The LM74700-Q1 is an automotive AEC Q100 qualified ideal diode controller which operates in conjunction with an external N-channel MOSFET as an ideal diode rectifier for low loss reverse polarity protection with a 20-mV forward voltage drop. 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 device controls the GATE of the MOSFET to regulate the forward voltage drop at 20 mV. The regulation scheme enables graceful turn off of the MOSFET during a reverse current event and ensures zero DC reverse current flow. Fast response (< 0.75 µs) to Reverse Current Blocking makes the device suitable for systems with output voltage holdup requirements during ISO7637 pulse testing as well as power fail and input micro-short conditions.
The LM74700-Q1 controller provides a charge pump gate drive for an external N-channel MOSFET. The high voltage rating of LM74700-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.
| Type | Title | Date | |
|---|---|---|---|
| * | Data sheet | LM74700-Q1 Low IQ Reverse Battery Protection Ideal Diode Controller datasheet (Rev. G) | 21 Dec 2020 |
| Application note | Basics of Ideal Diodes (Rev. B) | 05 Oct 2021 | |
| Certificate | Automotive PPAP Documentation | 18 Jun 2021 | |
| Analog design journal | Multibattery management in medical ultrasound systems (Rev. A) | 21 Jan 2021 | |
| User guide | LM74700DDFEVM: Evaluation Module for LM74700-Q1 | 10 Dec 2020 | |
| Technical article | Meet airline restrictions with power-path control for dual batteries | 21 Jul 2020 | |
| White paper | 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 | |
| Functional safety information | LM74700-Q1 Functional Safety FIT Rate and Failure Mode Distribution | 16 Dec 2019 | |
| E-book | 11 Ways to Protect Your Power Path white paper | 03 Jul 2019 | |
| Application note | Basics of Power Switches (Rev. A) | 26 Apr 2019 | |
| User guide | LM74700 Evaluation Module (Rev. A) | 11 Feb 2019 |
For additional terms or required resources, click any title below to view the detail page where available.
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 (...)
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| Package | Pins | Download |
|---|---|---|
| SOT-23 (DBV) | 6 | View options |
| SOT-23-THIN (DDF) | 8 | View options |
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