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LM74930-CALC — Design calculator for LM74930-Q1 ideal diode controller
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LM74930-Q1
Automotive 3-V to 65-V surge stopper with circuit breaker and overvoltage protection
Data sheet
LM74930-Q1
- AEC-Q100 qualified for automotive applications
- Device temperature grade 1: –40°C to +125°C ambient operating temperature range
- 4-V to 65-V input range
- Reverse input protection down to –65 V
- Drives external back-to-back N-Channel MOSFETs in common source configuration
- Ideal diode operation with 10.5-mV A to C forward voltage drop regulation
- Low reverse detection threshold (–10.5 mV) with fast DGATE turn-off response (0.5 µs)
- 18-mA peak gate (DGATE) turn on current
- 2.6-A peak DGATE turn-off 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)
- MODE pin to allow bi-directional current flow (MODE=Low)
- Meets automotive ISO7637 transient requirements with a suitable TVS diode
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Available in space saving 24-pin VQFN package
The LM74930-Q1 ideal diode controller drives and controls external back to back N-Channel MOSFETs to emulate an ideal diode rectifier and power path ON and OFF control with over current and overvoltage protection. The wide input supply of 4 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 high side gate control (HGATE) drives the first MOSFET in the power path. The device allows load disconnect (ON and OFF control) in case of overcurrent, overvoltage and undervoltage event using HGATE control while ideal diode controller (DGATE) drives a second MOSFET to replace a Schottky diode for input reverse polarity protection and output voltage holdup by blocking the reverse current from output to input. The device has integrated current sense amplifier which provides with an adjustable overcurrent and short circuit protection with circuit breaker functionality. The device features an adjustable overvoltage and undervoltage protection feature to protect against supply transients. LM74930-Q1 features MODE pin which can be used to selectively enable or disable reverse current blocking functionality.
Technical documentation
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View all 5 | Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM74930-Q1 Automotive Ideal Diode Surge Stopper With Circuit Breaker, Overvoltage Protection, and Fault Output datasheet | PDF | HTML | 31 Oct 2023 |
| Functional safety information | LM74930-Q1 Functional Safety FIT Rate, FMD and Pin FMA | PDF | HTML | 16 Oct 2024 | |
| Application brief | Protection against Unsuppressed Load Dump in Automotive Systems using LM74930-Q1 | PDF | HTML | 14 Nov 2023 | |
| EVM User's guide | LM74930-Q1 Evaluation Module for Ideal Diode Controller User's Guide | PDF | HTML | 01 Nov 2023 | |
| Certificate | LM74930Q1EVM EU Declaration of Conformity (DoC) | 05 Oct 2023 |
Design & development
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Evaluation board
LM74930Q1EVM — LM74930-Q1 evaluation module for 3-V to 65-V surge stopper with circuit breaker
The LM74930-Q1 evaluation module (EVM) is a platform for evaluating the operation and performance of the LM74930-Q1 ideal diode controller in reverse battery-protection applications. LM74930Q1EVM demonstrates how LM74930-Q1 controls two back-to-back N-channel power MOSFETs to emulate an ideal diode (...)
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
PMP23468 — 48V input, 875W peak power, multiphase buck converter reference design for audio systems
This reference design provides protection and power for automotive audio systems. Operation with a 48VDC input was tested across the full output voltage range: 6VDC to 35VDC. The design exhibits a peak efficiency of 97% at nominal load, and no significant output voltage undershoot and overshoot for (...)
Test report: PDF
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| VQFN (RGE) | 24 | Ultra Librarian |
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