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Related Links:

Datasheets:
A3941: Automotive Full Bridge MOSFET Driver (PDF)

Selection Guides:
Power Integrated Circuits,

Automotive ICs,

Power Motor Drivers

when this product is updated

Press Releases:
A3941: Allegro MicroSystems, Inc. Announces A New Automotive Grade Full Bridge MOSFET Predriver IC

A3941
Automotive Full Bridge MOSFET Driver

Features

• High current gate drive for N-channel MOSFET full bridge
• High-side or low-side PWM switching
• Charge pump for low supply voltage operation
• Top-off charge pump for 100% PWM
• Cross-conduction protection with adjustable dead time
• 5.5 to 50 V supply voltage range
• Integrated 5 V regulator
• Diagnostics output
• Low current sleep mode

Description

The A3941 is a full-bridge controller for use with external N-channel power MOSFETs and is specifically designed for automotive applications with high-power inductive loads, such as brush DC motors.

A unique charge pump regulator provides full (>10 V) gate drive for battery voltages down to 7 V and allows the A3941 to operate with a reduced gate drive, down to 5.5 V.

A bootstrap capacitor is used to provide the above-battery supply voltage required for N-channel MOSFETs. An internal charge pump for the high-side drive allows DC (100% duty cycle) operation.

The full bridge can be driven in fast or slow decay modes using diode or synchronous rectification. In the slow decay mode, current recirculation can be through the high-side or the lowside FETs. The power FETs are protected from shoot-through by resistor adjustable dead time.

Integrated diagnostics provide indication of undervoltage, overtemperature, and power bridge faults, and can be configured to protect the power MOSFETs under most short circuit conditions.

The A3941 is supplied in a 28-pin TSSOP power package with an exposed thermal pad (suffix LP). This package is lead (Pb) free, with 100% matte-tin leadframe plating.

Functional Block Diagram

Complete Part Numbers

Part Number	Package Type	RoHS Compliant	Part Composition/ RoHS Data	Temperature	Comments	Samples	Distributor Stock
A3941KLP-T	28-lead TSSOP	Yes	view data	-40 °C to  125 °C	new	Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.
A3941KLPTR-T	28-lead TSSOP	Yes	view data	-40 °C to  125 °C	new	Due to warehouse relocation, samples will be unavailable until July 21, 2008. Contact your sales rep or purchase from distributor.

Allegro's products are not to be used in life support devices or systems, if a failure of an Allegro product can reasonably be expected to cause the failure of that life support device or system, or to affect the safety or effectiveness of that device or system.