The A3940KLP / A3940KLW Full-Bridge Power MOSFET Controller is specifically designed 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-pin TSSOP with an exposed thermal pad (package type LP), and a 28-pin wide-body SOIC (package type LW). Both package types are available in lead (Pb) free versions, with 100% matte-tin leadframe plating (suffix –T).
The A3940KLP and A3940KLW are full-bridge power MOSFET controllers specifically designed for automotive applications requiring high-power motors. Each device provides four high-current gate drive outputs capable of driving a wide range of n-channel power MOSFETs in a full-bridge configuration.
Key features include an internal charge pump that allows for 100% duty cycle operation, synchronous rectification, and comprehensive protection features such as supply under/overvoltage, thermal shutdown, and motor lead short-to-battery or ground fault notification. The devices are available in two power packages: a 28-pin TSSOP with an exposed thermal pad (A3940KLP) and a 28-pin wide-body SOIC (A3940KLW).
| Operating Temperature Range (TA) | -40°C to +135°C |
|---|---|
| Junction Temperature (TJ) | +150°C |
| Gate Drive Output Current (ICP) | 15 mA Typ |
| Thermal Shutdown Temperature | +172°C |
| VBB Undervoltage Threshold | 5.25 V Typ |
The device is supplied in a 28-pin TSSOP with an exposed thermal pad (A3940KLP) and a 28-pin wide-body SOIC (A3940KLW).
Yes, an internal charge pump for the high side allows for dc (100% duty cycle) operation of the bridge.
Protection includes supply under/overvoltage, thermal shutdown, and motor lead short-to-battery and short-to-ground fault notification.