Overview
The LM74700QDBVRQ1 is an automotive AEC Q100 qualified ideal diode controller designed by Texas Instruments. This device operates in conjunction with an external N-channel MOSFET to provide low loss reverse polarity protection with a 20-mV forward voltage drop. It is particularly suited for automotive applications, including ADAS systems, infotainment systems, and industrial factory automation. The controller supports a wide supply input range of 3.2 V to 65 V, making it compatible with various DC bus voltages such as 12-V, 24-V, and 48-V automotive battery systems. It is also capable of withstanding and protecting loads from negative supply voltages as low as –65 V, making it ideal for harsh cold crank conditions in automobiles.
Key Specifications
| Parameter | Min | Nom | Max |
|---|---|---|---|
| Input Voltage Range | 3.2 V | - | 65 V |
| Forward Voltage Drop (ANODE to CATHODE) | - | - | 20 mV |
| Reverse Voltage Rating | -65 V | - | - |
| Operating Junction Temperature Range | -40°C | - | 125°C |
| Shutdown Current (EN=Low) | - | - | 1 µA |
| Operating Quiescent Current (EN=High) | - | - | 80 µA |
| Peak Gate Turnoff Current | - | - | 2.3 A |
| Response Time to Reverse Current Blocking | - | - | < 0.75 µs |
| Package Type | - | - | SOT-23 (6-pin and 8-pin) |
| Package Size | - | - | 2.90 mm × 1.60 mm |
Key Features
- AEC-Q100 qualified with an ambient operating temperature range of –40°C to +125°C and ESD classification levels of HBM ESD level 2 and CDM ESD level C4B.
- Functional Safety-Capable with documentation available to aid in functional safety system design.
- Wide input voltage range of 3.2 V to 65 V, suitable for various automotive battery systems.
- Charge pump for external N-channel MOSFET, enabling low loss reverse polarity protection.
- Enable pin feature with a shutdown current of approximately 1 µA when EN is low.
- Fast response to reverse current blocking, meeting automotive ISO7637 transient requirements with a suitable TVS diode.
- Available in 6-pin and 8-pin SOT-23 packages.
Applications
- Automotive ADAS (Advanced Driver Assistance Systems) - camera systems.
- Automotive infotainment systems - digital cluster, head unit.
- Industrial factory automation - PLC (Programmable Logic Controllers).
- Enterprise power supplies.
- Active ORing for redundant power systems.
Q & A
- What is the primary function of the LM74700QDBVRQ1?
The LM74700QDBVRQ1 functions as an ideal diode controller in conjunction with an external N-channel MOSFET to provide low loss reverse polarity protection.
- What is the input voltage range of the LM74700QDBVRQ1?
The input voltage range is from 3.2 V to 65 V.
- What is the forward voltage drop of the LM74700QDBVRQ1?
The forward voltage drop is regulated at 20 mV.
- What is the reverse voltage rating of the LM74700QDBVRQ1?
The device can withstand negative supply voltages as low as –65 V.
- What is the operating junction temperature range of the LM74700QDBVRQ1?
The operating junction temperature range is from –40°C to +125°C.
- What is the shutdown current when the enable pin (EN) is low?
The shutdown current is approximately 1 µA when EN is low.
- What is the operating quiescent current when the enable pin (EN) is high?
The operating quiescent current is 80 µA when EN is high.
- How fast does the LM74700QDBVRQ1 respond to reverse current blocking?
The response time to reverse current blocking is less than 0.75 µs.
- In what package types is the LM74700QDBVRQ1 available?
The device is available in 6-pin and 8-pin SOT-23 packages.
- What are some common applications of the LM74700QDBVRQ1?
Common applications include automotive ADAS systems, infotainment systems, industrial factory automation, enterprise power supplies, and active ORing for redundant power systems).
