A4406 datasheet(16/27 Pages) ALLEGRO

No de pièce	A4406

Description	The A4406 is an automotive power management IC that uses a high frequency constant on-time 5.45 V pre-regulator to supply an internal 5 V linear regulator and a 3.3 V linear DMOS driver.

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Fabricant	ALLEGRO [Allegro MicroSystems]

Site Internet	http://www.allegromicro.com

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16 / 27 page

Constant On-Time Buck Regulator

With One External and One Internal Linear Regulator

A4406

16

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Timing Diagrams

Typical power-up and power-down by ENBAT and ENB with VIN = 13.5 V; ENBATS is assumed to be connected to V33 via a pull-up resistor

VIN

NPOR

CPOR

ENBATS

ENBAT

ENB

V5P

3

V3

Internal

VRAIL

or VCP

VREG

VH=4.0V

VL=2.2V

10 ms

20 ms

1.2 V

13.5 V

VH=5.00V

VH=2.95V

Clamped at ≈8.5V via1kΩ

VL=4.94V

VL=2.83 V

VH=2 V

VL=0.8V

Internal

UVLO

1.0V

0.8 V MAX

Internal

UVLO

VREG > 5.00 V and

V33 > 2.95 V

ENB < 0.8V or

VREG < 4.94V or

V33 < 2.83V or

VCP low or

Internal VRAIL low

NPOR is open-drain, pulled up to V33

Decay rates of VREG, V5P,

and V33 depend on output

capacitances and loading

ENBATS is open-drain, pulled up to V33

V5P and V33 ramp at

approximately the same

rate as VREG

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