A4406 View Datasheet(PDF) - Allegro MicroSystems

Part Name

Description

Manufacturer

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

Pin-out Diagram

VIN 1

GND 2

TON 3

ENBAT 4

ENB 5

ENBATS 6

NPOR 7

CPOR 8

V5P 9

V5P 10

20 VCP

19 CP2

18 CP1

17 LX

PAD

16 ISEN+

15 ISEN–

14 VREG

13 CLV33

12 G33

11 V33

Terminal List Table

Name Number

Function

CLV33

13 3.3 V current sense and limit input

CP1

18 Charge pump capacitor terminal 1

CP2

19 Charge pump capacitor terminal 2

CPOR

8

NPOR delay programming pin

ENB

5

Logic enable input from the microcontroller

ENBAT

4

Ignition enable input from the key or switch via a 1 kΩ resistor

ENBATS

6

Open drain ignition status output

G33

12 Gate driver to the external MOSFET for 3.3 V regulation

GND

2

Ground terminal

ISEN–

15 Buck negative current sense pin, sense resistor and diode node

ISEN+

16 Buck positive current sense pin, sense resistor and ground node

LX

17 Buck regulator switching node

NPOR

7

Active low, open-drain fault indication output

PAD

–

Exposed pad for enhanced thermal dissipation

TON

3

Buck regulator on-time programming pin

V33

11 3.3 V regulator output

V5P

9,10 5 V tracking, protected regulator output

VCP

20 Charge pump reservoir capacitor terminal

VIN

1

Input voltage

VREG

14 Buck regulator DC output, and input to the 3.3 V external regulator

Allegro MicroSystems, Inc.

5

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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