Calculation tool
LM749X0-CALC — Design calculator for LM74900-Q1 and LM74910-Q1 devices
The design calculator allows user to size the external peripheral components while designing with LM74900-Q1 and LM74910-Q1 Devices
LM74900-Q1
Automotive ideal diode with circuit breaker, under- and overvoltage protection with fault output
Data sheet
LM74900-Q1
- AEC-Q100 qualified for automotive applications
- Device temperature grade 1: –40°C to +125°C ambient operating temperature range
- Functional Safety-Capable
- 3-V to 65-V input range
- Reverse input protection down to –65 V
- Drives external back-to-back N-Channel MOSFETs in common drain configuration
- Ideal diode operation with 10.5-mV A to C forward voltage drop regulation
- Low reverse detection threshold (–10.5 mV) with fast turn off response (0.5 µs)
- 20-mA peak gate (DGATE) turn on current
- 2.6-A peak DGATE turnoff current
- Adjustable overcurrent and short circuit protection
- Analog current monitor output with 10% accuracy (IMON)
- Adjustable overvoltage and undervoltage protection
- Low 2.5-µA shutdown current (EN=Low)
- SLEEP mode with 6-µA current (EN=High, SLEEP=Low)
- Meets automotive ISO7637 transient requirements with a suitable TVS diode
- Available in space saving 24-Pin VQFN package
The LM749x0-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 with overcurrent and overvoltage 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. With a second MOSFET in the power path the device allows load disconnect (ON/OFF control) in case of overcurrent and overvoltage events using HGATE control. The device has integrated current sense amplifier which provides accurate current monitoring with adjustable overcurrent and short circuit thresholds. The device features an adjustable overvoltage cut-off protection feature. The device features a SLEEP mode which enables ultra-low quiescent current consumption (6 µA) and at the same time providing refresh current to the always ON loads when vehicle is in the parking state. The LM749x0-Q1 has a maximum voltage rating of 65 V.
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Technical documentation
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View all 9 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM749x0-Q1 Automotive Ideal Diode With Circuit Breaker, Undervoltage, and Overvoltage Protection With Fault Output datasheet (Rev. B) | PDF | HTML | 18 Jul 2023 |
| Functional safety information | LM749x0-Q1 Functional Safety FIT Rate, FMD and Pin FMA | PDF | HTML | 29 Feb 2024 | |
| Analog Design Journal | 適合使用理想二極體控制器的汽車應用備援電源拓撲 | PDF | HTML | 15 Feb 2024 | |
| Analog Design Journal | 이상적인 다이오드 컨트롤러를 사용하는 차량용 이중 공급 토폴로지 | PDF | HTML | 15 Feb 2024 | |
| Analog Design Journal | Redundant supply topologies for automotive applications using ideal diode controllers | PDF | HTML | 14 Feb 2024 | |
| EVM User's guide | LM74900Q1EVM Evaluation Module for LM749x0-Q1 Ideal Diode Controller (Rev. A) | PDF | HTML | 03 Jul 2023 | |
| Application note | Addressing Automotive Reverse Battery Protection Topologies with LM749x0-Q1 | PDF | HTML | 13 Jun 2023 | |
| Application brief | Priority Power MUX using Ideal Diodes in Automotive Zonal Modules | PDF | HTML | 23 May 2023 | |
| Certificate | LM74900Q1EVM EU RoHS Declaration of Conformity (DoC) | 01 Nov 2022 |
Design & development
For additional terms or required resources, click any title below to view the detail page where available.
Evaluation board
LM74900Q1EVM — LM74900-Q1 evaluation module for ideal diode controller
The LM74900-Q1 evaluation module evaluates the operation and performance of the LM74900-Q1 ideal diode controller in reverse battery protection applications. This evaluation module demonstrates how LM74900-Q1 controls two back-back N-channel power MOSFETs to emulate an ideal diode rectifier with (...)
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
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This reference design showcases the 100W automotive infotainment display module power reference design with cold crank, load dump and FuSa Capabilities.
The LM74900-Q1 is the first stage of the design playing a role of protection for negative input voltage, undervoltage, locked output, and (...)
Test report: PDF
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RGE) | 24 | Ultra Librarian |
Ordering & quality
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