A3998_16 datasheet(4/20 Pages) ALLEGRO

Part #	A3998

Description	Dual DMOS Full Bridge Motor Driver With Serial Port Control and Dual Regulators

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Manufacturer	ALLEGRO [Allegro MicroSystems]

Direct Link	http://www.allegromicro.com

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Dual DMOS Full Bridge Motor Driver

With Serial Port Control and Dual Regulators

A3998

4

Allegro MicroSystems, LLC

115 Northeast Cutoff

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

1.508.853.5000; www.allegromicro.com

ELECTRICAL CHARACTERISTICS1,2 Valid at TJ = 25°C, VBB = 50 V; unless otherwise specified

Characteristics

Symbol

Test Conditions

Min.

Typ.3

Max.

Unit

Load Supply Voltage Range

VBB

Operating

9

–

50

V

Bridge Output On-Resistance

RDS(on)RG

Source driver, IOUT = –1.5 A

–

0.5

–

Ω

Sink driver, IOUT = 1.5 A

–

0.5

–

Ω

VBB Pins Supply Current

IBB

VREG regulated, IOUT = 0 mA, outputs on,

PWM = 50 kHz, Duty Cycle = 50%

–

5

10

mA

IBBS

Standby mode, regulator active

–

5

mA

VIN Pin Supply Current

IIN

–

5

8

mA

Control Logic

Logic Inputs Voltage Range

VIO

Operating

3

–

5.5

V

Logic Input Voltage

VIO(1)

VDD× 0.55

–

V

VIO(0)

–

VDD×0.27

V

Logic Pins Input Current (Except

ENB1,ENB2, FRST pins)

IIO

VIN = 0 to 5 V

–20

<1.0

20

μA

ENB1,ENB2, FRST Pins Input Current

IIO(1)

VIN = 3.3 V

–

66

100

μA

IIO(0)

VIN = 0.8 V

–

16

40

μA

Input Hysteresis

VIOHYS

200

–

700

mV

Propagation Delay Time

tpd

PWM change to source on

350

550

1000

ns

PWM change to source off

35

–

250

ns

PWM change to sink on

350

550

1000

ns

PWM change to sink off

35

–

250

ns

Crossover Delay

tCOD

300

425

1000

ns

Supply Monitor

Reset Timer

tPOR

70

100

130

ms

RSTN and PMON Pins Output

Voltage

VRST

IOUT = 1 mA

–

0.5

V

RSTN and PMON Pins Output

Leakage Current

Ileakage

VOUT = 5 V

–

1

μA

Power Monitor Threshold

VPM(th)

PMON pin, VBB falling

12

13

14

V

Power Monitor Hysteresis

VPMHYS

–

2

–

V

Protection Circuits

VIN Pin UVLO Threshold

VINUV(th)

VIN rising

–

2.8

3

V

VIN Pin UVLO Hysteresis

VINUVHYS

–

100

–

mV

VBB Pins UVLO Threshold

VBBUV(th) VBB rising

6.6

7.1

7.6

V

VBB Pins UVLO Hysteresis

VBBUVHYS

0.7

0.9

1.1

V

FB1 Pin UVLO Threshold

VFBUV(th) VFB falling

698

735

772

mV

FB1 Pin UVLO Hysteresis

VFBUVHYS

–

100

–

mV

Thermal Shutdown Temperature

TJSD

155

165

175

°C

Thermal Shutdown Hysteresis

TJSDHYS

–

20

–

°C

Continued on the next page…

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