1.2 A, Low V , Low Dropout IN Linear Regulator Data Sheet ADP1754/ADP1755 FEATURES TYPICAL APPLICATION CIRCUITS V = 1.8V V = 1.5V IN OUT Maximum output current: 1.2 A Input voltage range: 1.6 V to 3.6 V 4.7F 4.7F Low shutdown current: <2 A 13 16 15 14 VIN VIN VOUT VOUT Very low dropout voltage: 105 mV at 1.2 A load 1 VIN VOUT 12 Initial accuracy: 1% Accuracy over line, load, and temperature: 2% 2 VIN VOUT 11 100k ADP1754 7 fixed output voltage options with soft start TOP VIEW 3 VIN (Not to Scale) VOUT 10 0.75 V to 2.5 V (ADP1754) PG Adjustable output voltage option with soft start 4 EN SENSE 9 0.75 V to 3.3 V (ADP1755) PG GND SS NC 5 6 7 8 High PSRR 65 dB at 1 kHz 10nF 65 dB at 10 kHz 54 dB at 100 kHz Figure 1. ADP1754 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 13 16 15 14 Current-limit and thermal overload protection VIN VIN VOUT VOUT Power-good indicator 1 VIN VOUT 12 Logic-controlled enable 2 VIN VOUT 11 100k ADP1755 Reverse current protection TOP VIEW 3 VIN (Not to Scale) VOUT 10 R1 APPLICATIONS PG 4 EN ADJ 9 Server computers R2 PG GND SS NC Memory components 5 6 7 8 Telecommunications equipment 10nF Network equipment DSP/FPGA/microprocessor supplies Figure 2. ADP1755 with Adjustable Output Voltage, 0.75 V to 3.3 V Instrumentation equipment/data acquisition systems GENERAL DESCRIPTION voltages that range from 0.75 V to 3.3 V via an external divider. The ADP1754/ADP1755 are low dropout (LDO) CMOS linear The ADP1754/ADP1755 allow an external soft start capacitor regulators that operate from 1.6 V to 3.6 V and provide up to to be connected to program the startup. A digital power-good 1.2 A of output current. These low VIN/VOUT LDOs are ideal for output allows power system monitors to check the health of the regulation of nanometer FPGA geometries operating from 2.5 V output voltage. down to 1.8 V I/O rails, and for powering core voltages down to 0.75 V. Using an advanced proprietary architecture, the ADP1754/ The ADP1754/ADP1755 are available in a 16-lead, 4 mm 4 mm ADP1755 provide high power supply rejection ratio (PSRR) and LFCSP, making them not only very compact solutions, but also low noise, and achieve excellent line and load transient response providing excellent thermal performance for applications that with only a small 4.7 F ceramic output capacitor. require up to 1.2 A of output current in a small, low profile footprint. The ADP1754 is available in seven fixed output voltage options. The ADP1755 is the adjustable version, which allows output Rev. G 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 20082014 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Technical Support www.analog.com Trademarks and registered trademarks are the property of their respective owners. 07722-002 07722-001ADP1754/ADP1755 Data Sheet TABLE OF CONTENTS Soft Start Function (ADP1754/ADP1755) ............................. 11 Features .............................................................................................. 1 Adjustable Output Voltage (ADP1755) ................................... 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 ...................................................... 18 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 4/14Rev. F to Rev. G 4/09Rev. 0 to Rev. A Changes to Figure 1 and Figure 2 ................................................... 1 Changes to Adjustable Output Voltage Accuracy (ADP1755) Change to Table 4 ............................................................................. 5 Parameter, Table 1 ............................................................................. 3 Changes to Figure 3 and Figure 4 ................................................... 6 Changes to Table 3 ............................................................................. 5 Updated Outline Dimensions ....................................................... 19 10/08Revision 0: Initial Version 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 9/12Rev. B to Rev. C Changes to Absolute Maximum Ratings, Table 3......................... 5 Changes to Ordering Guide .......................................................... 19 2/10Rev. A to Rev. B Changes to Table 4 ............................................................................ 5 Changes to Ordering Guide .......................................................... 19 Rev. G Page 2 of 20