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Product Detailed Parameters
- Description：IC MOTOR DRIVER 5.5V-50V 28TSSOP
- Series：-
- Mfr：Allegro MicroSystems
- Package：Tape & Reel (TR),Cut Tape (CT)
- Motor Type - Stepper：-
- Motor Type - AC, DC：Brushed DC
- Function：Controller - Commutation, Direction Management
- Output Configuration：Pre-Driver - Half Bridge (2)
- Interface：PWM
- Technology：Power MOSFET
- Step Resolution：-
- Applications：-
- Current - Output：-
- Voltage - Supply：5.5V ~ 50V
- Voltage - Load：-
- Operating Temperature：-40°C ~ 150°C (TA)
- Mounting Type：Surface Mount
- Package / Case：28-TSSOP (0.173", 4.40mm Width) Exposed Pad
- Supplier Device Package：28-TSSOP-EP
- Grade：Automotive
- Qualification：-
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Overview
The A3941KLPTR-T is a full-bridge MOSFET driver designed for brushed DC motor applications. It operates with an external N-channel power MOSFETs and supports a supply voltage range of 5.5V to 50V. The device features a unique charge pump regulator that provides full gate drive (greater than 10V) even at battery voltages as low as 7V, enabling operation with reduced gate drive down to 5.5V. It includes integrated diagnostic functions for under-voltage, over-temperature, and power bridge fault indication. The component is housed in a 28-TSSOP package with an exposed pad and is rated for automotive use within a temperature range of -40°C to 150°C.
Feature Summary
- Integrated charge pump regulator enables full gate drive for N-channel MOSFETs at low battery voltages and supports 100% duty cycle operation.
- Configurable decay modes allow selection between fast and slow decay via diode or synchronous rectification for flexible motor control strategies.
- Built-in diagnostic outputs provide real-time status indication for under-voltage, thermal conditions, and power bridge faults.
- Adjustable dead time design prevents cross-conduction and protects power FETs from short-circuit damage.
Applications
- Automotive seat adjustment systems
- Windshield wiper motor drives
- Fluid pump control circuits
Procurement Notes
Verify the specific suffix KLPTR-T against the manufacturer's current datasheet to confirm pinout and electrical specifications match the design requirements. Ensure compliance with RoHS3 standards and check moisture sensitivity level (MSL 2) handling procedures during assembly. Confirm automotive grade qualification if operating in harsh environments.
Selection Notes
Select this component when designing brushed DC motor controllers requiring wide input voltage tolerance and robust protection features. It is suitable for applications needing precise direction management and commutation control. Consider the 28-TSSOP-EP package for thermal performance in space-constrained automotive layouts.
Part Context
This part belongs to the Allegro A394x series of motor drivers. It serves as a successor or alternative to older models like the A3940, offering extended voltage ranges and enhanced diagnostic capabilities. The series is tailored for automotive electronics demanding high reliability and functional safety.
Replacement Considerations
The A3940KLPTR-T is listed as a discontinued substitute option. Verify compatibility regarding voltage ranges and pin configurations before replacement.
