3965
PRELIMINARY DATASHEET - 12/4/2002
(Subject to change without notice)
DMOS DUAL FULL-BRIDGE
PWM MOTOR DRIVER
Designed for Pulse Width Modulated (PWM) current control of low
voltage stepper motors, the A3965S is capable of output currents to
鹵
500 mA
and operating voltages to 20 V.
The A3965 is particularly attractive for low power or battery
operated motors where minimal power consumption is desired. A SLEEP
mode disables all circuitry and typically draws less than 1碌A(chǔ) supply current
from motor and logic supply. During operation the fixed frequency ON
pulses of each H-bridge are 180 degrees out of phase to minimize the peak
demand required of the motor supply allowing savings in size and cost of
external power supply components.
PHASE and ENABLE input terminals are provided for use in
controlling the speed and direction of a stepper motor with externally applied
PWM control signals.
Internal circuit protection includes thermal shutdown with
hysteresis, undervoltage monitoring of V
DD
and charge pump, and crossover
current protection. Special power up sequencing is not required.
The A3965 is supplied in a 24-lead plastic SOIC with a copper
batwing tab (suffix 鈥楲B鈥?.
ABSOLUTE MAXIMUM RATINGS
at TA = +25擄C
Load Supply Voltage, VBB ..........................20
V
Output Current, I
OUT
............................
鹵500
mA*
Logic Supply Voltage, V
DD
..........................7.0
V
Logic Input Voltage Range,
V
IN
......................-0.3
V to V
DD
+ 0.3 V
(t
W
<30ns) ..................-1.0V
to V
DD
+1V
Sense Voltage, V
SENSE
..................................0.5
V
Reference Voltage, V
REF
.................................3
V
Package Power Dissipation (TA = +25擄C), P
D
A3965SLB...........................
50擄C/W**
Operating Temperature Range,
T
A
................................
-20擄C to +85擄C
Junction Temperature, T
J
.........................
+150擄C
Storage Temperature Range,
T
S
...............................
-55擄C to +150擄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 current rating or a
junction temperature of 150擄C.
*Measured with 062" thick FR4, two sided PCB with 1 sq
inch copper area.
FEATURES
鹵500 mA, 20 V Output Rating
2.85 to 5.5V Logic Supply Operation
Sleep Mode for Minimum Power Consumption
Fixed Frequency PWM
Offset On Pulses to Minimize Peak Supply Transient Currents
Internal UVLO and Thermal Shutdown Circuitry
Crossover-Current Protection
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