LM74502HQDDFRQ1

The LM74502-Q1 and LM74502H-Q1 are controllers compliant with the automotive AEC-Q100 standard. They work in conjunction with externally back-to-back connected N-channel MOSFETs to implement low-loss reverse polarity protection and load disconnect solutions. The wide power supply input range of 3.2V to 65V enables control of many commonly used DC bus voltages (e.g., 12V, 24V, and 48V automotive battery systems). The 3.2V input voltage support meets the stringent cold-start requirements of automotive systems. The device can withstand and protect the load from negative supply voltages as low as –65V. The LM74502-Q1 and LM74502H-Q1 do not have a reverse current blocking function and are suitable for providing input reverse polarity protection to loads that may transfer energy back to the input power supply, such as automotive body control module motor loads. The LM74502-Q1 controller provides a charge pump gate driver for external N-channel MOSFETs. The high voltage rating of the LM74502-Q1 helps simplify the system design to meet the ISO7637 automotive protection test standard. When the enable pin is at a low level, the controller turns off and consumes approximately 1μA of current, thus providing low system current when entering sleep mode. The LM74502-Q1 has programmable overvoltage and undervoltage protection functions, which can disconnect the load from the input source when these faults occur.

Applications

• Body electronics and lighting
• Automotive infotainment systems - digital instrument clusters, audio head units
• Automotive USB hubs

Key features

• AEC-Q100 qualified with the following characteristics:
• Device temperature grade 1: –40°C to +125°C ambient operating temperature range
• Device HBM ESD classification level 2
• Device CDM ESD classification level C4B
• 3.2V to 65V input range (3.9V startup)
• –65V input reverse voltage rating
• Integrated charge pump for driving external back-to-back N-channel MOSFET external high-side switch MOSFET
• External reverse polarity protection MOSFET
• Gate driver variants:
• LM74502-Q1: 60μA peak gate drive source current capability
• LM74502H-Q1: 11mA peak gate drive source current capability
• 2A peak gate sink current capability
• 1μA shutdown current (EN/UVLO = LOW)
• 45μA typical operating quiescent current (EN/UVLO = HIGH)
• Adjustable overvoltage and undervoltage protection
• Meets automotive ISO7637 pulse 1 transient requirements with additional TVS diode