A4406 datasheet(17/27 Pages) ALLEGRO

Part #	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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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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17 / 27 page

Constant On-Time Buck Regulator

With One External and One Internal Linear Regulator

A4406

17

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

VIN

NPOR

CPOR

ENBATS

ENBAT

ENB

V5P

3

V3

Internal

VRAIL

or VCP

VREG

10 ms

20 ms

1.2V

13.5V

VH =5.00V

VH=2.95V

VL=4.94V

V

L=2.83 V

6.5 V

Internal

UVLO

5.2 V

5.5 V

4.9V

VENBAT = 0V

ENBATS is not connected

100 %Duty

Cycle

Internal regulators

collapse

0.8V MAX

1.0V

Internal

UVLO

VENB ≥ 2V prior to

VIN ramping up

VREG > 5.00 V and

V33 > 2.95 V

ENB < 0.8V or

VREG < 4.94V or

V33 < 2.83V

VCP low or

Internal VRAIL low

V5P tracks V33 until

VV33NPOR(L) or VIN < 5.5 V

V5P and V33 ramp

at approximately the

same rate as VREG

NPOR is open-drain, pulled up to V33

Decay rates of VREG,

V5P, and V33 depend on

output capacitances and

loading

Typical power-up and power-down via VIN with ENB always logic high; ENBAT and ENBATS are not used

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