation due to ground current is quite small and can be ignored. Therefore, the junction temperature equation simplifies to the following: TJ = TA + {[(VIN - VOUT) x ILOAD] x JA} 1mA 10mA 06455-030 TJ = TA + (PD x JA) TJ (C) 1 2.5 300mA (LOAD CURRENT) 06455-031 Copper Size (mm2) 01 50 100 300 500 100mA 200mA 06455-029 To guarantee reliable operation, the junction temperature of the ADP1712/ADP1713/ADP1714 must not exceed 125C. To ensure the junction temperature stays below this maximum value, the user needs to be aware of the parameters that contribute to junction temperature changes. These parameters include ambient temperature, power dissipation in the power device, and thermal resistances between the junction and ambient air (JA). The JA number is dependent on the package assembly compounds used and the amount of copper to which the GND pin of the package is soldered on the PCB. Table 5 shows typical JA values of the 5lead TSOT package for various PCB copper sizes. (5) As shown in Equation 4, for a given ambient temperature, inputto-output voltage differential, and continuous load current, there exists a minimum copper size requirement for the PCB to ensure the junction temperature does not rise above 125C. The following figures show junction temperature calculations for different ambient temperatures, load currents, input-to-output voltage differentials, and areas of PCB copper. Rev. A | Page 13 of 16 80 60 40 20 0 0.5 1mA 10mA 1.0 30mA 80mA 1.5 2.0 100mA 200mA 2.5 3.0 300mA (LOAD CURRENT) 3.5 4.0 VIN - VOUT (V) Figure 35. 0 mm2 of PCB Copper, TA = 25C 4.5 ADP1712/ADP1713/ADP1714 PRINTED CIRCUIT BOARD LAYOUT CONSIDERATIONS 140 MAX TJ (DO NOT OPERATE ABOVE THIS POINT) 120 Heat dissipation from the package can be improved by increasing the amount of copper attached to the pins of the ADP1712/ ADP1713/ADP1714. However, as can be seen from Table 5, a point of diminishing returns eventually is reached, beyond which an increase in the copper size does not yield significant heat dissipation benefits. TJ (C) 100 80 60 40 20 1mA 10mA 1.0 30mA 80mA 1.5 2.0 100mA 200mA 2.5 3.0 300mA (LOAD CURRENT) 3.5 4.0 4.5 5.0 VIN - VOUT (V) 06455-032 0 0.5 Figure 36. 500 mm2 of PCB Copper, TA = 50C 140 MAX TJ (DO NOT OPERATE ABOVE THIS POINT) Place the input capacitor as close as possible to the IN and GND pins. Place the output capacitor as close as possible to the OUT and GND pins. For the ADP1712 adjustable version, place the soft-start capacitor as close as possible to the SS pin. For the ADP1713, place the internal reference bypass capacitor as close as possible to the BYP pin. Use of 0402 or 0603 size capacitors and resistors achieves the smallest possible footprint solution on boards where area is limited. GND (BOTTOM) 120 GND (TOP) TJ (C) 100 80 ADP1712/ ADP1713/ ADP1714 60 40 C1 C2 20 1.0 30mA 80mA 1.5 2.0 100mA 200mA 2.5 3.0 300mA (LOAD CURRENT) 3.5 4.0 4.5 5.0 VIN - VOUT (V) 06455-033 0 0.5 1mA 10mA IN OUT SS/ ADJ/ BYP/ TRK Figure 37. 100 mm2 of PCB Copper, TA = 50C 140 C3 MAX TJ (DO NOT OPERATE ABOVE THIS POINT) 120 R2 06455-035 80 Figure 39. Example PCB Layout 60 40 20 1mA 10mA 1.0 30mA 80mA 1.5 2.0 100mA 200mA 2.5 3.0 300mA (LOAD CURRENT) 3.5 4.0 VIN - VOUT (V) 4.5 5.0 06455-034 TJ (C) 100 0 0.5 R1 EN Figure 38. 0 mm2 of PCB Copper, TA = 50C Rev. A | Page 14 of 16 ADP1712/ADP1713/ADP1714 OUTLINE DIMENSIONS 2.90 BSC 5 4 2.80 BSC 1.60 BSC 1 2 3 0.95 BSC 1.90 BSC *1.00 MAX 0.10 MAX 0.50 0.30 0.20 0.08 SEATING PLANE 8 4 0 *COMPLIANT TO JEDEC STANDARDS MO-193-AB WITH THE EXCEPTION OF PACKAGE HEIGHT AND THICKNESS. 0.60 0.45 0.30 100708-A *0.90 MAX 0.70 MIN Figure 40. 5-Lead Thin Small Outline Transistor Package [TSOT] (UJ-5) Dimensions shown in millimeters ORDERING GUIDE Model ADP1712AUJZ-0.75R71 ADP1712AUJZ-0.8-R71 ADP1712AUJZ-0.85R71 ADP1712AUJZ-0.9-R71 ADP1712AUJZ-0.95R71 ADP1712AUJZ-1.0-R71 ADP1712AUJZ-1.05R71 ADP1712AUJZ-1.1-R71 ADP1712AUJZ-1.15R71 ADP1712AUJZ-1.2-R71 ADP1712AUJZ-1.3-R71 ADP1712AUJZ-1.5-R71 ADP1712AUJZ-1.8-R71 ADP1712AUJZ-2.5-R71 ADP1712AUJZ-3.0-R71 ADP1712AUJZ-3.3-R71 ADP1712AUJZ-R7 1 ADP1713AUJZ-0.75R71 ADP1713AUJZ-0.8-R71 ADP1713AUJZ-0.85R71 ADP1713AUJZ-0.9-R71 ADP1713AUJZ-0.95R71 ADP1713AUJZ-1.0-R71 ADP1713AUJZ-1.05R71 ADP1713AUJZ-1.1-R71 ADP1713AUJZ-1.15R71 ADP1713AUJZ-1.2-R71 Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C Output Voltage (V) 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.30 1.50 1.80 2.50 3.00 3.30 0.8 to 5 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 Package Description 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT Rev. A | Page 15 of 16 Package Option UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 Branding L3S L3T L3U L3V L3W L3X L3Y L3Z L4H L4J L4K L4L L4M L4N L4P L4Q L4R L4U L4V L4W L4X L4Y L4Z L50 L51 L52 L53 ADP1712/ADP1713/ADP1714 Model ADP1713AUJZ-1.3-R71 ADP1713AUJZ-1.5-R71 ADP1713AUJZ-1.8-R71 ADP1713AUJZ-2.5-R71 ADP1713AUJZ-3.0-R71 ADP1713AUJZ-3.3-R71 ADP1714AUJZ-0.75R71 ADP1714AUJZ-0.8-R71 ADP1714AUJZ-0.85R71 ADP1714AUJZ-0.9-R71 ADP1714AUJZ-0.95R71 ADP1714AUJZ-1.0-R71 ADP1714AUJZ-1.05R71 ADP1714AUJZ-1.1-R71 ADP1714AUJZ-1.15R71 ADP1714AUJZ-1.2-R71 ADP1714AUJZ-1.3-R71 ADP1714AUJZ-1.5-R71 ADP1714AUJZ-1.8-R71 ADP1714AUJZ-2.5-R71 ADP1714AUJZ-3.0-R71 ADP1714AUJZ-3.3-R71 ADP1712-3.3-EVALZ11 ADP1712-EVALZ11 Temperature Range -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C -40C to +125C Output Voltage (V) 1.30 1.50 1.80 2.50 3.00 3.30 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.30 1.50 1.80 2.50 3.00 3.30 3.3 ADP1713-3.3-EVALZ11 Adjustable, but set to 1.6 3.3 ADP1714-3.3-EVALZ11 3.3 1 Package Description 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT 5-Lead TSOT ADP1712 Fixed 3.3 V Output with Soft Start Evaluation Board ADP1712 Adjustable Output Evaluation Board ADP1713 Fixed 3.3 V Output with Bypass Evaluation Board ADP1714 Fixed 3.3 V Output with Track Mode Evaluation Board Z = RoHS Compliant Part. (c)2007-2009 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06455-0-6/09(A) Rev. A | Page 16 of 16 Package Option UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 UJ-5 Branding L54 L55 L56 L57 L58 L59 L5A L5C L5D L5E L5F L5G L5H L5J L5K L5L L5M L5N L5P L5Q L5R L5S