Calculation tool
LM74912-CALC — Design calculator for LM74912-Q1 ideal diode controller
The design calculator allows user to size the external peripheral components while designing with LM74912-Q1 ideal diode controller
LM74912-Q1
Automotive ideal diode with integrated over-voltage and short circuit protection w/ fault output
Data sheet
LM74912-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 response (0.5 µs)
- 20-mA peak gate (DGATE) turn-on current
- 2.6-A peak DGATE turn-off current
- Adjustable overvoltage and undervoltage protection
- Output short circuit protection with MOSFET latched off state
- Ultra low power mode with 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 transient voltage suppressor (TVS) diode
- Available in 4 mm × 4 mm 24-pin VQFN package
The LM74912-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 overvoltage, undervoltage and output short circuit 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 external MOSFET VDS sense based short circuit protection with an adjustable current limit. When short circuit condition is detected on the output then device latches off the load disconnect MOSFET. 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 LM74912-Q1 has a maximum voltage rating of 65 V.
Technical documentation
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View all 3 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM74912-Q1 Automotive Ideal Diode Controller With Fault Output and Overvoltage, Undervoltage, and Short Circuit Protection datasheet (Rev. A) | PDF | HTML | 20 Sep 2023 |
| Application brief | Enabling Ultra Low Quiescent Current Through LM74912- Q1 Sleep Mode While Powering Always On Loads | PDF | HTML | 11 Dec 2023 | |
| Certificate | LM74912Q1EVM EU Declaration of Conformity (DoC) | 26 Jun 2023 |
Design & development
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Evaluation board
LM74912Q1EVM — LM74912-Q1 evaluation module for ideal diode controller
The LM74912-Q1 evaluation module evaluates the operation and performance of the LM74912-Q1 ideal diode controller in reverse battery protection applications. This evaluation module demonstrates how LM74912-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 (...)
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Test report: PDF
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RGE) | 24 | Ultra Librarian |
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