A3979 datasheet(4/15 Pages) ALLEGRO

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DMOS Microstepping Driver with Translator

A3979

Allegro MicroSystems, Inc.

115 Northeast Cutoff, Box 15036

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

www.allegromicro.com

ELECTRICAL CHARACTERISTICS at TA = 25°C, VBB = 35 V, VDD = 3.0 to 5.5 V (unless otherwise noted)

Characteristics

Symbol

Test Conditions

Min.

Typ.1

Max.

Units

Output Drivers

Load Supply Voltage Range

VBB

Operating

–

During Sleep mode

–

Output Leakage Current2

IDSS

VOUT = VBB

–

<1.0

μA

VOUT = 0 V

–

<1.0

–20

μA

Output On Resistance

RDS(On)

Source driver, IOUT = –2.5 A

–

0.28

0.335

Sink driver, IOUT = 2.5 A

–

0.22

0.265

Body Diode Forward Voltage

Source diode, IF = –2.5 A

–

1.4

Sink diode, IF = 2.5 A

–

1.4

Motor Supply Current

IBB

fPWM < 50 kHz

–

8.0

Operating, outputs disabled

–

6.0

Sleep mode

–

μA

Control Logic

Logic Supply Voltage Range

VDD

Operating

3.0

5.0

5.5

Logic Supply Current

IDD

fPWM < 50 kHz

–

Outputs off

–

Sleep mode

–

μA

Logic Input Voltage

VIN(1)

0.7

× VDD

––

VIN(0)

––

0.3

×VDD

Logic Input Current2

IIN(1)

VIN = 0.7× VDD

–20

<1.0

μA

IIN(0)

VIN = 0.3× VDD

–20

<1.0

μA

Reference Input Voltage Range

VREF

Operating

–

VDD

Reference Input Current

IREF

–0

±3

μA

HOME Output Voltage

VHOME(1) IHOME(1) = –200 μA

0.7

× VDD

––

VHOME(0) IHOME(0) = 200 μA–

–

0.3

× VDD

Mixed Decay Mode Trip Point

VPFDH

–

0.6

×VDD

–V

VPFDL

–

0.21

×VDD

–V

Gain (Gm) Error3

VREF = 2 V, Phase Current = 38.27%

–

±10

VREF = 2 V, Phase Current = 70.71%

–

±5.0

VREF = 2 V, Phase Current = 100.00%

–

±5.0

STEP Pulse Width

1––

μs

Blank Time

tBLANK

RT = 56 kΩ, CT = 680 pF

700

950

1200

Fixed Off-Time

tOFF

RT = 56 kΩ, CT = 680 pF

μs

Crossover Dead Time

tDT

Synchronous rectification enabled

100

475

800

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