The LM74500-Q1 is an automotive AEC Q100 qualified controller which operates in conjunction with an external N-channel MOSFET as a low loss reverse polarity protection solution. The wide supply input range of 3.2 V to 65 V allows control of many popular DC bus voltages such as 12-V, 24-V and 48-V automotive battery systems. The 3.2-V input voltage support is particularly well suited for severe cold crank requirements in automotive systems. The device can withstand and protect the loads from negative supply voltages down to –65 V. The LM74500-Q1 does not have reverse current blocking and is suitable for input reverse poalrity protection of loads that can potentially deliver energy back to the input supply such as automotive body control module motor loads.
The LM74500-Q1 controller provides a charge pump gate drive for an external N-channel MOSFET. The high voltage rating of LM74500-Q1 helps to simplify the system designs for automotive ISO7637 protection. With the enable pin low, the controller is off and draws approximately 1 µA of current thus offering low system current when put into sleep mode.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM74500-Q1 Reverse Polarity Protection Controller datasheet | PDF | HTML | 23 Dec 2020 |
| Functional safety information | LM74500-Q1 Functional Safety, FIT Rate, Failure Mode Distribution and Pin FMA | PDF | HTML | 18 Jan 2024 | |
| Application note | Basics of Ideal Diodes (Rev. B) | PDF | HTML | 05 Oct 2021 | |
| User guide | LM74500-Q1 Evaluation Module | PDF | HTML | 10 Dec 2020 | |
| Certificate | LM74500Q1EVM EU RoHS Declaration of Conformity (DoC) | 03 Dec 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 | ||
| E-book | 11 Ways to Protect Your Power Path | 03 Jul 2019 | ||
| Application note | Basics of Power Switches (Rev. A) | PDF | HTML | 26 Apr 2019 |
For additional terms or required resources, click any title below to view the detail page where available.
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 (...)
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 (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| SOT-23-THN (DDF) | 8 | Ultra Librarian |
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