A4930: Single Phase Fan Pre-Driver

Description

Designed for pulse width modulated (PWM) current control of single phase brushless fans, the A4930 minimizes external component count and integrates all the key features required for high-current fans. Internal synchronous rectification control circuitry is provided to improve power dissipation in the external MOSFETs during PWM operation. Internal circuit protection includes thermal shutdown with hysteresis, rotor lock, and dead time protection.

The A4930 is supplied in a 0.90 nominal overall height, 5 mm × 5 mm, 28-pin QFN with exposed thermal pad, (suffix ET). It is lead (Pb) free with 100% matte tin leadframe plating.

Top Features

  • Synchronous rectification for low power dissipation
  • Drives four N-channel MOSFETs
  • Internal UVLO and thermal shutdown circuitry
  • Hall element input
  • PWM current limiting
  • Dead time protection
  • FG output
  • RD output
  • Lock detect protection
  • High VBB absolute maximum
  • Soft start
  • A4930GETTR-T AEC-Q100 qualified

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
A4930GETTR-C-T 28-lead QFN -20°C to 105°C Yes View Data Contact your
local sales rep
Check
Distributor Stock
A4930GETTR-T 28-lead QFN -40°C to 105°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 A4930 is supplied in a 0.90 nominal overall height, 5 mm × 5 mm, 28-pin QFN with exposed thermal pad, (suffix ET).  It is lead (Pb) free with 100% matte tin leadframe plating.

 ET QFN with exposed pad 28 lead