A4409KLPTR-T datasheet(10/30 Pages) ALLEGRO

Part #	A4409KLPTR-T

Description	Buck or buck-boost pre-regulator

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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10 / 30 page

Adjustable Frequency Buck or Buck-Boost Pre-Regulator with

2 LDOs, Window Watchdog Timer, and NPOR

A4409

10

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Unit

NPOR UNDERVOLTAGE PROTECTION THRESHOLDS

5V0 Undervoltage Thresholds

V5V0(UV,H)

V5V0 rising

–

4.665

–

V

V5V0(UV,L)

V5V0 falling

4.5

4.625

4.75

V

5V0 Undervoltage Hysteresis

V5V0(UV,HYS) V5V0(UV,H) – V5V0(UV,L)

20

40

60

mV

NPOR TURN-ON AND TURN-OFF DELAYS

NPOR Turn-On Delay

td(on)NPOR

18

22.5

27

ms

NPOR Turn-Off Propagation Delay

td(off)NPOR

ENBAT low to NPOR low, measured after

ENBAT deglitch time td(ENBAT,FILT)

–

3

µs

NPOR OUTPUT VOLTAGES

NPOR Output Low Voltage

VNPOR(L)

ENBAT high, VIN ≥ 2.5 V, INPOR = 4 mA

–

150

400

mV

ENBAT high, VIN = 1.5 V, INPOR = 2 mA

–

800

mV

NPOR Leakage Current1

INPOR(LEAK) VNPOR = 3.3 V

–

2

µA

NPOR UNDERVOLTAGE FILTERING/DEGLITCH

NPOR Undervoltage Filter/Deglitch Times td(NPOR,FILT) Applies to undervoltage of the 5V0 voltage

10

15

20

µs

1

Negative current is defined as coming out of the node or pin (sourcing), positive current is defined as going into the node or pin (sinking).

ELECTRICAL CHARACTERISTICS – DIAGNOSTIC OUTPUTS1: Valid at 3 V ≤ VIN ≤ 36 V in buck-boost mode and VIN hav-

ing first reached VIN(START), –40ºC ≤ TA = TJ ≤ 150ºC, unless otherwise specified.

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A4409KLPTR-T Datasheet(PDF) 10 Page - Allegro MicroSystems

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