1 Features
· AEC-Q100 Qualified with the following results
- Device temperature grade 1:
- 40℃ to +125℃ Ambient operating temperature range
- Device HBM ESD classification level2
- Device CDM ESD classification level C4B
· 3.2-V to 65-V Input range(3.9-V start up)
· -65-V Reverse voltage rating
· Charge pump for external N-Channel MOSFET
· 20-mV ANODE to CATHODE forward voltage drop regulation
· Enable pin feature
· 1-uA Shutdown current(EN=Low)
· 80-uAOperating quiescent curent(EN=High)
· 2.3-A Peak gate turnoff current
· Fast response to reverse curent blocking:<0.75us
· Meets automotive ISO7637 transient requirements with a suitable TVS Diode
· 6-Pin SOT-23 Package 2.90mm ×1.60mm
2 Applications
· Automotive ADAS systems-camera
· Automotive infotainment systems-digital cluster, head unit
· Industrial factory automation-PLC
· Enterprise power supplies
· Active ORing for redundant power
Typical Application Schematic
3 Description
The LM74700-Q1 is an automotive AEC Q100 qualified ideal diode controller which operates in conjunction with an external N-channel MOSFET as an ideal diode rectifier for low loss reverse polarity protection with a 20-mV forward voltage drop. The wide supply input range of 3.2 V to 65 V allows control of many popular DC bus voltages such as 12-V,24-V and 48-V automotive battery systems. The 3.2-V input voltage support is particularly well suited for severe cold crank requirements in automotivesystems. The device can withstand and protect the loads from negative supply voltages down to-65 V.
The device controls the GATE of the MOSFET to regulate the forward voltage drop at 20-mV. The regulation scheme enables graceful turn off of the MOSFET during a reverse current event and ensures zero DC reverse current flow. Fast response(<0.75 us) to Reverse Current Blocking makes the devicesuitable for systems with output voltage holdup requirements during ISO7637 pulse testing as well as power fail and input micro-short conditions.
The LM74700-Q1 controller provides a charge pump gate drive for an external N-channel MOSFET. The high voltage rating of LM74700-Q1 helps to simplify the system designs for automotive ISO7637 protection. With the enable pin low, the controller is off and draws approximately 1-uA of current.
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