ADP2370/ADP2371

Data Sheet

Rev. A | Page 2 of 32

TABLE OF CONTENTS

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

 

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

 

Typical Application Circuit ............................................................. 1

 

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

 

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

 

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

 

Recommended Specifications: Capacitors ................................ 5

 

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

 

Thermal Data ................................................................................ 6

 

Thermal Resistance ...................................................................... 6

 

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

 

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

 

Typical Performance Characteristics ............................................. 8

 

Buck Output .................................................................................. 8

 

Theory of Operation ...................................................................... 20

 

PWM Operation......................................................................... 20

 

PSM Operation ........................................................................... 21

 

Features Descriptions..................................................................... 22

 

Precision Enable ......................................................................... 22

 

Forced PWM or PWM/PSM Selection.................................... 22

 

Quick Output Discharge (QOD) Function............................. 22

 

Short-Circuit Protection............................................................ 22

 

Undervoltage Lockout ............................................................... 22

 

Thermal Protection.................................................................... 22

 

Soft Start ...................................................................................... 22

 

Current Limit .............................................................................. 22

 

100% Duty Cycle ........................................................................ 23

 

Synchronizing ............................................................................. 23

 

Power Good ................................................................................ 24

 

Applications Information .............................................................. 25

 

ADIsimPower Design Tool ....................................................... 25

 

External Component Selection ................................................ 25

 

Selecting the Inductor................................................................ 25

 

Output Capacitor........................................................................ 25

 

Input Capacitor........................................................................... 25

 

Adjustable Output Voltage Programming .............................. 25

 

Efficiency..................................................................................... 26

 

Recommended Buck External Components .......................... 26

 

Capacitor Selection .................................................................... 28

 

Thermal Considerations................................................................ 29

 

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

 

Packaging and Ordering Information ......................................... 32

 

Outline Dimensions................................................................... 32

 

Ordering Guide .......................................................................... 32

 

REVISION HISTORY

5/12—Rev. 0 to Rev. A

Changed Voltage Range for SW to PGND and Ground Plane

from −0.3 V to VIN + 0.3 V to −0.7 V to VIN + 0.3 V ............... 6

Changes to Ordering Guide .......................................................... 32

4/12—Revision 0: Initial Version