A3959: DMOS Full-Bridge PWM Motor Driver

Description

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).

The A3959SB-T package variant is discontinued. Samples are no longer available. Date of status change: June 1, 2016.

Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to the A3959SLPTR-T and A3959SLBTR-T.

Top Features

  • ±3 A, 50 V Output Rating
  • Low rDS(on) Outputs (270 milliohms, Typical)
  • Mixed, Fast, and Slow Current-Decay Modes
  • Synchronous Rectification for Low Power Dissipation
  • Internal UVLO and Thermal-Shutdown Circuitry
  • Crossover-Current Protection
  • Internal Oscillator for Digital PWM Timing

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
A3959SB-T 24-lead DIP -20°C to 85°C Yes View Data Discontinued Contact your
local sales rep
Check
Distributor Stock
A3959SLBTR-T 24-lead SOIC -20°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A3959SLPTR-T 28-lead TSSOP -20°C to 85°C Yes View Data Contact your
local sales rep
Check
Distributor Stock

Allegro’s products are not to be used in any devices or systems, including but not limited to life support devices or systems, in which a failure of Allegro’s product can reasonably be expected to cause bodily harm.

Packaging

The A3959SB/SLB/SLP is a choice of three power packages:

24-pin plastic DIP with a copper batwing tab (package suffix 'B'); Thin (<1.2 mm) 28-lead plastic TSSOP with an exposed thermal pad (suffix 'LP')

B and LP package combined

24-lead plastic SOIC with a copper batwing tab (package suffix 'LB')  

LB-Batwing SOIC 24 pin

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).