LM74700QDBVRQ1

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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