Overview
The Texas Instruments LM74502QDDFRQ1 is an automotive-grade, AEC-Q100 qualified controller designed for reverse polarity protection and load disconnect applications. This device operates in conjunction with external back-to-back connected N-channel MOSFETs to provide a low-loss solution for protecting loads from negative supply voltages and other fault conditions. The LM74502QDDFRQ1 supports a wide input supply range of 3.2 V to 65 V, making it suitable for various DC bus voltages in automotive systems, including 12-V, 24-V, and 48-V battery systems.
Key Specifications
| Product Attribute | Attribute Value |
|---|---|
| Package / Case | SOT-23-8 |
| Mounting Type | Surface Mount |
| Input / Supply Voltage - Min | 3.2 V |
| Input / Supply Voltage - Max | 65 V |
| Operating Temperature | -40°C to +125°C (TJ) |
| Number of Channels | 1 Channel |
| Current - Output (Max) | 2 A |
| Operating Supply Current | 45 µA |
| FET Type | N-Channel |
| Delay Time - OFF | 2 µs |
| Delay Time - ON | 75 µs |
| Gate Drive Strength | 60 µA (typical) |
| Shutdown Current (EN/UVLO = Low) | 1 µA |
| Moisture Sensitive | Yes |
| RoHS Compliant | Yes |
Key Features
- AEC-Q100 qualified with an operating temperature range of -40°C to +125°C.
- Integrated charge pump to drive external back-to-back connected N-channel MOSFETs for reverse polarity protection and load disconnect functions.
- Wide input supply range of 3.2 V to 65 V, supporting various automotive DC bus voltages.
- Programmable overvoltage and undervoltage protection using a resistor divider.
- Low shutdown current of approximately 1 µA when the enable pin is low.
- Gate drive variants: LM74502-Q1 with 60 µA peak gate drive strength and LM74502H-Q1 with 11 mA peak gate drive strength.
- Meets automotive ISO7637 pulse 1 transient requirements with additional TVS diode.
Applications
- Automotive systems: particularly suitable for protecting loads in 12-V, 24-V, and 48-V battery systems.
- Reverse polarity protection: protects loads from negative supply voltages down to -65 V.
- Load disconnect applications: used in conjunction with external MOSFETs to disconnect loads in case of overvoltage or undervoltage events.
- Automotive body control modules and other automotive electronic control units (ECUs).
Q & A
- What is the operating temperature range of the LM74502QDDFRQ1?
The operating temperature range is -40°C to +125°C (TJ).
- What is the input supply voltage range of the LM74502QDDFRQ1?
The input supply voltage range is 3.2 V to 65 V.
- What type of MOSFETs does the LM74502QDDFRQ1 drive?
The LM74502QDDFRQ1 drives external back-to-back connected N-channel MOSFETs.
- Does the LM74502QDDFRQ1 have programmable overvoltage and undervoltage protection?
Yes, it does. The protection thresholds can be programmed using a resistor divider.
- What is the typical operating quiescent current of the LM74502QDDFRQ1?
The typical operating quiescent current is 45 µA when the enable pin is high.
- What is the shutdown current of the LM74502QDDFRQ1 when the enable pin is low?
The shutdown current is approximately 1 µA when the enable pin is low.
- Is the LM74502QDDFRQ1 RoHS compliant?
Yes, it is RoHS compliant.
- What are the gate drive variants available for the LM74502-Q1?
The LM74502-Q1 has a gate drive strength of 60 µA, and the LM74502H-Q1 has a gate drive strength of 11 mA.
- Does the LM74502QDDFRQ1 meet automotive ISO7637 pulse 1 transient requirements?
Yes, it meets automotive ISO7637 pulse 1 transient requirements with additional TVS diode.
- What is the package type of the LM74502QDDFRQ1?
The package type is SOT-23-8.
