3965

1

Designed for Pulse Width Modulated (PWM) current control of low

voltage stepper motors, the A3965S is capable of output currents to

± 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

µA 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

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 ‘LB’).

FEATURES

±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

ABSOLUTE MAXIMUM RATINGS

at TA = +25°C

Load Supply Voltage, VBB ..........................20 V

Logic Input Voltage Range,

A3965SLB........................... 50

°C/W**

Operating Temperature Range,

Storage Temperature Range,

* 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

°C.

*Measured with 062" thick FR4, two sided PCB with 1 sq

inch copper area.

PRELIMINARY DATASHEET - 12/4/2002

(Subject to change without notice)

DMOS DUAL FULL-BRIDGE

PWM MOTOR DRIVER