A4406 데이터 시트보기 (PDF) - Allegro MicroSystems

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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

Functional Block Diagram

3.3 V

(From V33)

0.22 μF 0.22 μF

RTON

412 kΩ

CIN1

CIN2

4.7 μF 4.7 μF

VBAT

DIN

B240A

Microcontroller

Reset

4.7 kΩ

NPOR

CCPOR

0.22 μF

CPOR

VIGN 1 kΩ

100 Ω

ENBAT

3.3 V

(From V33)

100 nF

4.7 kΩ

ENBATS

Microcontroller

Enable

ENB

VIN(Pin1)

D2

5V

Protected

B240A

A

V5P

V5P

CV5P

1 to 2.2 μF

DV5P

B240A

LX

Charge Pump

Fault

VREG UVLO

V33 UVLO

TSD

PWM Control

Switch

Disable

ISEN–

ISEN+

8.5 V

+

–

4.0 VH

2.2 VL

Soft Start

Ramp

Generator

VREF

ENB

VREG

Regulator VREF

CLV33

VREF V33 VREG

V33 FET

Driver

V5 Control and

V33 to V5P

Tracking Control

VREG

G33

VREF

V33

GND

Short to Supply

Protection

PAD

DBUCK

B240A

RSENSE

300 mΩ

1/4 W

L1

10 μH, 1.3 A

65 mΩ MAX

CVREG

10 μF

0.47 μF

RCL

390 mΩ

1/4 W

RDROP

1.2 Ω

1/2 W

QV33

3.3 V, 400 mA

(500 mA MAX)

CV33

1 to 4.7 μF

A ProtecƟon diodes D1 and D2 are required when the V5P pin is driving a wiring harness (or excessively long

PCB trace) where parasiƟc inductance will cause the voltage at the V5P to momentarily transiƟon above

VIN or below ground during a fault condiƟon.

Allegro MicroSystems, Inc.

4

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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