The A3940KLP and A3940KLW are designed specifically for automotive applications that require high-power motors. Each provides four high-current gate drive outputs capable of driving a wide range of n-channel power MOSFETs in a full-bridge configuration. Bootstrap capacitors are utilized to provide the above-battery supply voltage required for n-channel FETs. An internal charge pump for the high side allows for dc (100% duty cycle) operation of the bridge. Protection features include supply under/overvoltage, thermal shutdown, and motor lead short-to-battery and short-to-ground fault notification, and a programmable dead-time adjustment for cross- conduction prevention. The overvoltage trip point is user adjustable. The A3940 is supplied in a choice of two power packages, a 28- lead TSSOP with an exposed thermal pad (suffix LP), and a 28-lead wide-body SOIC (suffix LW).
The A3940 is a full-bridge power MOSFET controller designed specifically for automotive applications requiring high-power motors. It provides four high-current gate drive outputs capable of driving a wide range of n-channel power MOSFETs in a full-bridge configuration. The device utilizes bootstrap capacitors to provide above-battery supply voltage for n-channel FETs and includes an internal charge pump for high-side operation, allowing for 100% duty cycle operation of the bridge.
| Load Supply Voltage Range (VBB) | -0.6 V to +40 V |
|---|---|
| Operating Temperature Range | -40°C to +135°C |
| Junction Temperature | +150°C |
| VREG13 Output Voltage (Typical) | 13.3 V |
| Thermal Shutdown Temperature | 172°C |
The device operates from -40°C to +135°C.
Yes, the internal charge pump allows for dc (100% duty cycle) operation of the bridge.
Features include supply under/overvoltage, thermal shutdown, and motor lead short-to-battery and short-to-ground fault notification.