ADP1974

Data Sheet

Rev. 0 | Page 2 of 19

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

 

Peak Current-Limit Hiccup Implementation......................... 12

 

Negative Current-Limit Detection (Buck Mode) .................. 13

 

PWM Frequency Control.......................................................... 13

 

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 ............................... 16

 

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

 

PCB Layout Guidelines.................................................................. 18

 

Outline Dimensions ....................................................................... 19

 

Ordering Guide .......................................................................... 19

 

REVISION HISTORY

9/15—Revision 0:

Initial Version