20 V, 500 mA, Low Noise LDO Regulator with Soft Start Data Sheet ADP7105 FEATURES TYPICAL APPLICATION CIRCUITS Input voltage range: 3.3 V to 20 V V = 8V VIN VOUT V = 5V OUT IN + + CIN COUT Maximum output current: 500 mA 1F 1F SENSE Low noise: 15 V rms for fixed output versions 100k PSRR performance of 60 dB at 10 kHz, V = 3.3 V ON OUT 100k EN/ OFF Reverse current protection UVLO PG PG 100k Low dropout voltage: 350 mV at 500 mA SS GND CSS Initial accuracy: 0.8% Accuracy over line, load, and temperature 2% to +1%, T = 40C to +125C Figure 1. ADP7105 with Fixed Output Voltage, 5 V J 1.25% to +1%, T = 0C to +85C J V = 5V V = 8V VIN VOUT IN OUT Low quiescent current: 900 A at V = 10 V, I = 500 mA + + IN OUT CIN COUT 40.2k 1F 1F Low shutdown current: <50 A at V = 12 V, stable with IN ADJ 13k small 1 F ceramic output capacitor ON 100k EN/ 100k 3 fixed output voltage options: 1.8, 3.3 V and 5 V OFF UVLO PG 100k PG Adjustable output from 1.22 V to 19 V SS GND Programmable soft start for inrush current control CSS Foldback current-limit and thermal overload protection User programmable precision UVLO/enable Figure 2. ADP7105 with Adjustable Output Voltage, 5 V Power-good indicator 8-lead LFCSP and 8-lead SOIC packages APPLICATIONS Regulation of noise sensitive applications: ADC and DAC circuits, precision amplifiers, high frequency oscillators, clocks, and PLLs Communications and infrastructure Medical and healthcare Industrial and instrumentation GENERAL DESCRIPTION The ADP7105 is a CMOS, low dropout (LDO) linear regulator Note that throughout this data sheet, the sense function (SENSE) of that operates from 3.3 V to 20 V and provides up to 500 mA of the SENSE/ADJ pin applies to fixed output voltage models only, output current. This high input voltage LDO is ideal for regula- whereas the adjust input function (ADJ) applies to adjustable tion of high performance analog and mixed-signal circuits output voltage models only. For example, Figure 1 shows the sense operating from 1.22 V to 19 V rails. Using an advanced proprietary function, and Figure 2 shows the adjust input function. architecture, the ADP7105 provides high power supply The ADP7105 output noise voltage is 15 V rms and is inde- rejection and low noise, and achieves excellent line and load pendent of the output voltage. A digital power-good output transient response with only a small 1 F ceramic output allows power system monitors to check the health of the output capacitor. voltage. A user programmable precision undervoltage lockout The ADP7105 is available in three fixed output voltage options function facilitates sequencing of multiple power supplies. and an adjustable version that allows output voltages ranging The ADP7105 is available in 8-lead, 3 mm 3 mm LFCSP and from 1.22 V to 19 V via an external feedback divider. The 8-lead SOIC packages. The LFCSP offers a very compact solution ADP7105 allows an external soft start capacitor to be connected and provides excellent thermal performance for applications that to program the startup. require up to 500 mA of output current in a small, low profile footprint. 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. No Tel: 781.329.4700 20132020 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 11641-002 11641-001ADP7105 Data Sheet TABLE OF CONTENTS Features .............................................................................................. 1 Theory of Operation ...................................................................... 17 Applications ....................................................................................... 1 Applications Information .............................................................. 18 Typical Application Circuits ............................................................ 1 Capacitor Selection .................................................................... 18 General Description ......................................................................... 1 Programmable Undervoltage Lockout (UVLO) .................... 19 Revision History ............................................................................... 2 Soft Start Function ..................................................................... 19 Specifications ..................................................................................... 3 Power-Good Feature .................................................................. 20 Input and Output Capacitor, Recommended Specifications .... 4 Noise Reduction of the Adjustable ADP7105 ........................ 20 Absolute Maximum Ratings ............................................................ 5 Current-Limit and Thermal Overload Protection ................. 21 Thermal Data ................................................................................ 5 Thermal Considerations ............................................................ 21 Thermal Resistance ...................................................................... 5 Printed Circuit Board Layout Considerations ............................ 24 ESD Caution .................................................................................. 5 Outline Dimensions ....................................................................... 25 Pin Configurations and Function Descriptions ........................... 6 Ordering Guide .......................................................................... 26 Typical Performance Characteristics ............................................. 7 REVISION HISTORY 1/2020Rev. B to Rev. C 10/2015Rev. A to Rev. B Changes to Features Section............................................................ 1 Changes to Figure 60 and Figure 61 ............................................ 17 Changes to Fixed Output Voltage Accuracy Parameter, Table 1 and Adjustable Output Voltage Accuracy Parameter, Table 1 .. 3 5/2014Rev. 0 to Rev. A Changes to Figure 60 and Figure 61 ............................................. 17 Change to UVLO Threshold Rising Parameter, Table 1 .............. 4 Updated Outline Dimensions ....................................................... 25 Changes to Ordering Guide .......................................................... 26 7/2013Revision 0: Initial Version Rev. C Page 2 of 26