ADP1972

Data Sheet

TABLE OF CONTENTS

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

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

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

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

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

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

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

Thermal Operating Ranges......................................................... 5

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

Pin Configuration and Function Descriptions............................. 6

Typical Performance Characteristics ............................................. 7

Theory of Operation ...................................................................... 10

Supply Pins .................................................................................. 10

EN/Shutdown.............................................................................. 11

Undervoltage Lockout (UVLO) ............................................... 11

Soft Start ...................................................................................... 11

Operating Modes........................................................................ 11

PWM Drive Signals.................................................................... 12

External COMP Control ........................................................... 12

Current Limit.............................................................................. 12

PWM Frequency Control.......................................................... 12

Maximum Duty Cycle ............................................................... 13

External Fault Signaling ............................................................ 13

Thermal Shutdown (TSD) ........................................................ 13

Applications Information .............................................................. 14

Buck or Boost Selection............................................................. 14

Selecting RS to Set the Current Limit....................................... 14

Adjusting the Operating Frequency ........................................ 14

Programming the Maximum Duty Cycle ............................... 15

Adjusting the Soft Start Period................................................. 16

PCB Layout Guidelines.................................................................. 17

Outline Dimensions....................................................................... 18

Ordering Guide .......................................................................... 18

REVISION HISTORY

11/14—Rev. A to Rev. B

Changes to EN Threshold Falling Parameter, Unit

Column, Table 1................................................................................ 4

Changes to the Programming Maximum Duty Cycle Section...... 15

6/14—Rev. 0 to Rev. A

Changes to Maximum Duty Cycle Range Parameter, Table 1.... 3

Changes to Equation 7 and Equation 9 ....................................... 15

Changes to Ordering Guide .......................................................... 18

1/14—Revision 0: Initial Version

Rev. B | Page 2 of 18