ADP1621

Data Sheet

Rev. D | Page 2 of 32

TABLE OF CONTENTS

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

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

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

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

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

Simplified Block Diagram ............................................................... 3

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

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

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

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

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

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

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

Control Loop............................................................................... 12

Current-Sense Configurations.................................................. 12

Current Limit .............................................................................. 13

Undervoltage Lockout ............................................................... 13

Shutdown..................................................................................... 13

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

Internal Shunt Regulators.......................................................... 13

Setting the Oscillator Frequency and Synchronization

Frequency .................................................................................... 13

Application Information: Boost Converter................................. 14

ADIsimPower Design Tool ....................................................... 14

Duty Cycle................................................................................... 14

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

Inductor Current Ripple............................................................ 14

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

Input Capacitor Selection.......................................................... 15

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

Diode Selection........................................................................... 16

MOSFET Selection..................................................................... 16

Loop Compensation .................................................................. 17

Slope Compensation.................................................................. 18

Current Limit.............................................................................. 18

Light Load Operation ................................................................ 19

Recommended Component Manufacturers........................... 19

Layout Considerations................................................................... 20

Efficiency Considerations ............................................................. 21

Examples of Application Circuits................................................. 22

Standard Boost Converter—Design Example ........................ 22

Bootstrapped Boost Converter................................................. 23

SEPIC Converter Circuit........................................................... 27

Low Voltage Power-Input Circuit ............................................ 27

LED Driver Application Circuits ............................................. 28

Related Devices............................................................................... 30

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

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

REVISION HISTORY

2/16— Rev. C to Rev. D

Changes to Figure 39 and Figure 40............................................. 27

10/15—Rev. B to Rev. C

Moved Figure 3 ................................................................................. 3

Changes to Shunt Regulation Voltage Parameter, Table 1 .......... 4

6/12—Rev. A to Rev. B

Change to Features Section ............................................................. 1

Added ADIsimPower Design Tool Section................................. 14

Change to Table 6 ........................................................................... 30

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

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

12/06—Rev. 0 to Rev. A

Changes to Table 1.............................................................................3

Changes to Table 2.............................................................................5

Added Table 3 ....................................................................................5

Changes to Table 5.......................................................................... 19

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

7/06—Revision 0: Initial Version