A8698ELJTR-T datasheet(4/12 Pages) ALLEGRO

Part #	A8698ELJTR-T

Description	Wide Input Voltage 3.0 A Step Down Regulator

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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4 / 12 page

Wide Input Voltage 3.0 A Step Down Regulator

A8698

4

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000

www.allegromicro.com

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Units

VIN Quiescent Current

IVIN(Q)

VENB = LOW, VIN = 12 V, VBIAS = 3.2 V,

VFB = 1.5 V (not switching)

–

1.0

–

mA

VENB = LOW, VIN = 12 V, VBIAS < 3 V,

VFB = 1.5 V

–

4.1

–

mA

VENB = HIGH

–

100

μA

VBIAS Input Current

IBIAS

VBIAS = VOUT

–

3.8

5

mA

Buck Switch On Resistance

RDS(on)

TA = 25°C, IOUT = 3 A

–

180

–

mΩ

Fixed Off-Time Proportion

Based on calculated value

–15

–

15

%

Feedback Voltage

VFB

0.784

0.8

0.816

V

Output Voltage Regulation

VOUT

IOUT = 0 mA to 3 A

–3

–

3

%

Feedback Input Bias Current

IFB

–400

–100

100

nA

Soft Start Time

tss

510

15

ms

Buck Switch Current Limit

ICL

VFB > 0.4 V

3.5

–

5

A

VFB < 0.4 V

–

1.15

–

A

ENB Open Circuit Voltage

VOC

Output disabled

2.0

–

7

V

ENB Input Voltage Threshold

VENB(0)

LOW level input (Logic 0), output enabled

–

1.0

V

ENB Input Current

IENB(0)

VENB = 0 V

–10

–

–1

μA

VIN Undervoltage Threshold

VUVLO

VIN rising

6.6

6.9

7.2

V

VIN Undervoltage Hysteresis

VUVLO(hys)

VIN falling

0.7

–

1.1

V

Thermal Shutdown Temperature

TJTSD

Temperature increasing

–

165

–

°C

Thermal Shutdown Hysteresis

TJTSD(hys)

Recovery = TJTSD – TJTSD(hys)

–15

–

°C

1Negative current is defined as coming out of (sourcing) the specified device pin.

2Specifications over the junction temperature range of 0ºC to 125ºC are assured by design and characterization.

ELECTRICAL CHARACTERISTICS1,2 at TA = 25°C, VIN = 8 to 25 V (unless noted otherwise)

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