LM74700QDRQ1

Overview

The LM74700QDRQ1 is an automotive-grade ideal diode controller designed for low-loss reverse polarity protection and active OR-ing applications. It operates with external N-channel MOSFETs to achieve a regulated forward voltage drop of 20mV. The device supports a wide input voltage range from 3.2V to 65V, accommodating various DC bus voltages including automotive battery systems. It features a charge pump gate driver for external MOSFET control, ensuring zero DC reverse current flow. The component provides rapid reverse current blocking response in less than 0.75µs, suitable for ISO7637 pulse testing and power failure conditions.

Feature Summary

• Regulates forward voltage drop to 20mV using external N-channel MOSFETs
• Provides fast reverse current blocking response under 0.75µs
• Includes integrated charge pump gate driver for external MOSFET control
• Supports negative supply voltage down to -65V for robust protection

Applications

• Active OR-ing for redundant power systems
• Automotive ADAS camera systems
• Automotive infotainment head units
• Industrial factory automation PLCs
• Enterprise power supplies

Procurement Notes

Verify the specific suffix 'QDRQ1' against the official Texas Instruments datasheet to confirm the SOIC-8 package and tape-and-reel packaging configuration. Ensure the component meets AEC-Q100 Grade 1 qualification requirements for the target automotive application environment. Cross-reference the manufacturer part number with authorized distributor catalogs to validate authenticity and traceability before procurement.

Selection Notes

Select this controller when designing systems requiring low conduction loss and precise reverse current blocking. It is suitable for applications needing cold start support down to 3.2V input. Consider the SOIC-8 package constraints and thermal performance. Evaluate the need for external N-channel MOSFET selection based on the 2.3A peak gate discharge current capability and system voltage ratings up to 65V.

Part Context

The LM74700QDRQ1 belongs to the LM74700-Q1 family of ideal diode controllers from Texas Instruments. This series is engineered for high-voltage automotive and industrial power management. The QDRQ1 variant specifically denotes the qualified version with a DRQ1 marking code, housed in an SOIC-8 surface-mount package. It complements other PMIC solutions by providing efficient power path management without the losses associated with standard diodes.

Replacement Considerations

LM74700QDBVTQ1: Offers similar functionality in a smaller SOT-23-6 package with a 5A output current rating.