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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 Features Linear Control Operating temperature range (C) -40 to 125 VSense reverse (Typ) (mV) -11 Rating Automotive Channel(s) controlled (#) 1 FET External open-in-new Find other Ideal diode/ORing controllers

Package | Pins | Size

SOT-23 (DBV) 6 5 mm² 2.9 x 1.6 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
  • Functional safety capable
    • Documentation available to aid functional safety system design
  • 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-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:
    < 0.75 µs
  • Meets automotive ISO7637 transient requirements with a suitable TVS Diode
  • 6-Pin SOT-23 Package 2.90 mm × 1.60 mm

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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 automotive systems. 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 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 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-µA of current.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 11
Type Title Date
* Datasheet LM74700-Q1 Low IQ Reverse Battery Protection Ideal Diode Controller datasheet (Rev. F) Dec. 17, 2019
Technical articles Meet airline restrictions with power-path control for dual batteries Jul. 21, 2020
White papers Streamlining Functional Safety Certification in Automotive and Industrial Jun. 09, 2020
Application notes LM74700-Q1 Functional Safety FIT Rate and Failure Mode Distribution Dec. 16, 2019
White papers 11 Ways to Protect Your Power Path white paper Jul. 03, 2019
Application notes Basics of Ideal Diodes May 09, 2019
Application notes Basics of Power Switches (Rev. A) Apr. 26, 2019
User guides LM74700 Evaluation Module (Rev. A) Feb. 11, 2019
Technical articles How can a load switch extend your device’s battery life? Mar. 20, 2018
Technical articles How and why you should use load switches for power sequencing Feb. 06, 2018
Technical articles How to use load switches and eFuses in your set-top box design Nov. 23, 2017

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
49
Description
TI's LM74700-Q1 evaluation module (LM74700EVM) helps designers evaluate the operation and performance of the LM74700-Q1 smart diode controller. This evaluation module demonstrates how an N-channel power MOSFET can emulate a very-low forward voltage diode with low IQ and low-leakage current flowing (...)
Features
  • Reverse battery protection
  • Very low shutdown current
  • Meets sutomotive ISO 7637-2 standard
  • Fast response to reverse current blocking

Design tools & simulation

SIMULATION MODELS Download
SNOM667.ZIP (64 KB) - PSpice Model
SIMULATION MODELS Download
SNOM691.TSC (149 KB) - TINA-TI Spice Model
SIMULATION TOOLS 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
  • (...)

Reference designs

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CAD/CAE symbols

Package Pins Download
SOT-23 (DBV) 6 View options

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