A4988 View Datasheet(PDF) - Allegro MicroSystems

Part Name

Description

Manufacturer

A4988

DMOS Microstepping Driver with Translator and Overcurrent Protection / 28-contact QFN

Allegro MicroSystems 

A4988

DMOS Microstepping Driver with Translator

And Overcurrent Protection

ELECTRICAL CHARACTERISTICS1 at TA = 25°C, VBB = 35 V (unless otherwise noted)

Characteristics

Symbol

Test Conditions

Output Drivers

Load Supply Voltage Range

Logic Supply Voltage Range

Output On Resistance

Body Diode Forward Voltage

Motor Supply Current

VBB

VDD

RDSON

VF

IBB

Operating

Operating

Source Driver, IOUT = –1.5 A

Sink Driver, IOUT = 1.5 A

Source Diode, IF = –1.5 A

Sink Diode, IF = 1.5 A

fPWM < 50 kHz

Operating, outputs disabled

Min.

8

3.0

–

–

–

–

–

–

Typ.2

–

–

320

320

–

–

–

–

Max.

35

5.5

430

430

1.2

1.2

4

2

Units

V

V

mΩ

mΩ

V

V

mA

mA

Logic Supply Current

IDD

fPWM < 50 kHz

Outputs off

–

–

8

mA

–

–

5

mA

Control Logic

Logic Input Voltage

Logic Input Current

Microstep Select

Logic Input Hysteresis

Blank Time

Fixed Off-Time

Reference Input Voltage Range

Reference Input Current

Current Trip-Level Error3

Crossover Dead Time

Protection

Overcurrent Protection Threshold4

Thermal Shutdown Temperature

Thermal Shutdown Hysteresis

VDD Undervoltage Lockout

VDD Undervoltage Hysteresis

VIN(1)

VIN(0)

IIN(1)

IIN(0)

RMS1

RMS2

RMS3

VHYS(IN)

tBLANK

tOFF

VREF

IREF

errI

tDT

IOCPST

TTSD

TTSDHYS

VDDUVLO

VDDUVLOHYS

× VIN = VDD 0.7

× VIN = VDD 0.3

MS1 pin

MS2 pin

MS3 pin

As a % of VDD

OSC = VDD or GND

ROSC = 25 kΩ

VREF = 2 V, %ITripMAX = 38.27%

VREF = 2 V, %ITripMAX = 70.71%

VREF = 2 V, %ITripMAX = 100.00%

VDD rising

× VDD 0.7

–

–

V

–

–

× VDD 0.3

V

–20

<1.0

20

µA

–20

<1.0

20

µA

–

100

–

kΩ

–

50

–

kΩ

–

100

–

kΩ

5

11

19

%

0.7

1

1.3

μs

20

30

40

μs

23

30

37

μs

0

–

4

V

–3

0

3

μA

–

–

±15

%

–

–

±5

%

–

–

±5

%

100

475

800

ns

2.1

–

–

A

–

165

–

°C

–

15

–

°C

2.7

2.8

2.9

V

–

90

–

mV

1For input and output current specifications, negative current is defined as coming out of (sourcing) the specified device pin.

2Typical data are for initial design estimations only, and assume optimum manufacturing and application conditions. Performance may vary for individual

units, within the specified maximum and minimum limits.

3VERR = [(VREF/8) – VSENSE] / (VREF/8).

4Overcurrent protection (OCP) is tested at TA = 25°C in a restricted range and guaranteed by characterization.

Allegro MicroSystems, LLC

4

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

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