LM74704QDDFRQ1

Overview

The LM74704QDDFRQ1 is an automotive-grade ideal diode controller designed for high-voltage applications. It operates with a supply voltage range of 3.2 V to 65 V and features a startup threshold of 3.9 V. The device supports a maximum input voltage of 65 V and withstands reverse voltages down to -65 V. It delivers a peak gate discharge current of 2.3 A and maintains a quiescent current of 80 µA when enabled. The forward voltage drop is regulated to 20 mV, with a reverse current blocking response time of less than 0.75 µs. It is housed in an SOT-23-THIN-8 package and functions within a temperature range of -40°C to +125°C.

Feature Summary

• Provides low-loss reverse polarity protection by regulating the forward voltage drop to 20 mV when driving external N-channel MOSFETs.
• Ensures zero DC reverse current flow through active regulation, enabling normal MOSFET shutdown during reverse current events.
• Features a charge pump gate driver for external N-channel MOSFETs, supporting wide input voltage ranges suitable for automotive battery systems.

Applications

• Automotive ADAS Systems - Camera
• Automotive Infotainment Systems
• Body Electronics and Lighting

Procurement Notes

Verify the specific suffix 'DDFRQ1' against the manufacturer's official datasheet to confirm pinout compatibility and functional specifications. Ensure the component meets AEC-Q100 Grade 1 requirements for your target operating temperature range. Confirm that the SOT-23-THIN-8 package dimensions align with your PCB footprint design guidelines before finalizing procurement.

Selection Notes

Select this controller when designing redundant power supplies or ORing applications requiring fast reverse current blocking. It is suitable for systems needing protection against ISO7637 transients and cold-start conditions due to its 3.2 V minimum input capability. Consider the external MOSFET selection carefully, as the controller drives the gate rather than integrating the switch.

Part Context

This component belongs to the LM74704-Q1 family of ideal diode controllers from Texas Instruments. It is part of the specialized PMIC category aimed at automotive electronics. The device complements evaluation modules like the LM74704Q1EVM, which are used to assess performance in ADAS and infotainment environments.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Verify cross-references directly with Texas Instruments technical support or authorized distributors for equivalent automotive-grade ideal diode controllers.