A4406 查看數據表（PDF） - Allegro MicroSystems

零件编号

产品描述 (功能)

生产厂家

A4406

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

Allegro MicroSystems 

A4406

Constant On-Time Buck Regulator

With One External and One Internal Linear Regulator

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

V5P Tracking Regulator

14

3.3 V Linear Regulator

14

Charge Pump

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

Share Link: