ADP5003

Data Sheet

Rev. A | Page 2 of 31

TABLE OF CONTENTS

Features .............................................................................................. 1

Applications....................................................................................... 1

Functional Block Diagram .............................................................. 1

General Description......................................................................... 1

Revision History ............................................................................... 3

Specifications..................................................................................... 4

Buck Regulator Specifications .................................................... 5

LDO Specifications ...................................................................... 6

Adaptive Headroom Controller Specifications ........................ 6

Absolute Maximum Ratings............................................................ 7

Thermal Resistance ...................................................................... 7

ESD Caution.................................................................................. 7

Pin Configuration and Function Descriptions............................. 8

Typical Performance Characteristics ............................................. 9

Theory of Operation ...................................................................... 15

Power Management Unit........................................................... 15

Buck Regulator............................................................................ 15

LDO Regulator............................................................................ 17

Power-Good ................................................................................ 18

Output Voltage of the Buck Regulator..................................... 18

Output Voltage of the LDO Regulator..................................... 18

Voltage Conversion Limitations............................................... 18

Component Selection................................................................. 19

Compensation Components Design........................................ 21

Junction Temperature ................................................................ 21

Buck Regulator Design Example .................................................. 22

Setting the Switching Frequency for the Buck Regulator ....... 22

Setting the Output Voltage for the Buck Regulator ................. 22

Selecting the Inductor for the Buck Regulator......................... 22

Selecting the Output Capacitor for the Buck Regulator.......... 22

Designing the Compensation Network for the Buck Regulator

....................................................................................................... 23

Selecting the Input Capacitor for the Buck Regulator............. 23

Adaptive Headroom Control Design Example .......................... 24

Setting the Switching Frequency for the Buck Regulator Using

Adaptive Headroom Control.................................................... 24

Setting the Output Voltage for the LDO Regulator Using

Adaptive Headroom Control.................................................... 24

Selecting the Inductor for the Buck Regulator UsingAdaptive

Headroom Control..................................................................... 24

Selecting the Output Capacitors for the Buck Regulator Using

Adaptive Headroom Control.................................................... 24

Designing the Compensation Network for the Buck

Regulator Using Adaptive Headroom Control....................... 25

Selecting the Input Capacitor for the Buck Regulator Using

Adaptive Headroom Control.................................................... 25

Recommended External Components for the Buck Regulator

....................................................................................................... 26

Buck Configurations ...................................................................... 28

Independent................................................................................ 28

Adaptive Headroom................................................................... 29

Layout Considerations................................................................... 30

Outline Dimensions....................................................................... 31

Ordering Guide .......................................................................... 31