2918
DUAL FULL-BRIDGE
PWM MOTOR DRIVER
The A2918SWH and A2918SWV motor drivers are designed
to drive both windings of a bipolar stepper motor or bidirectionally
control two dc motors. All bridges are capable of sustaining 45 V and
include internal pulse-width modulation (PWM) control of the output
current to 1.5 A.
OUT
1A
1
2
OUT
2A
E
3
4
2
OUT
2B
5
For PWM current control, the maximum output current is
determined by the user’s selection of a reference voltage and sensing
resistor. A PHASE input to each bridge determines load current
direction. Active low ENABLE inputs control the four drivers in
each bridge.
LOAD SPLY
SENSE
6
7
8
2
ENABLE
2
PHASE
2
9
RC
2
10
11
GROUND
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.
LOGIC SPLY
12
13
RC
1
PHASE
1
ENABLE
14
1
REFERENCE
SENSE
15
16
1
The A2918SWH/V are supplied in an 18-lead power-tab package
with staggered lead forming. The tab is internally insulated from the
device and requires no external isolation. The A2918SWH/V 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.
OUT
1B
17
18
E
1
Dwg. PP-051
ABSOLUTE MAXIMUM RATINGS
at TJ ≤ +150°C
FEATURES
Motor Supply Voltage, VBB . . . . . . . . . 45 V
I
1.5 A Continuous Output Current
Output Current, IOUT (tw≤20 µs) . .
1.75 A
1.5 A
I 45 V Output Sustaining Voltage
I Internal PWM Current Control
I Low Output Saturation Voltage
I Internal Clamp Diodes
(Continuous) . . . . . . . . . . . . . .
Logic Supply Voltage, VCC . . . . . . . . . 7.0 V
Logic Input Voltage Range,
VIN . . . . . . . . . . . . . . . -0.3 V to +7.0 V
Output Emitter Voltage, VE . . . . . . . . . 1.5 V
I Internal Thermal Shutdown Circuitry
I Similar to Dual PBL3718 or Dual PBL3770
Package Power Dissipation,
PD . . . . . . . . . . . . . . . . . . . . See Graph
Operating Temperature Range,
TA . . . . . . . . . . . . . . . . -20°C to +85°C
Storage Temperature Range,
TS . . . . . . . . . . . . . . . -40°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.
Always order by complete part number:
Part Number Application
A2918SWH
A2918SWV
For Horizontal Mount
For Vertical Mount