A5957: Full-Bridge PWM Gate Driver

Description

LAST-TIME BUY: This part is in production but has been determined to be LAST TIME BUY. This classification indicates that the product is obsolete and notice has been given. Sale of this device is currently restricted to existing customer applications. The device should not be purchased for new design applications because of obsolescence in the near future. Samples are no longer available. Date of status change: July 1, 2019. Deadline for receipt of LAST TIME BUY orders: December 27, 2019.

Recommended Substitutions: For existing customer transition, and for new customers or new applications, refer to A4955 and A4956.

Designed for pulse-width-modulated (PWM) control of DC motors, the A5957 is capable of 50 V operation and provides gate drive for an all N-channel external MOSFET bridge.

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 lower power dissipation during PWM operation.

Internal circuit protection includes VDS protection, thermal shutdown with hysteresis, undervoltage monitoring of VBB, and crossover-current protection.

The A5957 is supplied in a low-profile, 4×4 mm, 20-contact QFN package (suffix “ES”) with exposed thermal pad.

Top Features

  • PHASE/ENABLE/SLEEPn control logic
  • Overcurrent indication
  • Adjustable off-time and blank-time
  • Adjustable current limit
  • Adjustable gate drive
  • Synchronous rectification
  • Internal UVLO
  • Crossover-current protection
  • MOSFET VDS protection
  • Voltage output proportional to load current

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
APEK5957ES-01-T DEMO BOARD -40°C to 85°C No -- Last time buy Contact your
local sales rep
Check
Distributor Stock
A5957GESTR-T 20-lead QFN -40°C to 105°C Yes View Data Last time buy 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

Package