2 A, Low V , Low Dropout IN Linear Regulator Data Sheet ADP1740/ADP1741 FEATURES TYPICAL APPLICATION CIRCUITS V = 1.8V V = 1.5V IN OUT Maximum output current: 2 A Input voltage range: 1.6 V to 3.6 V 4.7F 4.7F Low shutdown current: 2 A 16 15 14 13 VIN VIN VOUT VOUT Low dropout voltage: 160 mV at 2 A load 1 VIN VOUT 12 Initial accuracy: 1% Accuracy over line, load, and temperature: 2% ADP1740 2 VIN VOUT 11 100k TOP VIEW 7 fixed output voltage options with soft start: (Not to Scale) 3 VIN VOUT 10 0.75 V to 2.5 V (ADP1740) PG Adjustable output voltage options with soft start: 4 EN SENSE 9 0.75 V to 3.3 V (ADP1741) PG GND SS NC 8 5 6 7 High PSRR 65 dB at 1 kHz 10nF 65 dB at 10 kHz 54 dB at 100 kHz Figure 1. ADP1740 with Fixed Output Voltage, 1.5 V 23 V rms at 0.75 V output V = 1.8V V = 0.5V(1 + R1/R2) IN OUT Stable with small 4.7 F ceramic output capacitor Excellent load and line transient response 4.7F 4.7F Current-limit and thermal overload protection 13 16 15 14 VIN VIN VOUT VOUT Power-good indicator 1 VIN VOUT 12 Logic-controlled enable Reverse current protection ADP1741 100k 2 VIN VOUT 11 TOP VIEW (Not to Scale) APPLICATIONS 3 VIN VOUT 10 R1 PG Server computers 4 EN ADJ 9 PG GND SS NC Memory components R2 5 6 7 8 Telecommunications equipment Network equipment 10nF DSP/FPGA/microprocessor supplies Instrumentation equipment/data acquisition systems Figure 2. ADP1741 with Adjustable Output Voltage, 0.75 V to 3.3 V GENERAL DESCRIPTION voltages ranging from 0.75 V to 3.3 V via an external divider. The ADP1740/ADP1741 are low dropout (LDO) CMOS linear The ADP1740/ADP1741 allow an external soft start capacitor regulators that operate from 1.6 V to 3.6 V and provide up to 2 A to be connected to program the startup. A digital power-good of output current. These low VIN/VOUT LDOs are ideal for regu- output allows power system monitors to check the health of the lation of nanometer FPGA geometries operating from 2.5 V down output voltage. to 1.8 V I/O rails, and for powering core voltages down to 0.75 V. Using an advanced, proprietary architecture, the ADP1740/ The ADP1740/ADP1741 are available in a 16-lead, 4 mm ADP1741 provide high power supply rejection ratio (PSRR) and 4 mm LFCSP, making them not only very compact solutions, low noise, and achieve excellent line and load transient response but also providing excellent thermal performance for applica- with only a small 4.7 F ceramic output capacitor. tions that require up to 2 A of output current in a small, low profile footprint. The ADP1740 is available in seven fixed output voltage options. The ADP1741 is an adjustable version that allows output Rev. H Document Feedback 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 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20082015 Analog Devices, Inc. All rights reserved. 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. Technical Support www.analog.com 07081-001 07081-002ADP1740/ADP1741 Data Sheet TABLE OF CONTENTS Soft Start Function ..................................................................... 11 Features .............................................................................................. 1 Adjustable Output Voltage (ADP1741) ................................... 12 Applications ....................................................................................... 1 Enable Feature ............................................................................ 12 Typical Application Circuits ............................................................ 1 Power-Good Feature .................................................................. 12 General Description ......................................................................... 1 Reverse Current Protection Feature ........................................ 13 Revision History ............................................................................... 2 Applications Information .............................................................. 14 Specifications ..................................................................................... 3 Capacitor Selection .................................................................... 14 Input and Output Capacitor, Recommended Specifications .. 4 Undervoltage Lockout ............................................................... 15 Absolute Maximum Ratings ............................................................ 5 Current-Limit and Thermal Overload Protection ................. 15 Thermal Data ................................................................................ 5 Thermal Considerations ............................................................ 15 Thermal Resistance ...................................................................... 5 PCB Layout Considerations ...................................................... 17 ESD Caution .................................................................................. 5 Outline Dimensions ....................................................................... 19 Pin Configurations and Function Descriptions ........................... 6 Ordering Guide .......................................................................... 19 Typical Performance Characteristics ............................................. 7 Theory of Operation ...................................................................... 11 REVISION HISTORY 1/15Rev. G to Rev. H Changes to Ordering Guide .......................................................... 19 4/14Rev. F to Rev. G Changes to Figure 1 and Figure 2 ................................................... 1 Changes to Figure 3 and Figure 4 ................................................... 6 Updated Outline Dimensions ....................................................... 19 Changes to Ordering Guide .......................................................... 19 8/13Rev. E to Rev. F Changes to Ordering Guide .......................................................... 19 6/13Rev. D to Rev. E Changed Adjustable Output Voltage Option with Soft Start (ADP1755) from 0.75 V to 3.0 V to 0.75 V to 3.3 V (Throughout) .................................................................................... 1 Updated Outline Dimensions ....................................................... 19 12/12Rev. C to Rev. D Added Junction Temperature of 150C, Table 3 ........................... 5 Changes to Ordering Guide .......................................................... 19 9/12Rev. B to Rev. C Changes to Table 3 ............................................................................ 5 Changes to Ordering Guide .......................................................... 19 2/10Rev. A to Rev. B Changes to Table 4 ............................................................................ 5 Changes to Ordering Guide .......................................................... 19 4/09Rev. 0 to Rev. A Changes to Table 3 ............................................................................ 5 10/08Revision 0: Initial Version Rev. H Page 2 of 20