LM74502DDFR

Overview

The LM74502DDFR is a hot-swap voltage controller from Texas Instruments, designed for industrial applications with an input range of 3.2V to 65V. It features a TSOT-23-8 package and supports N-channel FETs in a 1:1 ratio configuration. The device operates within a temperature range of -40°C to 125°C and draws a supply current of 45 µA. Key timing parameters include a turn-on delay of 2 µs and a turn-off delay of 75 µs. It provides a maximum output current capability of 2.37A and functions as an ORing controller.

Feature Summary

• Drives external back-to-back N-channel MOSFETs to simulate ideal diode rectifier functionality
• Integrates power path on/off control and overvoltage protection mechanisms
• Supports industrial-grade reverse polarity protection capabilities

Applications

• Industrial system power distribution
• Hot-swap circuit implementations
• Ideal diode rectifier simulation

Procurement Notes

Verify the specific ordering suffix DDFR corresponds to the TSOT-23-8 thin package and reel/cut tape availability. Confirm that the component meets RoHS3 specifications and MSL level 1 requirements for your assembly process. Ensure the 3.2V to 65V input range aligns with your system's power architecture before finalizing procurement.

Selection Notes

Select this controller when designing systems requiring robust hot-swap protection and ideal diode behavior for N-channel MOSFETs. It is suitable for applications needing precise turn-on and turn-off delays to manage inrush currents. Consider the 45 µA supply current for low-power standby requirements and the wide operating temperature range for harsh environments.

Part Context

This component belongs to the LM74502 series of ideal diode controllers. It is distinct from evaluation modules like the LM74502EVM, which are used for testing rather than integration. The part serves as a core power management IC for protecting downstream loads during insertion or removal events.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Verify compatibility with existing gate drive circuits if considering alternative controllers within the same family.

FAQ

What type of MOSFETs does the LM74502DDFR drive?

It drives external N-channel MOSFETs configured in a back-to-back arrangement.

Does the LM74502DDFR have an internal switch?

No, it is a controller that requires external MOSFETs for power switching.