Overview
The LM74700-Q1 is an automotive AEC Q100 qualified ideal diode controller produced by Texas Instruments. This device operates in conjunction with an external N-channel MOSFET to function as an ideal diode rectifier, providing low loss reverse polarity protection with a 20-mV forward voltage drop. It is designed to control various DC bus voltages, such as 12-V, 24-V, and 48-V automotive battery systems, and is particularly suited for severe cold crank requirements. The LM74700-Q1 can withstand and protect loads from negative supply voltages down to –65 V and ensures fast response to reverse current blocking, making it suitable for systems with output voltage holdup requirements during ISO7637 pulse testing and other transient conditions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Temperature Range | –40 to 125 | °C |
| Input Voltage Range | 3.2 to 65 | V |
| Reverse Voltage Rating | –65 | V |
| Forward Voltage Drop Regulation | 20 mV | mV |
| Shutdown Current (EN=Low) | 1 µA | µA |
| Operating Quiescent Current (EN=High) | 80 µA | µA |
| Peak Gate Turnoff Current | 2.3 A | A |
| Response Time to Reverse Current Blocking | < 0.75 µs | µs |
| Package Type | 6-pin and 8-pin SOT-23 | |
| Package Size | 2.90 mm × 1.60 mm | mm |
Key Features
- AEC-Q100 qualified with device temperature grade 1: –40°C to +125°C ambient operating temperature range.
- Device HBM ESD classification level 2 and CDM ESD classification level C4B.
- Functional Safety-Capable with documentation available to aid functional safety system design.
- Charge pump for external N-channel MOSFET.
- Enable pin feature with low shutdown current (1 µA) and operating quiescent current (80 µA).
- Fast response to reverse current blocking: < 0.75 µs.
- Meets automotive ISO7637 transient requirements with a suitable TVS Diode.
Applications
- Automotive ADAS systems - camera.
- Automotive infotainment systems - digital cluster, head unit.
- Industrial factory automation - PLC.
- Enterprise power supplies.
- Active ORing for redundant power.
Q & A
- What is the operating temperature range of the LM74700-Q1?
The operating temperature range is –40°C to +125°C. - What is the input voltage range of the LM74700-Q1?
The input voltage range is 3.2 V to 65 V. - What is the reverse voltage rating of the LM74700-Q1?
The reverse voltage rating is –65 V. - What is the forward voltage drop regulation of the LM74700-Q1?
The forward voltage drop regulation is 20 mV. - What is the shutdown current when the enable pin is low?
The shutdown current is approximately 1 µA. - What is the operating quiescent current when the enable pin is high?
The operating quiescent current is 80 µA. - What is the peak gate turnoff current of the LM74700-Q1?
The peak gate turnoff current is 2.3 A. - How fast does the LM74700-Q1 respond to reverse current blocking?
The response time to reverse current blocking is less than 0.75 µs. - What package types are available for the LM74700-Q1?
The LM74700-Q1 is available in 6-pin and 8-pin SOT-23 packages. - What are some common applications of the LM74700-Q1?
Common applications include automotive ADAS systems, infotainment systems, industrial factory automation, enterprise power supplies, and active ORing for redundant power.
