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Product details

Parameters

Vin (Min) (V) 3.2 Vin (Max) (V) 65 Features Enable, Linear control, Reverse current blocking, Reverse polarity protection Iq (Typ) (mA) 0.08 Iq (Max) (mA) 0.13 IGate source (Typ) (uA) 11000 IGate sink (Typ) (mA) 2370 IGate pulsed (Typ) (A) 2.3 Operating temperature range (C) -50 to 125 VSense reverse (Typ) (mV) -11 Design support EVM Rating HiRel Enhanced Product 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

  • 3.2-V to 65-V Input range (3.9-V startup)
  • –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
  • Available in 8 pin SOT-23 package 2.90 mm × 1.60 mm
  • Military temperature range –55°C to +125°C
  • One fabrication, assembly and test site
  • Extended product life cycle
  • Extended product change notification
  • Product traceability
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Description

The LM74700-EP is an 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 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 power fail and input micro-short conditions.

The LM74700-EP controller provides a charge pump gate drive for an external N-channel MOSFET. The high voltage rating of LM74700-EP 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. The LM74700-EP is fully specified over the temperature range of TA = –55°C to +125°C.

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LM74700-Q1 ACTIVE 3.2-V to 65-V, 80-uA IQ automotive ideal diode controller Automotive version, -40 C to 125 C operation

Technical documentation

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Type Title Date
* Data sheet LM74700-EP Low IQ Ideal Diode Controller datasheet Sep. 01, 2021
* Radiation & reliability report LM74700-EP Reliability Report Sep. 01, 2021

Design & development

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Hardware development

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
SNOM667.ZIP (64 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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  • Qualification summary
  • Ongoing reliability monitoring

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