A3940: Full-Bridge Power MOSFET Controller

Description

This part is discontinued. Samples are no longer available. Date of status change: August 30, 2017

For existing customer transition, and for new customers or new applications, refer to the A3941.

The A3940KLP and A3940KLW are designed specifically for automotive applications that require high-power motors. Each provides four high-current gate drive outputs capable of driving a wide range of n-channel power MOSFETs in a full-bridge configuration.

Bootstrap capacitors are utilized to provide the above-battery supply voltage required for n-channel FETs. An internal charge pump for the high side allows for dc (100% duty cycle) operation of the bridge.

Protection features include supply under/overvoltage, thermal shutdown, and motor lead short-to-battery and short-to-ground fault notification, and a programmable dead-time adjustment for crossconduction prevention. The overvoltage trip point is user adjustable.

The A3940 is supplied in a choice of two power packages, a 28-pin TSSOP with an exposed thermal pad (package type LP), and a 28-pin wide-body SOIC (package type LW). Both package types are available in lead (Pb) free versions, with 100 % matte-tin leadframe plating (suffix –T).

Top Features

  • Drives wide range of n-channel MOSFETs
  • Charge pump to boost gate drive at low-battery-input conditions
  • Bootstrapped gate drive with charge pump for 100% duty cycle
  • Synchronous rectification
  • Fault diagnostic output
  • Adjustable dead-time cross-conduction protection
  • Motor lead short-to-battery and short-to-ground protection
  • Undervoltage/overvoltage protection
  • -40°C to +150°C, TJ operation
  • Thermal shutdown

Part Number Specifications and Availability

Part Number Package Type Temperature RoHS
Compliant
Part Composition /
RoHS Data
Comments Samples Check Stock
A3940KLPTR-T 28-lead TSSOP -40°C to 135°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

The A3940 is supplied in a choice of two power packages, a 28-pin TSSOP with an exposed thermal pad (package type LP), and a 28-pin wide-body SOIC (package type LW). Both package types are available in lead (Pb) free versions, with 100 % matte-tin leadframe plating (suffix –T).

LP-eTSSOP 24 lead

 

Packages