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Introduction, characteristics, and applications of Texas Instruments LM74930-Q1 ideal diode controller

2/2/2024 9:10:27 AM

Summary: AEC-Q1 automotive qualified ideal diode with surge blocking capabilities.

LM74930-Q1 controller Texas Instruments

The Texas Instruments LM74930-Q1 ideal diode controller is an AEC-Q1 automotive qualified ideal diode with surge blocking capabilities. This diode controller drives back-to-back external n-channel mosfets, emulating an ideal diode rectifier and power path ON and OFF control with overcurrent and OVP. The LM74930-Q1 diode controller withstands and protects loads with negative supply voltages as low as -65V. The integrated high-side gate control (HGATE) drives the first MOSFET in the power path, allowing HGATE to be used to control load disconnection (ON and OFF control). DGATE drives a second MOSFET that replaces the Schottky diode for input reverse polarity protection and output voltage maintenance by blocking reverse current flow from output to input. The LM74930-Q1 diode controller includes an integrated current-sense amplifier that provides adjustable overcurrent and short-circuit protection with circuit breaker functionality. This ideal diode controller also features adjustable overvoltage and undervoltage protection to protect against power supply transients.

The LM74930-Q1 ideal diode controller is available in a space-saving 24-pin VQFN package. Typical applications include 12V/24V automotive reverse battery protection, industrial transportation, and redundant power supply ORing.


characteristic

  • AEC-Q100 qualified for automotive applications

  • -40℃~125℃ ambient operating temperature range (equipment temperature level 1)

  • Input voltage range 4V to 65V

  • Reverse input protection down to -65V

  • Driving external back-to-back n-channel mosfets in common source configuration

  • Ideal diode operation with 10.5mV A to C forward voltage drop regulation

  • Low reverse detection threshold (-10.5mV), fast DGATE shutdown response (0.5µs)

  • 18mA peak gate (DGATE) on current

  • 2.6A peak DGATE shutdown current

  • Overcurrent and short circuit protection adjustable

  • Analog current monitor output with 10% accuracy (IMON)

  • Overvoltage and undervoltage protection are adjustable

  • Low 2.5µA shutdown current (EN=Low)

  • The MODE pin allows bidirectional current to flow (MODE=Low)

  • Meets automotive ISO7637 transient requirements with suitable TVS diodes

  • Available in space-saving 24-pin VQFN package


app

  • 12V/24V car reverse battery protection

  • industrial transportation

  • Redundant power supply


Unsuppressed load dump 200V - output clamped



Functional block diagram



Application circuit diagram


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