Overview
The LM74502DDFR, produced by Texas Instruments, is a highly versatile and robust industrial Reverse Polarity Protection (RPP) controller. This device is designed to operate in conjunction with external back-to-back connected N-channel MOSFETs to provide a low-loss reverse polarity protection and load disconnect solution. It also supports configuration as a high-side switch with overvoltage protection. The LM74502DDFR features a wide input voltage range of 3.2 V to 65 V, making it suitable for various DC bus voltages such as 12 V, 24 V, and 48 V systems. It can withstand negative supply voltages down to –65 V, ensuring robust protection against reverse polarity and overvoltage conditions.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Voltage Range | 3.2 V to 65 V | V |
| Input Reverse Voltage Rating | –65 V | V |
| Start-Up Voltage | 3.9 V | V |
| Peak Gate Drive Source Current (LM74502) | 60 µA | A |
| Peak Gate Drive Source Current (LM74502H) | 11 mA | A |
| Peak Gate Sink Current | 2.3 A | A |
| Operating Quiescent Current (EN/UVLO = High) | 45 µA | A |
| Shutdown Current (EN/UVLO = Low) | 1 µA | A |
| Ambient Operating Temperature Range | –40°C to +125°C | °C |
| Package Type | 8-pin SOT-23 | - |
| Package Dimensions | 2.90 mm × 1.60 mm | mm |
Key Features
- Integrated charge pump to drive external back-to-back N-channel MOSFETs and high-side switch MOSFETs.
- Adjustable overvoltage and undervoltage protection to cut off the load from the input source during fault events.
- Enable pin feature allowing the device to enter low IQ shutdown mode when the pin is pulled low.
- Low system current in sleep mode, drawing approximately 1 µA.
- Programmable overvoltage protection using the OV pin.
- Inrush current control capability through an external circuit on the GATE pin.
Applications
- Factory automation and control, particularly in PLC digital output modules.
- Industrial motor drives.
- Industrial transport systems.
- Power supply reverse polarity protection.
Q & A
- What is the input voltage range of the LM74502DDFR?
The input voltage range is from 3.2 V to 65 V, with a start-up voltage of 3.9 V.
- What is the reverse voltage rating of the LM74502DDFR?
The device can withstand negative supply voltages down to –65 V.
- What are the peak gate drive source currents for LM74502 and LM74502H?
The LM74502 has a peak gate drive source current of 60 µA, while the LM74502H has a peak gate drive source current of 11 mA.
- What is the operating quiescent current of the LM74502DDFR when enabled?
The typical operating quiescent current is 45 µA when the EN/UVLO pin is high.
- How does the enable pin function affect the device's power consumption?
Pulling the enable pin low puts the device into a low IQ shutdown mode, drawing approximately 1 µA of current.
- What type of protection does the LM74502DDFR offer?
The device offers adjustable overvoltage and undervoltage protection, as well as reverse polarity protection.
- What is the ambient operating temperature range of the LM74502DDFR?
The device operates over a temperature range of –40°C to +125°C.
- In what package is the LM74502DDFR available?
The device is available in an 8-pin SOT-23 package, measuring 2.90 mm × 1.60 mm.
- Can the LM74502DDFR be used for inrush current control?
- What are some common applications of the LM74502DDFR?
