The A4940 is a full-bridge controller used with N-channel power MOSFETs specifically designed for automotive applications using high-power inductive loads such as DC brush motors.
The unique charge-pumped regulator provides a complete (>10 V) gate driver to handle battery voltages as low as 7 V and allows the A4940 to operate when the gate driver voltage drops to 5.5 V.
Bootstrap capacitors are used to provide the battery supply voltage described above required by N-channel MOSFETs. The unique bootstrap charge management system ensures that bootstrap capacitors are always fully charged to supply high-end gate driver circuitry.
The user-configured no-inductive time of the external resistor independently controls the individual power MOSFETs and protects them from breakdown.
Integrated diagnostics indicate undervoltage and overtemperature faults.
The A4940 is available in a 24-pin TSSOP power package with an exposed heatsink for enhanced thermal functionality (package type LP). They are all lead-free and 100% matte tin plated (suffix –T).
-
N 通道 MOSFET 全桥式大电流门极驱动器
-
各 MOSFET 独立控制
-
电荷泵供低电源电压运行
-
通过可调无感时间进行交叉传导保护
-
5.5 至 50 V 电源电压范围
-
诊断输出
-
低电流休眠模式