The A3921 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 A3921 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 A3921 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.
Allegro's A3921 is a Quality Managed (QM) product that has been developed according to the automotive quality requirements of TS 16949 and contains features targeted for automotive safety applications. This product can be qualified for use in accordance with ISO 26262 in compliant safety systems by ensuring a robust integration of the component into the system design. Safety documentation will be provided to support and guide the integration process.
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|Part Number||Package Type||Temperature||RoHS
|Part Composition /
|APEK3921KLP-01-T||DEMO BOARD||-20°C to 85°C||No||--||Contact your
local sales rep
|A3921KLPTR-T||28-lead TSSOP||-40°C to 125°C||Yes||View Data||Contact your
local sales rep