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Ideal diode/ORing controllers

LM7481

ACTIVE

3-V to 65-V back-to-back NFET ideal diode controller with high gate drive, -55°C to 125°C

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Data sheet

LM7481

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 3 Vin (max) (V) 65 Number of channels 1 Features Automotive load dump compatibility, Inrush current control, Linear control, Overvoltage protection, Reverse current blocking, Reverse polarity protection Iq (typ) (mA) 0.428 Iq (max) (mA) 0.5 FET External back-to-back FET IGate source (typ) (µA) 60000 IGate sink (typ) (mA) 1500 IGate pulsed (typ) (A) 2.6 Operating temperature range (°C) -55 to 125 VSense reverse (typ) (mV) -4.5 Design support EVM, Simulation Model Rating Catalog Imax (A) 350 VGS (max) (V) 15 Shutdown current (ISD) (mA) (A) 0.003 Device type Ideal diode controller Product type Ideal diode controller
Vin (min) (V) 3 Vin (max) (V) 65 Number of channels 1 Features Automotive load dump compatibility, Inrush current control, Linear control, Overvoltage protection, Reverse current blocking, Reverse polarity protection Iq (typ) (mA) 0.428 Iq (max) (mA) 0.5 FET External back-to-back FET IGate source (typ) (µA) 60000 IGate sink (typ) (mA) 1500 IGate pulsed (typ) (A) 2.6 Operating temperature range (°C) -55 to 125 VSense reverse (typ) (mV) -4.5 Design support EVM, Simulation Model Rating Catalog Imax (A) 350 VGS (max) (V) 15 Shutdown current (ISD) (mA) (A) 0.003 Device type Ideal diode controller Product type Ideal diode controller
WSON (DRR) 12 9 mm² 3 x 3
  • Qualified for extended temperature applications
    • Device temperature: –55°C to +125°C ambient operating temperature range
  • 3-V to 65-V input range
  • Reverse input protection down to –65 V
  • Drives external back to back N-channel MOSFETs
  • Ideal diode operation with 9.1-mV A to C forward voltage drop regulation
  • Low reverse detection threshold (–4 mV) with fast response (0.5 µs)
  • Active rectification up to 200-KHz
  • 60-mA peak gate (DGATE) turn-on current
  • 2.6-A peak DGATE turnoff current
  • Integrated 3.8-mA charge pump
  • Adjustable overvoltage protection
  • Low 2.87-µA shutdown current (EN/UVLO=Low)
  • 2.6-A peak DGATE turn-off current
  • Meets automotive ISO7637 transient requirements with a suitable TVS diode
  • Available in space saving 12-pin WSON package
  • Qualified for extended temperature applications
    • Device temperature: –55°C to +125°C ambient operating temperature range
  • 3-V to 65-V input range
  • Reverse input protection down to –65 V
  • Drives external back to back N-channel MOSFETs
  • Ideal diode operation with 9.1-mV A to C forward voltage drop regulation
  • Low reverse detection threshold (–4 mV) with fast response (0.5 µs)
  • Active rectification up to 200-KHz
  • 60-mA peak gate (DGATE) turn-on current
  • 2.6-A peak DGATE turnoff current
  • Integrated 3.8-mA charge pump
  • Adjustable overvoltage protection
  • Low 2.87-µA shutdown current (EN/UVLO=Low)
  • 2.6-A peak DGATE turn-off current
  • Meets automotive ISO7637 transient requirements with a suitable TVS diode
  • Available in space saving 12-pin WSON package

The LM74810 ideal diode controller drives and controls external back to back N-channel MOSFETs to emulate an ideal diode rectifier with power path ON/OFF control and overvoltage protection. The wide input supply of 3V to 65V allows protection and control of 12-V and 24-V input powered systems. The device can withstand and protect the loads from negative supply voltages down to –65-V. An integrated ideal diode controller (DGATE) drives the first MOSFET to replace a Schottky diode for reverse input protection and output voltage holdup. With a second MOSFET in the power path the device allows load disconnect (ON/OFF control) and overvoltage protection using HGATE control. The device features an adjustable overvoltage cut-off protection feature. LM74810 employs reverse current blocking using linear regulation and comparator scheme. With common drain configuration of the power MOSFETs, the mid-point can be utilized for OR-ing designs using another ideal diode. The LM74810 has a maximum voltage rating of 65V. The loads can be protected from extended overvoltage transients like 200-V unsuppressed load dumps in 24-V battery systems by configuring the device with external MOSFETs in common source topology.

The LM74810 ideal diode controller drives and controls external back to back N-channel MOSFETs to emulate an ideal diode rectifier with power path ON/OFF control and overvoltage protection. The wide input supply of 3V to 65V allows protection and control of 12-V and 24-V input powered systems. The device can withstand and protect the loads from negative supply voltages down to –65-V. An integrated ideal diode controller (DGATE) drives the first MOSFET to replace a Schottky diode for reverse input protection and output voltage holdup. With a second MOSFET in the power path the device allows load disconnect (ON/OFF control) and overvoltage protection using HGATE control. The device features an adjustable overvoltage cut-off protection feature. LM74810 employs reverse current blocking using linear regulation and comparator scheme. With common drain configuration of the power MOSFETs, the mid-point can be utilized for OR-ing designs using another ideal diode. The LM74810 has a maximum voltage rating of 65V. The loads can be protected from extended overvoltage transients like 200-V unsuppressed load dumps in 24-V battery systems by configuring the device with external MOSFETs in common source topology.
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* Data sheet LM7481 3-V to 65-V Ideal Diode Controller Driving Back to Back NFETs datasheet PDF | HTML 22 Dec 2022

Design & development

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Evaluation board

LM74810EVM — LM7481-Q1 ideal diode controller evaluation module

TI's Evaluation Module LM74810EVM helps designers evaluate the operation and performance of the LM7481-Q1 ideal diode controllers (LM74810QDRR) in reverse battery protection applications. This evaluation module demonstrates LM7481-Q1 Ideal Diode controller's capability to provide reverse battery (...)
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Calculation tool

FET-INRUSH-SOA-CALC — FET SOA margin calculator for dvdt based startup

The design calculator allows user to estimate the FET SOA margin while starting up with dVdt based startup for inrush current control
Supported products & hardware

Supported products & hardware

Products
Ideal diode/ORing controllers
LM7481-Q1 — Automotive ideal diode controller with active rectification driving B2B NFETs LM7481 — 3-V to 65-V back-to-back NFET ideal diode controller with high gate drive, -55°C to 125°C LM74502-Q1 — Automotive reverse polarity protection controller, overvoltage protection, gate drive strength 60 μA LM74502 — 3.2-V to 65-V industrial RPP controller with load disconnect and OVP LM74502H — 3.2-V to 65-V industrial RPP controller with load disconnect, OVP, and high gate drive LM74502H-Q1 — Automotive reverse polarity protection controller, overvoltage protection, gate drive strength 11 mA LM74720-Q1 — Automotive, low IQ ideal diode controller with active rectification and load dump protection LM74721-Q1 — Automotive, TVS less low IQ reverse battery protection ideal diode controller, active rectification LM74722-Q1 — Automotive, low IQ ideal diode controller with 200-khz active rectification and load dump protection LM7480-Q1 — 3-V to 65-V, automotive ideal diode controller driving back to back NFETs LM7480 — 3-V to 65-V back-to-back NFET ideal diode controller, -55°C to 125°C
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PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
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