ADP3025 Просмотр технического описания (PDF) - Analog Devices

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ADP3025

High Efficiency Dual Output Power Supply Controller

Analog Devices 

ADP3025

TABLE OF CONTENTS

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

Output Voltage Adjustment ...................................................... 13

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

Application Information ........................................................... 13

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

Input Voltage Range ................................................................... 13

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

Maximum Output Current and MOSFET Selection ............. 14

Typical Performance Characteristics ............................................. 9

Nominal Inductor Value............................................................ 15

Theory of Operation ...................................................................... 11

Inductor Selection ...................................................................... 15

Internal 5 V Supply (INTVCC) ................................................ 11

Reference (REF).......................................................................... 11

Boosted High-Side Gate Drive Supply (BST) ......................... 11

E Synchronous Rectifier (DRVL) ................................................ 11

Oscillator Frequency and Synchronization (SYNC).............. 11

T Shutdown SD............................................................................... 11

Soft Start and Power-Up Sequencing (SS) .............................. 11

E Current Limiting (CLSET)........................................................ 12

Output Undervoltage Protection.............................................. 12

L Output Overvoltage and Reverse Voltage Protection............ 12

Power Good Output (PWRGD) ............................................... 12

O Linear Regulator Controller...................................................... 12

REVISION HISTORY

S Revision A

4/04—Data Sheet changed from Rev. 0 to Rev. A

B Change

Page

Changes to Features...................................................................... 1

Changes to Specifications ............................................................ 3

O Changes to Figures 4 and 5.......................................................... 9

CIN and COUT Selection ............................................................... 16

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

Soft Start ...................................................................................... 17

Fixed or Adjustable Output Voltage......................................... 17

Efficiency Enhancement............................................................ 17

Transient Response Considerations......................................... 18

Feedback Loop Compensation................................................. 18

Compensation Loop Design and Test Method ...................... 19

Recommended Applications..................................................... 19

Layout Considerations............................................................... 19

Outline Dimensions ....................................................................... 21

Ordering Guide .......................................................................... 21

Changes to Theory of Operation section ................................ 11

Changes to Output Voltage Adjustment section .................... 13

Changes to Table 5...................................................................... 13

Changes to Table 6...................................................................... 15

Changes to Table 8...................................................................... 16

Changes to Table 9...................................................................... 17

1/04—Revision 0: Initial Version

Rev. A | Page 2 of 24

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