The A4940 is a full-bridge controller used with N-channel power MOSFETs and is specifically designed for automotive applications using high power inductive loads such as DC brush motors.
Unique charge pump regulator provides complete (>10 V)Gate driversto handle battery voltages as low as 7 V and to allow the A4940 to operate when the gate driver voltage drops to 5.5 V.
The bootstrap capacitor is used to provide the above battery supply voltage required for the N-channel MOSFET. A unique bootstrap charge management system ensures that the bootstrap capacitor is always fully charged to supply the high-side gate driver circuitry.
The user-configurable inductive time of the external resistor independently controls each power MOSFET and protects it 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). The packages are lead (Pb) free and feature 100% matte tin plating (suffix –T).
- N-channel MOSFET full-bridge high-current gate driver
- Each MOSFET is controlled independently
- The charge pump operates at low supply voltages
- Cross-conduction protection with adjustable inductive time
- 5.5 to 50 V supply voltage range
- Diagnostic output
- Low current sleep mode