描述 Description

The LM74701-Q1 is an automotive AEC Q100 qualified ideal diode controller which operates in conjunction with an external N-channel MOSFET as an ideal diode for low loss reverse polarity protection with a 20-mV forward voltage drop. LM74701-Q1 is suitable for input protection of 12-V automotive systems. The 3.2-V input voltage support is particularly well suited for severe cold crank requirements in automotive systems.

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 μs) to Reverse Current Blocking makes the device suitable for systems with output voltage holdup requirements during ISO7637 pulse testing as well as power fail and input micro-short conditions. The LM74701-Q1 has an unique integrated VDS clamp feature which enables users to achieve \"TVS Less\" input polarity protection solution and save on average a typical 60% of PCB space in constrained automotive systems.

The LM74701-Q1 controller provides a charge pump gate drive for an external N-channel MOSFET. With the enable pin low, the controller is off and draws approximately 1 μA of current.

特性 Features

? AEC-Q100 qualified with the following results
? 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

? 3.2-V to 65-V input range (3.9-V start up)
? –33-V reverse voltage rating
? Charge pump for external N-Channel MOSFET
? 20-mV ANODE to CATHODE forward voltage drop regulation
? 1-μA shutdown current (EN = Low)
? 80-μA operating quiescent current (EN = High)
? 2.3-A peak gate turnoff current
? Fast response to reverse current blocking: