A3946KLP-T

Overview

The A3946KLPTR-T is a half-bridge power MOSFET controller manufactured by Allegro MicroSystems. It operates with a supply voltage range of 7V to 60V and features an on-chip charge pump enabling 100% duty cycle operation. The device provides high-current gate drive outputs for N-channel MOSFETs, supporting applications such as high-power DC motors and brushless DC (BLDC) motors. It includes integrated overtemperature and undervoltage protection mechanisms. The component is housed in a 16-pin eTSSOP package with an exposed pad for thermal management.

Feature Summary

• Integrated on-chip charge pump allows for high-side gate drive at low input voltages
• Supports 100% duty cycle operation via bootstrapped gate drive configuration
• Provides high-current gate drive suitable for driving a wide range of N-channel MOSFETs
• Includes built-in overtemperature and undervoltage protection for system reliability

Applications

• High-power unidirectional DC motor drives
• Three-phase brushless DC (BLDC) motor control
• General-purpose inductive load switching

Procurement Notes

Verify the specific suffix against official datasheets to confirm package type and tape/reel specifications. Ensure compatibility with the target PCB footprint, particularly regarding the exposed thermal pad dimensions. Confirm RoHS compliance status and moisture sensitivity level requirements for the assembly process before procurement.

Selection Notes

Select this component when a half-bridge topology is required for driving external N-channel power MOSFETs. It is suitable for designs needing a minimum supply voltage of 7V and benefits from integrated charge pump functionality. Consider the 16-pin TSSOP package constraints and thermal dissipation requirements associated with the exposed pad design for optimal performance.

Part Context

This part belongs to the A3946 family of half-bridge controllers designed for robust motor control applications. It serves as a driver interface between logic-level control signals and high-power MOSFET switches. The device simplifies circuit design by integrating essential protection features and gate drive boosting capabilities within a compact surface-mount package.

Replacement Considerations

The A3946KLP is a pin-compatible lead-free variant. Verify functional equivalence and package dimensions before substitution.