A3949 datasheet(3/7 Pages) ALLEGRO

Part #	A3949

Description	DMOS Full-Bridge Motor Driver

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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3 / 7 page

DMOS Full-Bridge Motor Driver

A3949

3

Allegro MicroSystems, Inc.

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

ELECTRICAL CHARACTERISTICS at T

A = 25°C, VBB = 8 V to 36 V (unless otherwise noted)

Characteristics

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Output-On Resistance

R

DSON

Source driver, I

OUT = –2.8 A, TJ= 25°C

–

.4

.48

Ω

Source driver, I

OUT = –2.8 A, TJ= 125°C

–

.68

–

Ω

Sink driver, I

OUT = 2.8 A, TJ= 25°C

–

.3

.43

Ω

Sink driver, I

OUT = –2.8 A, TJ= 125°C

–

.576

–

Ω

Body Diode Forward Voltage

V

F

Source diode, I

F = –2.8 A

–

1.1

1.3

V

Sink diode, I

F = 2.8 A

–

1

1.3

V

Motor Supply Current

I

BB

f

PWM < 50 kHz

–

6

8.5

mA

Charge pump turned on; outputs disabled

–

3

4.5

mA

Sleep mode

–

10

μA

Logic Input Voltage

PHASE, ENABLE, MODE

V

IN(1)

2.0

–

V

IN(0)

–

0.8

V

Logic Input Voltage

SLEEP

V

IN(1)

2.7

–

V

IN(0)

–

0.8

V

Logic Input Current

PHASE, MODE pins

I

IN(1)

V

IN = 2.0 V

–

< 1.0

20

μA

I

IN(0)

V

IN = 0.8 V

–

< –2.0

–20

μA

Logic Input Current

ENABLE pin

I

IN(1)

V

IN = 2.0 V

–

40

100

μA

I

IN(0)

V

IN = 0.8 V

–

16

40

μA

Logic Input Current

SLEEP pin

I

IN(1)

V

IN = 2.7 V

–

27

50

μA

I

IN(0)

V

IN = 0.8 V

–

< 1

10

μA

Propagation Delay Times

t

pd

From PWM change to source or sink turn on

–

600

–

ns

From PWM change to source or sink turn off

–

100

–

ns

Crossover Delay

t

COD

–

500

–

ns

Protection Circuitry

UVLO Enable Threshold

VBB rising

–

6

–

V

UVLO Hysteresis

–

250

–

mV

Thermal Shutdown Temp.

T

J

–

170

–

°C

Thermal Shutdown Hysteresis

ΔT

J

–15

–

°C

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