ADP1850

Data Sheet

Rev. C | Page 2 of 32

TABLE OF CONTENTS

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

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

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

Typical Operation Circuit................................................................ 1

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

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

Absolute Maximum Ratings............................................................ 5

ESD Caution.................................................................................. 5

Simplified Block Diagram ............................................................... 6

Pin Configuration and Function Descriptions............................. 7

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

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

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

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

Modes of Operation ................................................................... 13

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

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

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

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

Overvoltage Protection.............................................................. 14

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

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

Shutdown Control ...................................................................... 15

Thermal Overload Protection................................................... 15

Applications Information .............................................................. 16

Setting the Output Voltage........................................................ 16

Soft Start ...................................................................................... 16

Setting the Current Limit .......................................................... 16

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

Setting the Slope Compensation .............................................. 17

Setting the Current Sense Gain ................................................ 17

Input Capacitor Selection.......................................................... 18

Input Filter................................................................................... 18

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

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

Output Capacitor Selection....................................................... 19

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

Loop Compensation (Single Phase Operation) ..................... 21

Configuration and Loop Compensation (Dual-Phase

Operation)................................................................................... 22

Switching Noise and Overshoot Reduction............................ 22

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

Indepdendent Power Stage Input Voltage............................... 24

PCB Layout Guidelines.................................................................. 25

MOSFETs, Input Bulk Capacitor, and Bypass Capacitor ...... 25

High Current and Current Sense Paths................................... 25

Signal Paths ................................................................................. 25

PGND Plane................................................................................ 25

Feedback and Current-Limit Sense Paths............................... 25

Switch Node ................................................................................ 26

Gate Driver Paths ....................................................................... 26

Output Capacitors...................................................................... 26

Typical Operating Circuits............................................................ 27

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

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

REVISION HISTORY

5/2017—Rev. B to Rev. C

Changes to Oscillator Frequency Section.................................... 12

2/2017—Rev. A to Rev. B

Changed CP-32-11 to CP-32-12 .................................. Throughout

Changes to Oscillator Frequency Section.................................... 12

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

Changes to Ordering Guide .......................................................... 31

4/2012—Rev. 0 to Rev. A

Changes to Setting the Current Sense Gain Section.................. 17

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

11/2010—Revision 0: Initial Version