A3940

• Drives wide range of n-channel MOSFETs
• Charge pump to boost gate drive at low-battery-input conditions
• Bootstrapped gate drive with charge pump for 100% duty cycle
• Synchronous rectification
• Fault diagnostic output
• Adjustable dead-time cross-conduction protection
• Motor lead short-to-battery and short-to-ground protection
• Undervoltage/overvoltage protection
• -40°C to +150°C, T_J operation
• Thermal shutdown

Description

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 of A3940 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 crossconduction 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).