2919

DUAL FULL-BRIDGE

MOTOR DRIVER

DUAL FULL-BRIDGE

PWM MOTOR DRIVER

A2919SB

ABSOLUTE MAXIMUM RATINGS

at T

Motor Supply Voltage, V

Output Current, I

OUT

(Peak, t

(Continuous) .......................... ±750 mA

Logic Supply Voltage, V

Logic Input Voltage Range,

V

Output Emitter Voltage, V

Package Power Dissipation,

P

Operating Temperature Range,

T

Storage Temperature Range,

T

Output current rating may be limited by duty cycle,

ambient temperature, and heat sinking. Under any

set of conditions, do not exceed the specified

peak current rating or a junction temperature of

+150°C.

The A2919SB and A2919SLB motor drivers are designed to drive

both windings of a bipolar stepper motor or bidirectionally control two dc

motors. Both bridges are capable of sustaining 45 V and include

internal pulse width modulation (PWM) control of the output current to

750 mA. The outputs have been optimized for a low output-saturation

voltage drop (less than 1.8 V total source plus sink at 500 mA).

For PWM current control, the maximum output current is deter-

mined by the user’s selection of a reference voltage and sensing

resistor. Two logic-level inputs select output current limits of 0%, 41%,

67%, or 100% of the maximum level. A PHASE input to each bridge

determines load current direction.

The bridges include both ground clamp and flyback diodes for

protection against inductive transients. Internally generated delays

prevent crossover currents when switching current direction. Special

power-up sequencing is not required. Thermal protection circuitry

disables the outputs if the chip temperature exceeds safe operating

limits.

The A2919SB is supplied in a 24-pin dual in-line plastic batwing

package with a copper lead-frame and heat sinkable tabs for improved

power dissipation capabilities. The A2919SLB is supplied in a 24-lead

surface-mountable SOIC. Their batwing construction provides for

maximum package power dissipation in the smallest possible construc-

tion. The A2919SB/SLB are available for operation from -40°C to

+85°C. To order, change the suffix from 'S–' to 'E–'. These devices are

also available on special order for operation to +125°C. For applica-

tions not requiring quarter-step operation, but desire lower detent or

running current, the similar UDN2916B/EB/LB may be preferred.

FEATURES

■

750 mA Continuous Output Current

■

45 V Output Sustaining Voltage

■

Internal Clamp Diodes

■

Internal PWM Current Control

■

Low Output Saturation Voltage

■

Internal Thermal Shutdown Circuitry

■

Half- or Quarter-Step Operation of Bipolar Stepper Motors

2919

1

2

3

4

5

6

7

8

9

24

23

22

21

20

19

18

17

16

15

14

13

12

11

10

9

θ

2

θ

1

V

CC

2

1

GR OUND

GR OUND

GR OUND

GR OUND

02

I

12

I

2

RC

1

RC

V

RE F 1

11

I

2B

OUT

2

E

2A

OUT

1A

OUT

1

E

1B

OUT

01

I

LOAD

S UPPLY

LOG IC

S UPPLY

Dwg. PP-005