A4405 데이터 시트보기 (PDF) - Allegro MicroSystems

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A4405

Constant On-Time Buck Regulator With One External and Two Internal Linear Regulators

Allegro MicroSystems 

A4405

Constant On-Time Buck Regulator

With One External and Two Internal Linear Regulators

Table of Contents

Specifications

2

Functional Block Diagram

4

Pin-out Diagram and Terminal List

5

Electrical Characteristics

6

Characteristic Performance

9

Functional Description

11

Basic Operation

11

Overcurrent Protection

11

Dropout Mode

11

Soft Start

11

Buck Pulse Width ( tON )

11

ISEN+ and ISEN–

11

Switcher Overcurrent Protection

12

LX Short Circuit Protection

12

Missing Asynchronous Diode Protection

13

Thermal Shutdown

13

Power-On Reset (NPOR)

13

V5 Regulator

14

V5P Tracking Regulator

14

3.3 V Linear Regulator

15

Charge Pump

15

ENBAT

15

ENBATS

15

ENB

15

Timing Diagrams

16

Application Information

18

Switcher On-Time and Switching Frequency 18

Low Voltage Operation

18

Inductor Selection

18

Output Capacitor

19

Input Capacitor

19

Rectification Diode

19

External MOSFET Selection

19

3.3 V Dropping Resistor (RDROP)

20

PCB Layout

21

Application Circuit Performance

23

Package Outline Drawing

26

Allegro MicroSystems, Inc.

3

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

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