Overview
The LM74700-Q1, produced by Texas Instruments, is an automotive AEC-Q100 qualified ideal diode controller designed to operate in conjunction with an external N-channel MOSFET. This controller serves as an ideal diode rectifier, providing low-loss reverse polarity protection with a minimal forward voltage drop of 20 mV. It is particularly suited for automotive battery systems, including 12V, 24V, and 48V setups, and is also applicable in various industrial and enterprise power supply systems. The device features a wide input voltage range of 3.2 V to 65 V, making it versatile for different DC bus voltages. It also includes an enable pin for control, a charge pump for the MOSFET gate drive, and fast response times to reverse current blocking, ensuring robust protection against transient events.
Key Specifications
| Parameter | Value | Parameter | Value |
|---|---|---|---|
| Vin (min) | 3.2 V | Vin (max) | 65 V |
| Reverse Voltage Rating | –65 V | Forward Voltage Drop | 20 mV |
| Enable Pin Current (Low) | 1 µA | Operating Quiescent Current (High) | 80 µA |
| Peak Gate Turnoff Current | 2.3 A | Reverse Current Blocking Response Time | < 0.75 µs |
| Ambient Operating Temperature Range | –40°C to +125°C | Package Type | 6-pin and 8-pin SOT-23 |
| Package Size | 2.90 mm × 1.60 mm | ESD Classification | HBM Level 2, CDM Level C4B |
Key Features
- AEC-Q100 qualified for automotive applications
- Functional Safety-Capable with supporting documentation
- Wide input voltage range of 3.2 V to 65 V
- Low forward voltage drop of 20 mV
- Charge pump for external N-channel MOSFET gate drive
- Enable pin for control, with low shutdown current of 1 µA
- Fast response to reverse current blocking (< 0.75 µs)
- Meets automotive ISO7637 transient requirements
- Compact packaging in 6-pin and 8-pin SOT-23
- Fault tolerant design and sensitive current limiting
- Maintenance-free operation
Applications
- Automotive ADAS systems - camera and sensor systems
- Automotive infotainment systems - digital cluster, head unit
- Industrial factory automation - PLC and control systems
- Enterprise power supplies and data centers
- Active ORing for redundant power systems
Q & A
- What is the input voltage range of the LM74700-Q1?
The input voltage range is from 3.2 V to 65 V.
- What is the forward voltage drop of the LM74700-Q1?
The forward voltage drop is 20 mV.
- What is the purpose of the enable pin on the LM74700-Q1?
The enable pin allows for control of the device, with a low shutdown current of 1 µA when the pin is low.
- How quickly does the LM74700-Q1 respond to reverse current blocking?
The device responds in less than 0.75 µs.
- What are the package options for the LM74700-Q1?
The device is available in 6-pin and 8-pin SOT-23 packages.
- Is the LM74700-Q1 compliant with automotive standards?
Yes, it is AEC-Q100 qualified and meets automotive ISO7637 transient requirements.
- What is the operating temperature range of the LM74700-Q1?
The ambient operating temperature range is –40°C to +125°C.
- What type of ESD classification does the LM74700-Q1 have?
The device has HBM Level 2 and CDM Level C4B ESD classification.
- What are some typical applications of the LM74700-Q1?
It is used in automotive ADAS, infotainment systems, industrial automation, enterprise power supplies, and active ORing for redundant power systems.
- Does the LM74700-Q1 support functional safety?
Yes, it is Functional Safety-Capable with supporting documentation available.
