3957 datasheet(4/16 Pages) ALLEGRO

Part #	3957

Description	FULL-BRIDGE PWM MICROSTEPPING MOTOR DRIVER

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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4 / 16 page

3957

FULL-BRIDGE PWM

MICROSTEPPING

MOTOR DRIVER

115 Northeast Cutoff, Box 15036

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

ELECTRICAL CHARACTERISTICS at TA = 25˚C, VBB = 5 V to 50 V, VCC = 4.5 V to 5.5 V (unless

otherwise noted.)

Limits

Characteristic

Symbol

Test Conditions

Min.

Typ.

Max.

Units

Power Outputs

Load Supply Voltage Range

VBB

Operating, IOUT = ±1.5 A, L = 3 mH

VCC

—50

V

Output Leakage Current

ICEX

VOUT = VBB

—

<1.0

50

µA

VOUT = 0 V

—

<-1.0

-50

µA

Output Saturation Voltage

VCE(SAT)

VS = 1.0 V:

(Forward or Reverse Mode)

Source Driver, IOUT = -0.85 A

—

1.1

1.2

V

Source Driver, IOUT = -1.5 A

—

1.4

1.5

V

Sink Driver, IOUT = 0.85 A

—

0.5

0.7

V

Sink Driver, IOUT = 1.5 A

—

1.2

1.5

V

Sense Current Offset

ISO

IS - IOUT, IOUT = 850 mA,

20

30

40

mA

VS = 0 V, VCC = 5 V

Clamp Diode Forward Volt.

VF

IF = 0.85 A

—

1.2

1.4

V

(Sink or Source)

IF = 1.5 A

—

1.5

1.7

V

Motor Supply Current

IBB(ON)

—

2.0

4.0

mA

(No Load)

IBB(OFF)

D0 = D1 = D2 = D3 = 0.8 V

—

1.0

50

µA

Control Circuitry

Logic Supply Voltage Range

VCC

Operating

4.5

5.0

5.5

V

Reference Voltage Range

VREF

Operating

0.5

—

2.5

V

UVLO Enable Threshold

VCC = 0 → 5 V

3.35

3.70

4.05

V

UVLO Hysteresis

0.25

0.40

0.55

V

Logic Supply Current

ICC(ON)

—42

50

mA

ICC(OFF)

D0 = D1 = D2 = D3 = 0.8 V

—

14

17

mA

Logic Input Voltage

VIN(1)

2.0

—

V

VIN(0)

—

0.8

V

Logic Input Current

IIN(1)

VIN = 2.0 V

—

<1.0

20

µA

IIN(0)

VIN = 0.8 V

—

<-2.0

-200

µA

Continued next page…

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