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LM7481-Q1

ACTIVE

Automotive ideal diode controller with active rectification driving B2B NFETs

Product details

Vin (min) (V) 3 Vin (max) (V) 65 Number of channels 2 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 TI functional safety category Functional Safety-Capable 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) -40 to 125 VSense reverse (typ) (mV) -4.5 Design support EVM, Simulation Model Rating Automotive 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 2 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 TI functional safety category Functional Safety-Capable 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) -40 to 125 VSense reverse (typ) (mV) -4.5 Design support EVM, Simulation Model Rating Automotive 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
  • AEC-Q100 qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature range
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C4B
  • 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 over voltage 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
  • AEC-Q100 qualified for automotive applications
    • Device temperature grade 1: –40°C to +125°C ambient operating temperature range
    • Device HBM ESD classification level 2
    • Device CDM ESD classification level C4B
  • 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 over voltage 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-Q1 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 over voltage protection. The wide input supply of 3 V to 65 V allows protection and control of 12-V and 24-V automotive battery powered ECUs. 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. A strong charge pump of 3.8 mA with 60-mA peak GATE source current driver stage and short turn ON and turn OFF delay times ensures fast transient response ensuring robust and efficient MOSFET switching performance during automotive testing such as ISO16750 or LV124 where an ECU is subjected to input short interruptions and AC superimpose input signals upto 200-KHz frequency. With a second MOSFET in the power path the device allows load disconnect (ON/OFF control) and over voltage protection using HGATE control. The device features an adjustable over voltage cut-off protection feature for load dump protection.

The LM74810-Q1 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 over voltage protection. The wide input supply of 3 V to 65 V allows protection and control of 12-V and 24-V automotive battery powered ECUs. 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. A strong charge pump of 3.8 mA with 60-mA peak GATE source current driver stage and short turn ON and turn OFF delay times ensures fast transient response ensuring robust and efficient MOSFET switching performance during automotive testing such as ISO16750 or LV124 where an ECU is subjected to input short interruptions and AC superimpose input signals upto 200-KHz frequency. With a second MOSFET in the power path the device allows load disconnect (ON/OFF control) and over voltage protection using HGATE control. The device features an adjustable over voltage cut-off protection feature for load dump protection.

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Technical documentation

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Type Title Date
* Data sheet LM7481-Q1 Ideal Diode Controller with Active Rectification and Load Dump Protection datasheet (Rev. A) PDF | HTML 07 Dec 2020
Functional safety information LM7481-Q1 Functional Safety FIT Rate, FMD, and Pin FMA PDF | HTML 05 Apr 2024
Application note Basics of Ideal Diodes (Rev. B) PDF | HTML 05 Oct 2021
EVM User's guide LM74810 Evaluation Module: LM74810EVM (Rev. A) PDF | HTML 09 Dec 2020
Analog Design Journal Automotive EMC-compliant reverse-battery protection with ideal-diode controllers 22 Sep 2020
Application note Ideal Diode Controllers for Active Rectification of AC Voltage Ripple 30 Jun 2020
Functional safety information Streamlining Functional Safety Certification in Automotive and Industrial 09 Jun 2020
White paper 簡化汽車及工業領域的功 能安全認證 09 Jun 2020
White paper 자동차 및 산업 분야의 기능적 안전성 인증 간소화 09 Jun 2020
Application note Six System Architectures With Robust Reverse Battery Protection 30 Apr 2020

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

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 (...)
User guide: PDF | HTML
Not available on TI.com
Simulation model

LM74810-Q1 PSPICE Transient Model

SNOM681.ZIP (145 KB) - PSpice Model
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
High-side switch controllers
TPS4800-Q1 Automotive 100-V low IQ high side driver with protection and diagnostics TPS4810-Q1 Automotive, 100V low IQ dual high-side driver with short circuit protection and diagnostics TPS4811-Q1 Automotive 3.5V to 100V high-side driver with protection and diagnostics TPS1200-Q1 Automotive 45-V low IQ high side driver with protection and diagnostics TPS1210-Q1 Automotive 45-V low IQ dual high-side driver with short circuit protection and diagnostics TPS1211-Q1 Automotive 3.5V to 45V high-side driver with protection and diagnostics TPS1213-Q1 Automotive 45V low IQ high-side driver with low power mode and adjustable short circuit protection
Design tool

TIDA-020033-TD-DESIGN TIDA-020033 test documentation

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
LM5123-Q1 2.2MHz wide VIN low IQ synchronous boost controller LM51231-Q1 2.2-MHz wide-VIN, synchronous boost controller with output voltage tracking
Analog current-sense amplifiers
INA302-Q1 AEC-Q100, 36V, bi-directional, 550kHz, 4V/µs, high-precision current sense amp w/ dual comparators
Speaker amps
TAS6584-Q1 Automotive 45-V, 10-A digital input, four-channel Class-D audio amplifier with current sense
Ideal diode/ORing controllers
LM7481-Q1 Automotive ideal diode controller with active rectification driving B2B NFETs
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
Reference designs

TIDA-020033 — Automotive Class-H audio and tracking power supply reference design

This reference design demonstrates a Class-H audio and tracking power supply audio subsystem. The TAS6584-Q1 audio amplifier tracks the envelope of the digital audio input and adjusts the LM5123-Q1 boost output voltage to meet the power efficiency requirements without the need for an external (...)
Design guide: PDF
Reference designs

TIDA-020040 — Automotive transient and overcurrent protection filter reference design

This reference design showcases a protection system for voltage and current transient events typically found in automotive systems. This reference design optimizes functionality, size and protection capabilities while not sacrificing power delivery for premium audio amplifiers.
Design guide: PDF
Schematic: PDF
Package Pins CAD symbols, footprints & 3D models
WSON (DRR) 12 Ultra Librarian

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Information included:
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