1 A, Low V , Low Noise, IN CMOS Linear Regulator Data Sheet ADP1761 FEATURES TYPICAL APPLICATION CIRCUITS ADP1761 1 A maximum output current V = 1.5V V = 1.7V IN OUT VIN VOUT Low input voltage supply range C C IN OUT 10F 10F SENSE V = 1.10 V to 1.98 V, no external bias supply required IN R ON PULL-UP Fixed output voltage range: V = 0.9 V to 1.5 V OUT FIXED 100k EN OFF PG PG Adjustable output voltage range: V = 0.5 V to 1.5 V OUT ADJ SS VADJ Ultralow noise: 2 V rms, 100 Hz to 100 kHz C SS VREG REFCAP Noise spectral density 10nF C C REF REG GND 1F 1F 4 nV/Hz at 10 kHz 3 nV/Hz at 100 kHz Figure 1. Fixed Output Operation Low dropout voltage: 30 mV typical at 1 A load ADP1761 V = 1.7V V = 1.5V Operating supply current: 4.5 mA typical at no load IN OUT VIN VOUT C C IN OUT 1.5% fixed output voltage accuracy over line, load, and 10F 10F SENSE temperature R PULL-UP ON 100k EN Excellent power supply rejection ratio (PSRR) performance OFF PG PG 67 dB typical at 10 kHz at 1 A load SS VADJ 51 dB typical at 100 kHz at 1 A load C SS VREG REFCAP R ADJ 10nF 10k C C REF REG Excellent load/line transient response GND 1F 1F Soft start to reduce inrush current Figure 2. Adjustable Output Operation Optimized for small 10 F ceramic capacitors Current-limit and thermal overload protection Table 1. Related Devices Power-good indicator Input Maximum Fixed/ Precision enable Device Voltage Current Adjustable Package 16-lead, 3 mm 3 mm LFCSP package ADP1762 1.10 V to 2 A Fixed/adjustable 16-lead 1.98 V LFCSP APPLICATIONS ADP1763 1.10 V to 3 A Fixed/adjustable 16-lead Regulation to noise sensitive applications such as radio 1.98 V LFCSP frequency (RF) transceivers, analog-to-digital converter ADP1740/ 1.6 V to 16-lead 2 A Fixed/adjustable (ADC) and digital-to-analog converter (DAC) circuits, ADP1741 3.6 V LFCSP phase-locked loops (PLLs), voltage controlled oscillators ADP1752/ 1.6 V to 0.8 A Fixed/adjustable 16-lead (VCOs) and clocking integrated circuits ADP1753 3.6 V LFCSP Field-programmable gate array (FPGA) and digital signal ADP1754/ 1.6 V to 1.2 A Fixed/adjustable 16-lead ADP1755 3.6 V LFCSP processor (DSP) supplies Medical and healthcare Industrial and instrumentation The ADP1761 delivers optimal transient performance with GENERAL DESCRIPTION minimal board area. The ADP1761 is a low noise, low dropout (LDO) linear regulator. The ADP1761 is available in fixed output voltages ranging from It is designed to operate from a single input supply with an input 0.9 V to 1.5 V. The output of the adjustable output model can voltage as low as 1.10 V, without the requirement of an external be set from 0.5 V to 1.5 V through an external resistor connected bias supply to increase efficiency and provide up to 1 A of output current. between VADJ and ground. The low 30 mV typical dropout voltage at a 1 A load allows the The ADP1761 has an externally programmable soft start time by ADP1761 to operate with a small headroom while maintaining connecting a capacitor to the SS pin. Short-circuit and thermal regulation and providing better efficiency. The ADP1761 is overload protection circuits prevent damage in adverse conditions. The ADP1761 is available in a small 16-lead LFCSP package for optimized for stable operation with small 10 F ceramic output the smallest footprint solution to meet a variety of applications. capacitors. Rev. C 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. Tel: 781.329.4700 20162020 Analog Devices, Inc. All rights reserved. No license is granted by implication or otherwise under any patent or patent rights of Analog Technical Support www.analog.com Devices. Trademarks and registered trademarks are the property of their respective owners. 12919-001 12919-002ADP1761 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Soft Start Function ..................................................................... 11 Applications ...................................................................................... 1 Adjustable Output Voltage ....................................................... 12 Typical Application Circuits ........................................................... 1 Enable Feature ............................................................................ 12 General Description ......................................................................... 1 Power-Good (PG) Feature ........................................................ 12 Revision History ............................................................................... 2 Applications Information ............................................................. 13 Specifications .................................................................................... 3 Capacitor Selection .................................................................... 13 Input and Output Capacitor: Recommended Specifications . 4 Undervoltage Lockout ............................................................... 14 Absolute Maximum Ratings ........................................................... 5 Current-Limit and Thermal Overload Protection ................ 14 Thermal Data ................................................................................ 5 Thermal Considerations ........................................................... 14 Thermal Resistance/Parameter .................................................. 5 PCB Layout Considerations ..................................................... 17 ESD Caution.................................................................................. 5 Outline Dimensions ....................................................................... 18 Pin Configuration and Function Descriptions ............................ 6 Ordering Guide .......................................................................... 18 Typical Performance Characteristics ............................................. 7 Theory of Operation ...................................................................... 11 REVISION HISTORY 3/2020Rev. B to Rev. C 9/2016Rev. 0 to Rev. A Changes to Thermal Data Section, Thermal Changes to Figure 23 and Figure 24 ............................................ 11 Resistance/Parameter Section, and Table 5 .................................. 5 4/2016Revision 0: Initial Version 8/2019Rev. A to Rev. B Change to Undervoltage Lockout, Hysteresis Parameter ........... 4 Updated Outline Dimensions ....................................................... 18 Rev. C Page 2 of 18