34923

Notes
1. Output current rating may be limited by duty cycle, ambient temperature, and heatsinking. Under any set of conditions, do not exceed the specified current rating or a junction temperature of 150°C.
2. Maximum power dissipation at indicated ambient temperature in free air with no heatsink used.
3. Per SEMI G42-88 specification.
4. ESD1 testing is performed in accordance with the Human Body Model (C_ZAP = 100 pF, R_ZAP = 1500 ).
5. ESD2 testing is performed in accordance with the Machine Model (C_ZAP = 200 pF, R_ZAP = 0 ).
6. Lead soldering temperature limit is for 10 seconds maximum duration. Not designed for immersion soldering. Exceeding these limits may cause malfunction or permanent damage to the device.

Designed with Motorola's advanced SMARTMOS, the 34923 is designed for pulse-width modulated (PWM) current control of DC motors. It is capable of continuous output currents up to 2.0 A and operating voltages of up to 45 V. Internal fixed off-time PWM current-control timing circuitry can be programmed via a serial interface to operate in slow, fast, and mixed current-decay modes.

DIR and PWM/ENABLE input pins are provided for use in controlling the speed and direction of a DC motor with externally applied PWM-control signals. The PWM/ENABLE input can be programmed via the serial port to PWM the bridge in fast or slow current decay. Internal synchronous rectification control circuitry is provided to reduce power dissipation during PWM operation.

Internal circuit protection includes thermal shutdown with hysteresis and crossover-current protection. A special power-up sequencing is not required.