A3921 Overview
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...
A3921 Key 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
- AEC-Q100 qualified