2919
DUAL FULL-BRIDGE
MOTOR DRIVER
2919
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 cross-over 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
applications not requiring quarter-step operation, but desire lower
detent or running current, the similar UDN2916B/EB/LB may be pre-
ferred.
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
A2919SB
OUT
1A
OUT
2A
E
2
SENSE
2
OUT
2B
GROUND
GROUND
I
02
I
12
Data Sheet
29319.21
1
2
3
4
5
6
7
8
2
V
BB
24
23
LOAD
SUPPLY
E
1
SENSE
1
OUT
1B
I
01
GROUND
GROUND
I
11
PHASE
1
V
REF 1
RC
1
LOGIC
SUPPLY
1
22
21
20
19
18
17
PWM 1
9
9
10
11
12
θ
2
θ
1
16
15
14
PHASE
2
V
REF 2
RC
2
PWM 2
V
CC
13
Dwg. PP-005
ABSOLUTE MAXIMUM RATINGS
at T
J
≤
150°C
Motor Supply Voltage, V
BB
...................
45 V
Output Current, I
OUT
(Peak, t
w
≤
20
µs)
........................
±
1.0 A
(Continuous) ..........................
±
750 mA
Logic Supply Voltage, V
CC
...................
7.0 V
Logic Input Voltage Range,
V
IN
...............................
-0.3 V to +7.0 V
Output Emitter Voltage, V
E
..................
1.5 V
Package Power Dissipation,
P
D
.......................................
See Graph
Operating Temperature Range,
T
A
.................................
-20
°
C to +85
°
C
Storage Temperature Range,
T
S
...............................
-55
°
C to +150
°
C
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.
FEATURES
s
s
s
s
s
s
s
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
R
θJT
6.0°C/W
6.0°C/W
Always order by complete part number:
Part Number
Package
R
θJA
A2919SB
24-Pin DIP
40°C/W
A2919SLB
24-Lead SOIC
55°C/W
ALLEGRO [ ALLEGRO MICROSYSTEMS ]
