Designed for pulse-width modulated (PWM) current control of dc motors, the A3959SB, A3959SLB, and A3959SLP are capable of output currents to ±3 A and operating voltages to 50 V. Internal fixed off-time PWM current-control timing circuitry can be adjusted via control inputs to operate in slow, fast, and mixed current-decay modes.

PHASE and ENABLE input terminals are provided for use in controlling the speed and direction of a dc motor with externally applied PWM-control signals. Internal synchronous rectification control circuitry is provided to reduce power dissipation during PWM operation.

Internal circuit protection includes thermal shutdown with hysteresis, undervoltage monitoring of supply and charge pump, and crossover-current protection. Special power-up sequencing is not required.

The A3959SB/SLB/SLP is a choice of three power packages, a 24-pin plastic DIP with a copper batwing tab (package suffix 'B'), a 24-lead plastic SOIC with a copper batwing tab (package suffix 'LB'), and a thin (<1.2 mm) 28-lead plastic TSSOP with an exposed thermal pad (suffix 'LP'). In all cases, the power tab is at ground potential and needs no electrical isolation. Each package is available in a leadfree version (100% matte tin leadframe).

 

Part Number	Package Type	RoHS	Temperature
		Compliant
A3959SB	24-pin DIP	No	-20 °C to  85 °C
A3959SB-T	24-pin DIP	Yes	-20 °C to  85 °C
A3959SLB	24-lead SOIC	No	-20 °C to  85 °C
A3959SLB-T	24-lead SOIC	Yes	-20 °C to  85 °C
A3959SLBTR	24-lead SOIC	No	-20 °C to  85 °C
A3959SLBTR-T	24-lead SOIC	Yes	-20 °C to  85 °C
A3959SLP	28-lead TSSOP	No	-20 °C to  85 °C
A3959SLP-T	28-lead TSSOP	Yes	-20 °C to  85 °C
A3959SLPTR	28-lead TSSOP	No	-20 °C to  85 °C
A3959SLPTR-T	28-lead TSSOP	Yes	-20 °C to  85 °C