50 mA, High Voltage, Micropower Linear Regulator ADP1720 APPLICATIONS TYPICAL APPLICATION CIRCUITS ADP1720 FIXED VIN = 28V 1F 1 GND GND 8 2 IN GND 7 3 OUT GND 6 4 EN GND 5 VOUT = 5V 06111-001 Wide input voltage range: 4 V to 28 V Maximum output current: 50 mA Low light load current: 28 A at 0 A load 35 A at 100 A load Low shutdown current: 0.7 A Low dropout voltage: 275 mV @ 50 mA load Initial accuracy: 0.5% Accuracy over line, load, and temperature: 2% Stable with small 1F ceramic output capacitor Fixed 3.3 V and 5.0 V output voltage options Adjustable output voltage option: 1.225 V to 5.0 V Current limit and thermal overload protection Logic controlled enable Space-saving thermally enhanced MSOP package 1F Figure 1. ADP1720 with Fixed Output Voltage, 5.0 V ADP1720 R2 R1 VIN = 12V 1F VOUT = 1.225V(1 + R1/R2) 1F ADJUSTABLE 1 ADJ GND 8 2 IN GND 7 3 OUT GND 6 4 EN GND 5 06111-002 FEATURES Figure 2. ADP1720 with Adjustable Output Voltage, 1.225 V to 5.0 V DC-to-DC post regulation PCMCIA regulation Keep-alive power in portable equipment Industrial applications GENERAL DESCRIPTION The ADP1720 is a high voltage, micropower, low dropout linear regulator. Operating over a very wide input voltage range of 4 V to 28 V, the ADP1720 can provide up to 50 mA of output current. With just 28 A of quiescent supply current and a micropower shutdown mode, this device is ideal for applications that require low quiescent current. The ADP1720 is optimized for stable operation with small 1 F ceramic output capacitors, allowing for good transient performance while occupying minimal board space. The ADP1720 is available in fixed output voltages of 3.3 V and 5.0 V. An adjustable version is also available, which allows the output to be set anywhere between 1.225 V and 5.0 V. An enable function that allows external circuits to turn on and turn off the ADP1720 output is available. For automatic startup, the enable (EN) pin can be connected directly to the input rail. Available in a small thermally enhanced MSOP package, the ADP1720 provides a compact solution with low thermal resistance. The ADP1720 operates from -40C to +125C and uses current limit protection and thermal overload protection circuits to prevent damage to the device 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 Analog Devices, Inc. All rights reserved. ADP1720 TABLE OF CONTENTS Features .............................................................................................. 1 Typical Performance Characteristics ..............................................7 Applications ....................................................................................... 1 Theory of Operation ...................................................................... 10 Typical Application Circuits............................................................ 1 Adjustable Output Voltage (ADP1720 Adjustable) ............... 10 General Description ......................................................................... 1 Applications Information .............................................................. 11 Revision History ............................................................................... 2 Capacitor Selection .................................................................... 11 Specifications..................................................................................... 3 Current Limit and Thermal Overload Protection ................. 11 Absolute Maximum Ratings............................................................ 5 Thermal Considerations............................................................ 12 Thermal Resistance ...................................................................... 5 Printed Circuit Board Layout Considerations ....................... 14 ESD Caution .................................................................................. 5 Outline Dimensions ....................................................................... 15 Pin Configurations and Function Descriptions ........................... 6 Ordering Guide .......................................................................... 15 REVISION HISTORY 7/07--Rev. 0 to Rev. A Change to Figure 1 ........................................................................... 1 Changes to Table 1 ............................................................................ 3 Changes to Ordering Guide .......................................................... 15 2/07--Revision 0: Initial Version Rev. A | Page 2 of 16 ADP1720 SPECIFICATIONS VIN = 12 V, IOUT = 100 A, CIN = COUT = 1 F, TA = 25C, unless otherwise noted. Table 1. Parameter INPUT VOLTAGE RANGE OPERATING SUPPLY CURRENT SHUTDOWN CURRENT OUTPUT Fixed Output Voltage Accuracy Symbol VIN IGND IGND-SD VOUT Adjustable Output 1 Voltage Accuracy VOUT Noise (10 Hz to 100 kHz) OUTNOISE REGULATION Line Regulation Load Regulation 2 VOUT/VIN VOUT/IOUT DROPOUT VOLTAGE 3 VDROPOUT START-UP TIME 4 CURRENT LIMIT THRESHOLD 5 THERMAL CHARACTERISTICS Thermal Shutdown Threshold Thermal Shutdown Hysteresis EN CHARACTERISTICS EN Input Logic High Logic Low Leakage Current ADJ INPUT BIAS CURRENT (ADP1720 ADJUSTABLE) Conditions TJ = -40C to +125C IOUT = 0 A IOUT = 0 A, VIN = VOUT + 0.5 V or 4 V (whichever is greater), TJ = -40C to +125C IOUT = 100 A IOUT = 100 A, VIN = VOUT + 0.5 V or 4 V (whichever is greater), TJ = -40C to +125C IOUT = 1 mA IOUT = 1 mA, VIN = VOUT + 0.5 V or 4 V (whichever is greater), TJ = -40C to +125C IOUT = 10 mA IOUT = 10 mA, VIN = VOUT + 0.5 V or 4 V (whichever is greater), TJ = -40C to +125C 100 A < IOUT < 50 mA, VIN = VOUT + 0.5 V or 4 V (whichever is greater), TJ = -40C to +125C EN = GND EN = GND, TJ = -40C to +125C Min 4 IOUT = 100 A 100 A < IOUT < 50 mA 100 A < IOUT < 50 mA, TJ = -40C to +125C IOUT = 100 A 100 A < IOUT < 50 mA 100 A < IOUT < 50 mA, TJ = -40C to +125C VOUT = 1.6 V, COUT = 1 F VOUT = 1.6 V, COUT = 10 F VOUT = 5 V, COUT = 1 F VOUT = 5 V, COUT = 10 F -0.5 -1 -2 1.2188 1.2127 1.2005 VIN = (VOUT + 0.5 V) to 28 V, TJ = -40C to +125C 1 mA < IOUT < 50 mA 1 mA < IOUT < 50 mA, TJ = -40C to +125C IOUT = 10 mA IOUT = 10 mA, TJ = -40C to +125C IOUT = 50 mA IOUT = 50 mA, TJ = -40C to +125C -0.02 TSTART-UP ILIMIT TSSD Rev. A | Page 3 of 16 120 A A 340 A A 900 A A 2115 A 1.5 A A 74 300 1185 0.7 1.2250 +0.5 +1 +2 1.2311 1.2372 1.2495 146 124 340 266 +0.02 0.001 0.005 55 105 275 480 TJ rising ADJI-BIAS 80 Unit V A A 35 55 4 V VIN 28 V 4 V VIN 28 V EN = GND EN = IN Max 28 28 TSSD-HYS VIH VIL VI-LEAKAGE Typ 200 90 140 % % % V V V V V V V %/ V %/mA %/mA mV mV mV mV s mA 150 C 15 C 1.8 0.1 0.5 30 0.4 1 1 100 rms rms rms rms V V A A nA ADP1720 Parameter POWER SUPPLY REJECTION RATIO Symbol PSRR Conditions f = 120 Hz, VIN = 8 V, VOUT = 1.6 V f = 1 kHz, VIN = 8 V, VOUT = 1.6 V f = 10 kHz, VIN = 8 V, VOUT = 1.6 V f = 120 Hz, VIN = 8 V, VOUT = 5 V f = 1 kHz, VIN = 8 V, VOUT = 5 V f = 10 kHz, VIN = 8 V, VOUT = 5 V 1 Min Typ -90 -80 -60 -83 -70 -50 Max Unit dB dB dB dB dB dB 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 1 mA and 50 mA loads. See Figure 6 for typical load regulation performance for loads less than 1 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 4 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 5.0 V output voltage is defined as the current that causes the output voltage to drop to 90% of 5.0 V, or 4.5 V. Rev. A | Page 4 of 16 ADP1720 ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Table 2. Parameter IN to GND OUT to GND EN to GND ADJ to GND Storage Temperature Range Operating Junction Temperature Range Soldering Conditions Rating -0.3 V to +30 V -0.3 V to IN or +6 V (whichever is less) -0.3 V to +30 V -0.3 V to +6 V -65C to +150C -40C to +125C 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 8-Lead MSOP ESD CAUTION JEDEC J-STD-020 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 118 JC 57 Unit C/W ADP1720 IN 2 OUT 3 EN 4 ADP1720 FIXED TOP VIEW (Not to Scale) 8 GND ADJ 1 7 GND IN 2 6 GND OUT 3 5 GND 06111-003 GND 1 EN 4 Figure 3. 8-Lead MSOP ADP1720 ADJUSTABLE TOP VIEW (Not to Scale) 8 GND 7 GND 6 GND 5 GND 06111-004 PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS Figure 4. 8-Lead MSOP Table 4. Pin Function Descriptions ADP1720 Fixed Pin No. 1 N/A 2 3 4 ADP1720 Adjustable Pin No. N/A 1 2 3 4 Mnemonic GND ADJ IN OUT EN 5 6 7 8 5 6 7 8 GND GND GND GND Description This pin is internally connected to ground. Adjust. A resistor divider from OUT to ADJ sets the output voltage. Regulator Input Supply. Bypass IN to GND with a 1 F or greater capacitor. Regulated Output Voltage. Bypass OUT to GND with a 1 F or greater capacitor. 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. Ground. Ground. Ground. Ground. Rev. A | Page 6 of 16 ADP1720 TYPICAL PERFORMANCE CHARACTERISTICS VIN = 12 V, VOUT = 5 V, IOUT = 100 A, CIN = COUT = 1 F, TA = 25C, unless otherwise noted. 1200 5.03 5.02 1000 ILOAD = 50mA ILOAD = 25mA ILOAD = 10mA 5.01 IGND (A) 5.00 4.99 200 4.96 -40 -5 600 25 85 06111-008 4.97 ILOAD = 1mA ILOAD = 100A ILOAD = 10A 400 ILOAD = 10A ILOAD = 100A ILOAD = 1mA ILOAD = 10mA ILOAD = 25mA ILOAD = 50mA 4.98 06111-005 VOUT (V) 800 0 -40 125 -5 25 85 125 TJ (C) TJ (C) Figure 5. Output Voltage vs. Junction Temperature Figure 8. Ground Current vs. Junction Temperature 5.0015 1200 5.0010 1000 5.0005 800 4.9995 IGND (A) 4.9990 4.9985 600 400 4.9980 4.9975 06111-006 200 4.9970 4.9965 0.01 0.1 1 10 06111-009 VOUT (V) 5.0000 0 0.01 100 0.1 1 Figure 6. Output Voltage vs. Load Current Figure 9. Ground Current vs. Load Current 5.010 1400 ILOAD = 10A ILOAD = 100A ILOAD = 1mA ILOAD = 10mA ILOAD = 25mA ILOAD = 50mA 5.008 5.006 5.004 ILOAD = 50mA ILOAD = 25mA ILOAD = 10mA 1200 ILOAD = 1mA ILOAD = 100A ILOAD = 10A 1000 IGND (A) 5.002 5.000 4.998 4.996 800 600 400 4.994 4.992 4.990 0 5 10 15 20 25 06111-010 200 06111-007 VOUT (V) 100 10 ILOAD (mA) ILOAD (mA) 0 0 30 5 10 15 20 25 VIN (V) VIN (V) Figure 7. Output Voltage vs. Input Voltage Figure 10. Ground Current vs. Input Voltage Rev. A | Page 7 of 16 30 ADP1720 3.5 300 3.0 250 ILOAD = 50mA 200 IGND (mA) VDROPOUT (mV) 2.5 150 2.0 ILOAD = 25mA 1.5 100 ILOAD = 10mA 1.0 06111-011 0.5 0 1 0 4.9 100 10 ILOAD = 1mA 06111-013 50 5.0 5.1 Figure 11. Dropout Voltage vs. Load Current 5.3 5.4 Figure 13. Ground Current vs. Input Voltage (in Dropout) 5.05 0 ILOAD = 1mA 5.00 -10 4.95 -20 VIN = 8V VOUT = 1.6V COUT = 1F VRIPPLE = 50mV -30 4.90 1mA PSRR (dB) ILOAD = 50mA 4.85 ILOAD = 25mA 4.80 ILOAD = 10mA -40 10mA -50 100A -60 4.75 -70 4.70 4.65 4.60 4.9 5.0 5.1 5.2 5.3 06111-014 -80 06111-012 VOUT (V) 5.2 VIN (V) ILOAD (mA) -90 -100 10 5.4 VIN (V) 100 1k 10k 100k 1M FREQUENCY (Hz) Figure 12. Output Voltage vs. Input Voltage (in Dropout) Figure 14. Power Supply Rejection Ratio vs. Frequency (1.6 V Adjustable Output) Rev. A | Page 8 of 16 10M ADP1720 0 VIN = 8V VOUT = 5V COUT = 1F VRIPPLE = 50mV -10 -20 VIN STEP FROM 6V TO 7V -30 VOUT = 5V CIN = 1F COUT = 1F ILOAD = 50mA 10mA -50 -60 100A 2V/DIV 1mA 1 10mV/DIV 2 -70 -90 -100 10 100 1k 10k 100k 1M VOUT 06111-017 06111-015 -80 10M TIME (100s/DIV) FREQUENCY (Hz) Figure 15. Power Supply Rejection Ratio vs. Frequency (5.0 V Fixed Output) Figure 17. Line Transient Response 5V/DIV EN 1 VOUT 1 2V/DIV VOUT 06111-016 10mV/DIV VIN = 12V VOUT = 1.6V CIN = 1F COUT = 1F LOAD STEP FROM 2.5mA TO 47.5mA TIME (20s/DIV) VIN = 12V VOUT = 5V CIN = 1F COUT = 1F ILOAD = 50mA 2 TIME (40s/DIV) Figure 16. Load Transient Response Figure 18. Start-Up Time Rev. A | Page 9 of 16 06111-018 PSRR (dB) -40 ADP1720 THEORY OF OPERATION The ADP1720 is a low dropout, BiCDMOS linear regulator that operates from a 4 V to 28 V input rail and provides up to 50 mA of output current. Ground current in shutdown mode is typically 700 nA. The ADP1720 is stable and provides high power supply rejection ratio (PSRR) and excellent line and load transient response with just a small 1 F ceramic output capacitor. ADJUSTABLE OUTPUT VOLTAGE (ADP1720 ADJUSTABLE) The ADP1720 adjustable version can have its output voltage set over a 1.225 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 = 1.225 V (1 + R1/R2) IN OUT where: R1 is the resistor from OUT to ADJ. R2 is the resistor from ADJ to GND. CURRENT LIMIT THERMAL PROTECT To make calculation of R1 and R2 easier, Equation 1 can be rearranged as follows: SHUTDOWN R1 = R2 [(VOUT /1.225) - 1] GND/ADJ REFERENCE GND 06111-019 EN (1) (2) The maximum bias current into ADJ is 100 nA; therefore, when less than 0.5% error is due to the bias current, use values less than 60 k for R2. Figure 19. Internal Block Diagram Internally, the ADP1720 consists of a reference, an error amplifier, a feedback voltage divider, and a DMOS pass transistor. Output current is delivered via the DMOS 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 DMOS device is pulled lower, allowing more current to pass and increasing the output voltage. If the feedback voltage is higher than the reference voltage, the gate of the PNP device is pulled higher, allowing less current to pass and decreasing the output voltage. The ADP1720 is available in two versions, one with fixed output voltage options (see Figure 1) and one with an adjustable output voltage (see Figure 2). The fixed output voltage options are set internally to either 5.0 V or 3.3 V, using an internal feedback network. The adjustable output voltage can be set to between 1.225 V and 5.0 V by an external voltage divider connected from OUT to ADJ. The ADP1720 uses the EN pin to enable and disable the OUT pin under normal operating conditions. When EN is high, OUT turns on; when EN is low, OUT turns off. For automatic startup, EN can be tied to IN. Rev. A | Page 10 of 16 ADP1720 APPLICATIONS INFORMATION CAPACITOR SELECTION Input and Output Capacitor Properties Output Capacitor Any good quality ceramic capacitors can be used with the ADP1720, 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 for the output capacitor. X5R or X7R dielectrics with a voltage rating of 50 V or higher are recommended for the input capacitor. The ADP1720 is designed for operation with small, space-saving ceramic capacitors, but it functionswith 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 1 F capacitance with an ESR of 500 m or less is recommended to ensure stability of the ADP1720. 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 ADP1720 to large changes in load current. Figure 20 and Figure 21 show the transient responses for output capacitance values of 1 F and 10 F, respectively. CURRENT LIMIT AND THERMAL OVERLOAD PROTECTION Current limit and thermal overload protection circuits on the ADP1720 protect the part from damage caused by excessive power dissipation. The ADP1720 is designed to current limit when the output load reaches 90 mA (typical). When the output load exceeds 90 mA, the output voltage is reduced to maintain a constant current limit. 1 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, the output is turned on again, and output current is restored to its nominal value. 06111-020 10mV/DIV VIN = 12V VOUT = 1.6V CIN = 1F COUT = 1F LOAD STEP FROM 2.5mA TO 47.5mA TIME (2s/DIV) Figure 20. Output Transient Response, 1 F VIN = 12V VOUT = 1.6V CIN = 10F COUT = 10F LOAD STEP FROM 2.5mA TO 47.5mA Consider the case where a hard short from OUT to GND occurs. At first, the ADP1720 current limits so that only 90 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 90 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 90 mA and 0 mA, which continues as long as the short remains at the output. 1 06111-021 10mV/DIV Y5V and Z5U dielectrics are not recommended, due to their poor temperature and dc bias characteristics. TIME (2s/DIV) Figure 21. Output Transient Response, 10 F Input Bypass Capacitor Connecting a 1 F capacitor from IN to GND reduces the circuit sensitivity to printed circuit board (PCB) layout, especially when encountering long input traces or high source impedance. If greater than 1 F of output capacitance is required, it is recommended that the input capacitor be increased to match it. Current and thermal limit protections are intended to protect the device against accidental overload conditions. For reliable operation, device power dissipation must be externally limited so that junction temperatures do not exceed 125C. Rev. A | Page 11 of 16 ADP1720 THERMAL CONSIDERATIONS 140 MAX TJ (DO NOT OPERATE ABOVE THIS POINT) 120 100 TJ (C) 80 60 40 20 1mA 5mA 10mA 20mA 0 4 8 Table 5. 12 16 20 24 28 VIN - VOUT (V) JA (C/W) 118 99 77 75 74 Figure 22. 300 mm2 of PCB Copper, TA = 25C 140 MAX TJ (DO NOT OPERATE ABOVE THIS POINT) 120 100 Device soldered to minimum size pin traces. TJ (C) The junction temperature of the ADP1720 can be calculated from the following equation: TJ = TA + (PD x JA) (3) 60 40 where: TA is the ambient temperature. PD is the power dissipation in the die, given by 20 1mA 5mA 10mA 20mA 30mA 40mA 50mA (LOAD CURRENT) 0 0 PD = [(VIN - VOUT) x ILOAD] + (VIN x IGND) 4 8 (4) 12 16 20 24 28 VIN - VOUT (V) Figure 23. 100 mm2 of PCB Copper, TA = 25C where: ILOAD is the load current. IGND is the ground current. VIN and VOUT are input and output voltages, respectively. 140 MAX TJ (DO NOT OPERATE ABOVE THIS POINT) 120 Power dissipation due to ground current is quite small and can be ignored. Therefore, the junction temperature equation simplifies to the following: 100 (5) As shown in Equation 5, for a given ambient temperature, input-to-output voltage differential, and continuous load current, there exists a minimum copper size requirement for the PCB to ensure that the junction temperature does not rise above 125C. Figure 22 to Figure 27 show junction temperature calculations for different ambient temperatures, load currents, VIN to VOUT differentials, and areas of PCB copper. Rev. A | Page 12 of 16 TJ (C) TJ = TA + {[(VIN - VOUT) x ILOAD] x JA} 80 06111-023 1 50mA (LOAD CURRENT) 80 60 40 20 1mA 5mA 10mA 20mA 30mA 40mA 50mA (LOAD CURRENT) 0 0 4 8 12 16 20 VIN - VOUT (V) Figure 24. 0 mm2 of PCB Copper, TA = 25C 24 06111-024 Copper Size (mm2) 01 50 100 300 500 30mA 40mA 0 06111-022 To guarantee reliable operation, the junction temperature of the ADP1720 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 pins of the package are soldered on the PCB. Table 5 shows typical JA values of the 8-lead MSOP package for various PCB copper sizes. 28 ADP1720 140 140 MAX TJ (DO NOT OPERATE ABOVE THIS POINT) 120 120 100 100 80 80 TJ (C) 60 40 40 1mA 5mA 10mA 20mA 30mA 40mA 50mA (LOAD CURRENT) 0 0 4 8 12 16 20 24 20 06111-025 20 1mA 5mA 28 0 MAX TJ (DO NOT OPERATE ABOVE THIS POINT) 120 100 80 60 20 50mA (LOAD CURRENT) 0 0 4 8 12 16 20 24 06111-026 40 30mA 40mA 50mA (LOAD CURRENT) 4 8 12 16 20 Figure 27. 0 mm2 of PCB Copper, TA = 50C 140 10mA 20mA 30mA 40mA VIN - VOUT (V) Figure 25. 300 mm2 of PCB Copper, TA = 50C 1mA 5mA 10mA 20mA 0 VIN - VOUT (V) TJ (C) 60 28 VIN - VOUT (V) Figure 26. 100 mm2 of PCB Copper, TA = 50C Rev. A | Page 13 of 16 24 06111-027 TJ (C) MAX TJ (DO NOT OPERATE ABOVE THIS POINT) 28 ADP1720 PRINTED CIRCUIT BOARD LAYOUT CONSIDERATIONS GND (TOP) 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. Use of 0402 or 0603 size capacitors and resistors achieves the smallest possible footprint solution on boards where area is limited. ADP1720 C1 C2 IN OUT R1 R2 EN GND (BOTTOM) Figure 28. Example PCB Layout Rev. A | Page 14 of 16 06111-028 Heat dissipation from the package can be improved by increasing the amount of copper attached to the pins of the ADP1720. 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. ADP1720 OUTLINE DIMENSIONS 3.20 3.00 2.80 8 3.20 3.00 2.80 1 5 5.15 4.90 4.65 4 PIN 1 0.65 BSC 0.95 0.85 0.75 1.10 MAX 0.15 0.00 0.38 0.22 COPLANARITY 0.10 8 0 0.23 0.08 0.80 0.60 0.40 SEATING PLANE COMPLIANT TO JEDEC STANDARDS MO-187-AA Figure 29. 8-Lead Mini Small Outline Package [MSOP] (RM-8) Dimensions shown in millimeters ORDERING GUIDE Model ADP1720ARMZ-5-R7 1 ADP1720ARMZ-3.3-R71 ADP1720ARMZ-R71 ADP1720-5-EVALZ1 ADP1720-3.3-EVALZ1 ADP1720-EVALZ1 1 Temperature Range -40C to +125C -40C to +125C -40C to +125C Output Voltage (V) 5 3.3 1.225 to 5 5 3.3 1.225 to 5 Package Description 8-Lead MSOP 8-Lead MSOP 8-Lead MSOP Evaluation Board Evaluation Board Evaluation Board Z = RoHS Compliant Part. Rev. A | Page 15 of 16 Package Option RM-8 RM-8 RM-8 Branding L30 L2Z L2M ADP1720 NOTES (c)2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06111-0-7/07(A) Rev. A | Page 16 of 16