Datasheet UDN2998W Datasheet (Allegro)

2998

DUAL FULL-BRIDGE

MOTOR DRIVER

As an interface between low-level logic and solenoids, dc (brush)
motors, or stepper motors, the UDN2998W dual full-bridge driver will
operate inductive loads up to 50 V with continuous output currents of
up to 2 A per bridge or peak (start-up) currents to 3 A. The control
inputs are compatible with TTL, DTL, and 5 V CMOS logic. Except
for a common supply voltage and thermal shutdown, the two drivers in
each package are completely independent.

For external PWM control, an Output Enable for each bridge
circuit is provided and the sink driver emitters are pinned out for
connection to external current-sensing resistors. The chopper drive
mode is characterized by low power dissipation levels and maximum
efficiency. A PHASE input to each bridge determines load-current
direction.

Data Sheet

29319.6B†

Dwg. No. W-106

ABSOLUTE MAXIMUM RATINGS

at T

≤ +150°C

J

Supply Voltage, VBB.......................... 50 V

Output Current, I

(peak) ........................................... ±3 A

Sink Driver Emitter Voltage, VE...... 1.5 V

Logic Input Voltage Range,

V

or V

PHASE

Package Power Dissipation,

PD....................................... See Graph

Operating Temperature Range,

TA.............................. -20°C to +85°C

Storage Temperature Range,

TS............................. -55°C to +150°C

NOTE: Output current rating may be limited
by chopping frequency, ambient tempera­ture, air flow, or heat sinking. Under any set
of conditions, do not exceed the specified
current rating or a junction temperature of
+150°C.

(continuous) ..... ±2 A

OUT

....... -0.3 V to 15 V

ENABLE

Extensive circuit protection is provided on-chip. Both ground­clamp and flyback diodes for each bridge are provided. A thermal
shutdown circuit disables the load drive if chip temperature rating
(package power dissipation) is exceeded. Internally-generated delays
provide crossover-current protection.

The UDN2998W is packaged in a 12-pin single in-line power-tab
package for high power capabilities. Driving either of the bridges at
the full 2 A dc rating requires the use of an external heat sink. The tab
is at ground potential and needs no insulation.

FEATURES

■ ±3 A Peak Output Current

■ Output Voltage to 50 V

■ Integral Output Suppression Diodes

■ Output Current Sensing

■ TTL/CMOS Compatible Inputs

■ Internal Thermal Shutdown Circuitry

■ Crossover-Current Protected

■ Automotive Capable

Always order by complete part number: UDN2998W .

2998

DUAL FULL-BRIDGE
MOTOR DRIVER

FUNCTIONAL BLOCK DIAGRAM

(ONE OF TWO DRIVERS)

BB

Dwg. No. W-107A

To maintain isolation between integrated circuit components and to
provide for normal transistor operation, the ground tab must be
connected to the most negative point in the external circuit.

10

R = 2.0°C/W

θJT

8

6

12°C/W HEAT SINK

4

2

FREE AIR, R = 38°C/W

3.0°C/W HEAT SINK

R = 14°C/W

θJA

θJA

R = 5.0°C/W

θJA

ENABLE PHASE

INPUT INPUT OUTPUT 1 OUTPUT 2

Low High High Low

Low Low Low High
High High Open Low
High Low Low Open

TRUTH TABLE

0

ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS

25

50 75 100 125 150

TEMPERATURE IN °C

Dwg. GP-012B

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

Copyright © 1985, 2000 Allegro MicroSystems, Inc.

2998

DUAL FULL-BRIDGE

MOTOR DRIVER

ELECTRICAL CHARACTERISTICS at TA = +25°C, TJ ≤ +150°C, VBB = 50 V

Limits

Characteristic Symbol Test Conditions Min. Typ. Max. Units

Output Drivers

Operating Voltage Range V

Output Leakage Current I

Output Saturation Voltage V

Output Sustaining Voltage V

Source Driver Rise Time t

Source Driver Fall Time t

Deadtime t

Clamp Diode Leakage Current I

Clamp Diode Forward Voltage V

Supply Current I

Control Logic (PHASE or ENABLE)

Logic lnput Voltage V

V

Logic Input Current I

I

Turn-On Delay Time t

Turn-Off Delay Time t

NOTES:1. Each driver is tested separately.

2. Test is performed with V

= 0.8 V and then repeated for V

PHASE

3. Negative current is defined as coming out of (sourcing) the specified device pin.

BB

CEX

CE(SAT)

CE(sus)

r

f

d

R

F

BB

IN(0)

IN(1)

IN(0)

IN(1)

pd0

pd1

10 — 50 V

V

= 50 V, V

OUT

V

= 0, V

OUT

I

= 1 A, Sink Driver — 1.2 1.4 V

OUT

I

= 2 A, Sink Driver — 1.7 1.9 V

OUT

I

= -1 A, Source Driver — 1.7 1.9 V

OUT

I

= -2 A, Source Driver — 2.0 2.2 V

OUT

I

= ±2 A, L = 3.5 mH, Note 2 50 — — V

OUT

I

= -2 A — 500 — ns

OUT

I

= -2 A — 750 — ns

OUT

I

= ±2 A — 2.5 — µs

OUT

ENABLE

= 2.0 V, Note 2 — <5.0 50 µA

ENABLE

= 2.0 V, Note 2 — <-5.0 -50 µA

VR = 50 V — <5.0 50 µA

IF = 2 A — 1.5 2.0 V

V

ENABLE(1)

= V

ENABLE(2)

= 0.8 V — 30 35 mA

— — 0.8 V

2.0 — — V

V

PHASE

V

PHASE

or V

or V

= 0.8 V — -5.0 -25 µA

ENABLE

= 2.0 V — <1.0 10 µ A

ENABLE

ENABLE Input to Source Drivers — 0.4 1.0 µs

ENABLE Input to Source Drivers — 2.0 4.0 µs

= 2.0 V.

PHASE

www.allegromicro.com

2998

DUAL FULL-BRIDGE
MOTOR DRIVER

V

ENABLE

V

PHASE

+

I

OUT

–

INPUT

INPUT

t

pd

t

d

90%

t

90%

pd

0%
t

d

t

r

t

f

Dwg. WM-001

Dwg. WM-001

TYPICAL APPLICATION

2-PHASE BIPOLAR STEPPER MOTOR DRIVE

(Chopper Mode)

+5V

A

0

+5V

B

0

Dwg. No. A-12,454

Dwg. EP-025

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

Dimensions in Inches

(controlling dimensions)

2998

DUAL FULL-BRIDGE

MOTOR DRIVER

INDEX

AREA

0.065

0.035

0.020

1.260

1.240

0.775

0.765

0.245

0.225

0.180

0.155

MAX

0.055

0.045

ø

0.145

0.140

0.135

0.570

0.365

1

0.030

0.020

12

0.100

±0.010

0.540

0.290

0.023

0.018

MIN

0.100

0.080

0.070

Dwg. MP-007 in

www.allegromicro.com

NOTES: 1. Lead thickness is measured at seating plane or below.

2. Lead spacing tolerance is non-cumulative.

3. Exact body and lead configuration at vendor’s option within limits shown.

4. Lead gauge plane is 0.030” below seating plane.

5. Supplied in standard sticks/tubes of 15 devices.

2998

DUAL FULL-BRIDGE
MOTOR DRIVER

Dimensions in Millimeters

(for reference only)

INDEX

AREA

1.65

0.89

0.51

1

32.00

31.49

19.69

19.45

0.76

0.51

12

6.22

5.71

3.56

9.27

2.54

±0.254

3.94

3.68

4.57

MAX

ø

14.48

13.71

7.36

MIN

0.59

0.45

1.40

1.14

3.43

2.54

2.03

1.77

Dwg. MP-007 mm

NOTES: 1. Lead thickness is measured at seating plane or below.

The products described here are manufactured under one or more

U.S. patents or U.S. patents pending.

Allegro MicroSystems, Inc. reserves the right to make, from time to
time, such departures from the detail specifications as may be required
to permit improvements in the performance, reliability, or
manufacturability of its products. Before placing an order, the user is
cautioned to verify that the information being relied upon is current.

Allegro products are not authorized for use as critical components
in life-support devices or systems without express written approval.

The information included herein is believed to be accurate and
reliable. However, Allegro MicroSystems, Inc. assumes no responsi­bility for its use; nor for any infringement of patents or other rights of
third parties which may result from its use.

115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 [phone]

2. Lead spacing tolerance is non-cumulative.

3. Exact body and lead configuration at vendor’s option within limits shown.

4. Lead gauge plane is 0.762 mm below seating plane.

5. Supplied in standard sticks/tubes of 15 devices.