Ideal diode/ORing controllers

Improve efficiency and performance in automotive battery input protection and power supply ORing applications

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Our ideal diode and ORing controllers offer space-saving and scalable solutions to protect your system against reverse voltage or reverse current. These devices significantly reduce the energy typically lost across the forward voltage drop of traditional discrete silicon or Schottky diodes.

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Reverse polarity protectors

Ideal for P-FET replacement applications that need reverse polarity protection without reverse current blocking

Ideal diode controller

Ideal for discrete diode replacement for applications that need reverse polarity protection and reverse current blocking

Featured ideal diodes and ORing controllers

LM74703-Q1
Ideal diode/ORing controllers

Automotive ideal diode controller with FET good output

Approx. price (USD) 1ku | 0.599

LM74704-Q1
Ideal diode/ORing controllers

Automotive ideal diode controller with FET good open-drain output

Approx. price (USD) 1ku | 0.599

LM74930-Q1
Ideal diode/ORing controllers

Automotive 3-V to 65-V surge stopper with circuit breaker and overvoltage protection

Approx. price (USD) 1ku | 1.8

LM74700D-Q1
Ideal diode/ORing controllers

Automotive, 3.2-V to 70-V, 80-µA reverse battery protection ideal diode controller

Approx. price (USD) 1ku | 0.791

LM74912-Q1
Ideal diode/ORing controllers

Automotive ideal diode with integrated over-voltage and short circuit protection w/ fault output

Approx. price (USD) 1ku | 1.2

LM74900-Q1
Ideal diode/ORing controllers

Automotive ideal diode with circuit breaker, under- and overvoltage protection with fault output

Approx. price (USD) 1ku | 1.302

Benefits of ideal diode & ORing controllers

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Power efficiency    

Reduce the energy loss from traditional discrete or Schottky diodes with low voltage drop, low IQ and thermal optimization.

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Protection

Improve system reliability with comprehensive power path and redundant power supply protection such as reverse polarity protection, reverse current blocking and load dump and surge protection.

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Space saving

Optimize your system with scalable controllers or fully integrated ideal diodes featuring an N-FET controller, integrated charge pump or integrated FET.

Technical resources

Application note
Application note
Basics of Ideal Diodes (Rev. B)
Read how our ideal diode controllers overcome the common limitations of Schottky diodes or P-channel MOSFETs used for traditional input protection or ORing applications.
document-pdfAcrobat PDF
Application note
Application note
Six System Architectures With Robust Reverse Battery Protection
New automotive trends are demanding higher efficiency and power density in front-end power systems. Explore how the new LM74800-Q1 B2B FET ideal diode controller simplifies common design architectures.
document-pdfAcrobat PDF
Application brief
Application brief
Eliminate the Voltage Drop and Save Power: An Ideal Diode (Rev. A)
In applications like smart eMeters or thermostats, backup batteries or redundant power supplies may be leveraged to reduce system downtime. See how the LM66100 can be used to block reverse current with a low-forward voltage drop.
document-pdfAcrobat PDF

Discover featured applications

Advanced driver assistance systems (ADAS)
Design power-dense, full-featured battery input protection for your ADAS
Zonal & body domain controllers
Tackle increasing automotive electrical demands with reliable, full-featured zonal modules and power distribution systems
Hybrid, electric & powertrain systems
Reliably protect battery components and subsystems with highly integrated, power-dense protection ICs
Premium audio
Create an immersive in-vehicle experience through high-quality audio systems

Design power-dense, full-featured battery input protection for your ADAS

Now that electronic control units have more processing power, traditional protection solutions such as Schottky diodes and P-channel field-effect transistors (FETs) are not viable options. Our ideal diodes protect downstream devices and systems with high system efficiency, improved thermal management and a very small size.

Benefits:

  • Adjustable current limits, reverse polarity and current protection, inrush current control, and overcurrent and short-circuit protection.
  • Small, power-dense packaging.
  • Internal or external FET options.

Featured resources

REFERENCE DESIGNS
  • TIDA-01323 – ADAS multi-sensor hub reference design with quad 4-Gbps FPD-Link III, dual CSI-2 output, and PoC
  • TIDA-01005 – Automotive ADAS Reference Design for Four Camera Hub with MIPI CSI-2 Output
  • PMP10750 – System Level Power Reference Design for 20-W ADAS system with Automotive Protections
PRODUCTS
  • LM74910-Q1 – Automotive ideal diode with circuit breaker, 200-kHz ACS and under- and overvoltage protection
  • LM74700-Q1 – 3.2-V to 65-V, 80-uA IQ automotive ideal diode controller
  • LM74202-Q1 – 4.2-V to 40-V, 2.2A 300uA IQ automotive ideal diode with Integrated FET
TECHNICAL RESOURCES

Tackle increasing automotive electrical demands with reliable, full-featured zonal modules and power distribution systems

As vehicles incorporate more electronics and features, efficiency in weight, space and power become increasingly important. Our ideal diodes help you design highly scalable and efficient solutions with complete input power-path protection.

Benefits: 

  • Protection against transient events such as reverse current and polarity, inrush current, undervoltage and overvoltage, and overcurrent/short circuits.
  • Replacing discrete diodes and field-effect transistors (FET) increases system efficiency, reduces thermal losses, and saves printed circuit board space.

Featured resources

REFERENCE DESIGNS
  • TIDA-020015 – 4.5-V to 65-V input, compact bias supply with power stage reference design for IGBT/SiC gate drivers
  • TIDA-00745 – 15-W System-Level Power Reference Design for Automotive Body Control Module
PRODUCTS
  • LM74900-Q1 – Automotive ideal diode with circuit breaker, under- and overvoltage protection with fault output
  • LM74700-Q1 – 3.2-V to 65-V, 80-uA IQ automotive ideal diode controller

Reliably protect battery components and subsystems with highly integrated, power-dense protection ICs

Our ideal diodes make power system design easier by bringing necessary protection features together into a single, highly-integrated IC. This enables electric vehicle makers to meet critical safety requirements and customer demand in parallel.

Benefits:

  • Undervoltage/overvoltage, inrush current, reverse current and polarity, and overcurrent and short-circuit protection.
  • Small, power-dense packaging.
  • Internal or external field-effect transistor (FET) options.

Featured resources

REFERENCE DESIGNS
  • TIDA-020014 – HEV/EV traction inverter power stage with 3 types of IGBT/SiC bias-supply solutions reference design
  • TIDA-020015 – 4.5-V to 65-V input, compact bias supply with power stage reference design for IGBT/SiC gate drivers
PRODUCTS
  • LM74900-Q1 – Automotive ideal diode with circuit breaker, under- and overvoltage protection with fault output
  • LM74700-Q1 – 3.2-V to 65-V, 80-uA IQ automotive ideal diode controller

Create an immersive in-vehicle experience through high-quality audio systems

A stable and reliable power supply has enabled vehicles to offer more features that enhance the driving experience, including entertainment provided by audio systems. Our ideal diodes deliver what's important to audio system designs: reliable protection and power density.

Benefits:

  • Reverse current and polarity protection, inrush and linear current control, and overvoltage protection.
  • Small packaging helps audio systems achieve high power and performance in small spaces.

Featured resources

REFERENCE DESIGNS
  • TIDA-020033 – Automotive Class-H audio and tracking power supply reference design
  • TIDA-020040 – Automotive transient and overcurrent protection filter reference design
PRODUCTS
  • LM74910-Q1 – Automotive ideal diode with circuit breaker, 200-kHz ACS and under- and overvoltage protection
  • LM74900-Q1 – Automotive ideal diode with circuit breaker, under- and overvoltage protection with fault output
  • LM7481-Q1 – Automotive ideal diode controller with active rectification driving B2B NFETs

Design & development resources

Evaluation board
LM74700-Q1 3.2-V to 65-V, 80-μA IQ automotive ideal diode controller (DDF package) evaluation module

The LM74700DDFEVM helps designers evaluate the operation and performance of the LM74700-Q1 3.2-V to 65-V, 80-μA IQ automotive ideal diode controller (DDF package). This evaluation module demonstrates how an N-channel power MOSFET can emulate a very-low forward voltage diode with low IQ and (...)

Evaluation board
LM74500-Q1 3.2-V to 65-V, 80-μA IQ reverse polarity protection controller evaluation module

The LM74500-Q1 evaluation module (LM74500Q1EVM) helps designers evaluate the operation and performance of the LM74500-Q1 reverse polarity protection controller. This evaluation module demonstrates how an N-channel power MOSFET can be used to realize input reverse voltage protection with low IQ (...)

Reference design
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.

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