A4957 Overview
The A4957 is a full-bridge controller for use with external N-channel power MOSFETs and is specifically designed for 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 A4957 to operate with a reduced gate drive, down to 4.5 V. A bootstrap capacitor is used to provide the above battery...
A4957 Key Features
- High-current gate drive for N-channel MOSFET full bridge
- Independent control of each MOSFET
- Charge pump for low supply voltage operation
- Cross-conduction protection with adjustable dead time
- 4.5 to 50 V supply voltage range
- Diagnostics output
- Low current sleep mode