ADP1853

Data Sheet

Rev. 0 | Page 2 of 28

TABLE OF CONTENTS

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

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

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

Revision History ............................................................................... 2

Specifications..................................................................................... 3

Absolute Maximum Ratings............................................................ 6

ESD Caution.................................................................................. 6

Simplified Block Diagram ............................................................... 7

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

Typical Performance Characteristics ........................................... 10

Theory of Operation ...................................................................... 12

Control Architecture.................................................................. 12

Oscillator Frequency.................................................................. 12

Synchronization.......................................................................... 13

PWM or Pulse Skip Mode of Operation ................................. 13

CLKOUT Signal.......................................................................... 13

Synchronous Rectifier and Dead Time ................................... 14

Input Undervoltage Lockout..................................................... 14

Internal Linear Regulator .......................................................... 14

Overvolage Protection ............................................................... 14

Power Good................................................................................. 14

Short-Circuit and Current-Limit Protection.......................... 15

Enable/Disable Control ............................................................. 15

Thermal Overload Protection .................................................. 16

Interleaved Dual-Phase Operation .......................................... 16

Applications Information .............................................................. 17

ADIsimPower Design Tool ....................................................... 17

Setting the Output Voltage........................................................ 17

Soft Start ...................................................................................... 17

Setting the Current Limit .......................................................... 17

Accurate Current-Limit Sensing .............................................. 17

Input Capacitor Selection.......................................................... 17

VIN Pin Filter ............................................................................. 18

Boost Capacitor Selection ......................................................... 18

Inductor Selection ...................................................................... 18

Output Capacitor Selection....................................................... 18

MOSFET Selection..................................................................... 19

Loop Compensation—Voltage Mode...................................... 20

Loop Compensation—Current Mode ..................................... 21

Switching Noise and Overshoot Reduction............................ 23

Voltage Tracking......................................................................... 23

PCB Layout Guidlines ............................................................... 24

Typical Operating Circuits............................................................ 25

Outline Dimensions....................................................................... 27

Ordering Guide .......................................................................... 27

REVISION HISTORY

5/12—Revision 0: Initial Version