A3946KLPTR

Overview

The A3946KLPTR-T is a half-bridge power MOSFET controller manufactured by Allegro MicroSystems. It operates within a supply voltage range of 7V to 60V and supports an ambient operating temperature from -40°C to 135°C. The device is housed in a 16-eTSSOP-EP package with a bare pad for thermal management. Designed for brushless DC (BLDC) motors, it integrates on-chip charge pump technology to ensure high-current gate drive capability for N-channel MOSFETs. Key protection features include overtemperature and undervoltage lockout mechanisms.

Feature Summary

• Integrates an on-chip charge pump to enable operation with a minimum input supply voltage of 7V while maintaining high-current gate drive performance.
• Features bootstrapped gate drive architecture combined with the charge pump to support 100% duty cycle operation for efficient motor control.
• Includes built-in overtemperature protection and undervoltage protection circuits to safeguard the connected power MOSFETs during fault conditions.

Applications

• Brushless DC (BLDC) motor commutation and direction management
• General-purpose half-bridge power switching applications
• Industrial motor control systems requiring robust thermal performance

Procurement Notes

Verify that the specific part number suffix matches the required packaging format, as the base model may be obsolete or discontinued. Confirm RoHS compliance status, as earlier versions like the non-T variant may not meet current environmental standards. Check for parameter equivalence if substituting with the active A3946KLPTR-T variant. Ensure the procurement channel provides official datasheets and component authenticity guarantees to avoid counterfeit risks.

Selection Notes

Select this component when designing BLDC motor drivers that require a wide input voltage range up to 60V. The integrated charge pump eliminates the need for external bootstrap components, simplifying the circuit design. Consider the 16-pin TSSOP package with exposed pad for optimal heat dissipation in compact layouts. Verify that the target application does not exceed the specified 135°C junction temperature limit under maximum load conditions.

Part Context

The A3946 series represents Allegro MicroSystems' portfolio of half-bridge controllers optimized for motor drive applications. This specific model focuses on providing reliable gate driving for N-channel MOSFETs without complex external biasing requirements. It serves as a core component in motion control solutions where efficiency and protection are critical. The family shares common architectural traits but varies in pin count and voltage ratings to suit different motor sizes.

Replacement Considerations

• A3946KLPTR-T