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Product details

Parameters

Vin (Min) (V) 3.2 Vin (Max) (V) 65 Iq (Typ) (mA) 0.08 Iq (Max) (mA) 0.13 IGate source (Typ) (uA) 11000 IGate pulsed (Typ) (A) 2.3 Operating temperature range (C) -40 to 125 Rating Automotive Channel(s) controlled (#) 1 FET External open-in-new Find other Ideal diode/ORing controllers

Package | Pins | Size

SOT-23-THN (DDF) 8 8 mm² 2.9 x 2.8 open-in-new Find other Ideal diode/ORing controllers

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)
  • –65-V input reverse voltage rating
  • Charge pump for external N-Channel MOSFET
  • Enable pin feature
  • 1-µA shutdown current (EN=Low)
  • 80-µA typical operating quiescent current (EN=High)
  • Meets automotive ISO7637 pulse 1 transient requirements with additional TVS Diode
  • Available in 8-pin SOT-23 package 2.90 mm × 1.60 mm

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Description

The LM74500-Q1 is an automotive AEC Q100 qualified controller which operates in conjunction with an external N-channel MOSFET as a low loss reverse polarity protection solution. 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 automotive systems. The device can withstand and protect the loads from negative supply voltages down to –65 V. The LM74500-Q1 does not have reverse current blocking and is suitable for input reverse poalrity protection of loads that can potentially deliver energy back to the input supply such as automotive body control module motor loads.

The LM74500-Q1 controller provides a charge pump gate drive for an external N-channel MOSFET. The high voltage rating of LM74500-Q1 helps to simplify the system designs for automotive ISO7637 protection. With the enable pin low, the controller is off and draws approximately 1 µA of current thus offering low system current when put into sleep mode.

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Technical documentation

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Type Title Date
* Datasheet LM74500-Q1 Reverse Polarity Protection Controller datasheet Dec. 23, 2020
User guide LM74500-Q1 Evaluation Module Dec. 10, 2020
More literature LM74500Q1EVM EU RoHS Declaration of Conformity (DoC) Dec. 03, 2020

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
document-generic User guide
49
Description

The LM74500-Q1 evaluation module (LM74500Q1EVM) helps designers evaluate the operation and performance of the LM74500-Q1 reverse polarity protection controller. This evaluation module demonstrates how an N-channel power MOSFET can be used to realize input reverse voltage protection with low IQ (...)

Features
  • Reverse battery protection
  • Very low shutdown current
  • Meets automotive ISO 7637-2 standard
EVALUATION BOARD Download
document-generic User guide
49
Description

The LM74700DDFEVM helps designers evaluate the operation and performance of the LM74700-Q1 3.2-V to 65-V, 80-μA IQ automotive ideal diode controller (DDF package). This evaluation module demonstrates how an N-channel power MOSFET can emulate a very-low forward voltage diode with low IQ and (...)

Features
  • Reverse battery protection
  • Very low shutdown current
  • Meets automotive ISO 7637-2 standard
  • Fast response to reverse current blocking

Design tools & simulation

SIMULATION MODEL Download
SNOM705.ZIP (73 KB) - PSpice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
SOT-23-THIN (DDF) 8 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
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  • Qualification summary
  • Ongoing reliability monitoring

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