ADP2389/ADP2390

Data Sheet

Rev. 0 | Page 2 of 23

TABLE OF CONTENTS

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

 

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

 

Typical Applications Circuit............................................................ 1

 

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

 

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

 

Detailed Functional Block Diagram .............................................. 3

 

Specifications..................................................................................... 4

 

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

 

Thermal Information ................................................................... 6

 

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

 

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

 

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

 

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

 

Control Scheme .......................................................................... 12

 

PFM Mode (ADP2390 Only).................................................... 12

 

Precision Enable/Shutdown ...................................................... 12

 

Internal Regulator (VREG) ....................................................... 12

 

Bootstrap Circuitry .................................................................... 12

 

Oscillator ..................................................................................... 12

 

Soft Start ...................................................................................... 13

 

Fast Transient Response ............................................................ 13

 

Power Good................................................................................. 13

 

Peak Current-Limit and Short-Circuit Protection................. 13

 

Overvoltage Protection (OVP) ................................................. 13

 

Undervoltage Lockout (UVLO) ............................................... 13

 

Thermal Shutdown .................................................................... 13

 

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

 

Input Capacitor Selection.......................................................... 14

 

Output Voltage Setting .............................................................. 14

 

Inductor Selection ...................................................................... 14

 

Output Capacitor Selection....................................................... 15

 

Programming Input Voltage UVLO ........................................ 15

 

Compensation Design ............................................................... 15

 

Design Example .............................................................................. 17

 

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

 

Frequency Setting....................................................................... 17

 

Inductor Selection ...................................................................... 17

 

Output Capacitor Selection....................................................... 17

 

Compensation Components..................................................... 18

 

Soft Start Time Program ........................................................... 18

 

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

 

Schematic for Design Example................................................. 18

 

External Components Recommendation.................................... 19

 

Circuit Board Layout Recommendations ................................... 20

 

Typical Application Circuits ......................................................... 22

 

Outline Dimensions ....................................................................... 23

 

Ordering Guide .......................................................................... 23

 

REVISION HISTORY

8/15—Revision 0: Initial Version