Product details

Vin (Min) (V) 3.2 Vin (Max) (V) 65 Features Linear control, Enable, Reverse polarity protection, Reverse current blocking 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) -40 to 125 VSense reverse (Typ) (mV) -11 Design support EVM Rating Automotive Channel(s) controlled (#) 1 FET External
Vin (Min) (V) 3.2 Vin (Max) (V) 65 Features Linear control, Enable, Reverse polarity protection, Reverse current blocking 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) -40 to 125 VSense reverse (Typ) (mV) -11 Design support EVM Rating Automotive Channel(s) controlled (#) 1 FET External
SOT-23 (DBV) 6 5 mm² 2.9 x 1.6 SOT-23-THN (DDF) 8 8 mm² 2.9 x 2.8
  • 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
  • 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
  • Available in 6-pin and 8-pin SOT-23 Package 2.90 mm × 1.60 mm
  • 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
  • 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
  • Available in 6-pin and 8-pin SOT-23 Package 2.90 mm × 1.60 mm

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.

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

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Type Title Date
* Data sheet LM74700-Q1 Low IQ Reverse Battery Protection Ideal Diode Controller datasheet (Rev. G) 21 Dec 2020
Application note Basics of Ideal Diodes (Rev. B) 05 Oct 2021
Certificate Automotive PPAP Documentation 18 Jun 2021
Analog design journal Multibattery management in medical ultrasound systems (Rev. A) 21 Jan 2021
User guide LM74700DDFEVM: Evaluation Module for LM74700-Q1 10 Dec 2020
Technical article Meet airline restrictions with power-path control for dual batteries 21 Jul 2020
White paper Streamlining Functional Safety Certification in Automotive and Industrial 09 Jun 2020
White paper 簡化汽車及工業領域的功 能安全認證 09 Jun 2020
White paper 자동차 및 산업 분야의 기능적 안전성 인증 간소화 09 Jun 2020
Functional safety information LM74700-Q1 Functional Safety FIT Rate and Failure Mode Distribution 16 Dec 2019
E-book 11 Ways to Protect Your Power Path white paper 03 Jul 2019
Application note Basics of Power Switches (Rev. A) 26 Apr 2019
User guide LM74700 Evaluation Module (Rev. A) 11 Feb 2019

Design & development

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Evaluation board

LM74700DDFEVM — LM74700-Q1 3.2-V to 65-V, 80-μA IQ automotive ideal diode controller (DDF package) evaluation module

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 (...)

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Evaluation board

LM74700EVM — LM74700 evaluation module

The 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 through the IC.
In stock
Limit: 5
Simulation model

LM74700-Q1 PSpice Transient Model

SNOM667.ZIP (64 KB) - PSpice Model
Simulation model

LM74700-Q1 TINA-TI Transient Model

SNOM691.TSC (149 KB) - TINA-TI Spice Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

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 (...)
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SOT-23 (DBV) 6 View options
SOT-23-THIN (DDF) 8 View options

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