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LM74700-Q1

ACTIVE

3.2-V to 65-V, 80-uA IQ automotive ideal diode controller

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LM74700D-Q1 ACTIVE Automotive, 3.2-V to 70-V, 80-µA reverse battery protection ideal diode controller Newer device with higher absolute maximum rating and SOIC package

LM74700-Q1

ACTIVE
Data sheet Order now

Product details

Vin (max) (V) 65 Vin (min) (V) 3.2 FET External single FET Device type Ideal diode controller Number of channels 1 Rating Automotive Features Automotive load dump compatibility, Enable, Linear control, Reverse current blocking, Reverse polarity protection Imax (A) 250 Iq (typ) (mA) 0.08 Iq (max) (mA) 0.13 TI functional safety category Functional Safety-Capable IGate source (typ) (µA) 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 Shutdown current (ISD) (mA) (A) 0.001 Product type Ideal diode controller
Vin (max) (V) 65 Vin (min) (V) 3.2 FET External single FET Device type Ideal diode controller Number of channels 1 Rating Automotive Features Automotive load dump compatibility, Enable, Linear control, Reverse current blocking, Reverse polarity protection Imax (A) 250 Iq (typ) (mA) 0.08 Iq (max) (mA) 0.13 TI functional safety category Functional Safety-Capable IGate source (typ) (µA) 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 Shutdown current (ISD) (mA) (A) 0.001 Product type Ideal diode controller
SOT-23-THN (DDF) 8 8.12 mm² (2.9 mm × 2.8 mm) SOT-23 (DBV) 6 8.12 mm² (2.9 mm × 2.8 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
  • 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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Top documentation Type Title Format options Date
* Data sheet LM74700-Q1 Low IQ Reverse Battery Protection Ideal Diode Controller datasheet (Rev. G) PDF | HTML Dec 21, 2020
Application brief Full-Featured Automotive Side Mirror PDF | HTML Mar 15, 2024
Analog design Journal Redundant supply topologies for automotive applications using ideal diode controllers PDF | HTML Feb 14, 2024
Analog design Journal Multibattery management in medical ultrasound systems (Rev. B) PDF | HTML Jun 8, 2023
Application brief Implementation of Test Pulses in Digital Output Modules PDF | HTML Mar 4, 2022
Application note Basics of Ideal Diodes (Rev. B) PDF | HTML Oct 5, 2021
Certificate Automotive PPAP Documentation Jun 18, 2021
Technical article Meet airline restrictions with power-path control for dual batteries PDF | HTML Jul 21, 2020
Functional safety information Streamlining Functional Safety Certification in Automotive and Industrial Jun 9, 2020
Functional safety information LM74700-Q1 Functional Safety FIT Rate and Failure Mode Distribution Dec 16, 2019
E-book 11 Ways to Protect Your Power Path Jul 3, 2019
Application note Basics of Power Switches (Rev. A) PDF | HTML Apr 26, 2019

Design & development

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

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 (...)

User guide: PDF | HTML
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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.
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Simulation model

LM74700-Q1 PSpice Transient Model

SNOM667.ZIP (64 KB) - PSpice model
Supported products & hardware
Simulation model

LM74700-Q1 TINA-TI Transient Model

SNOM691.TSC (149 KB) - TINA-TI Spice model
Supported products & hardware

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SOT-23-THN (DDF) 8 Ultra Librarian
SOT-23 (DBV) 6 Ultra Librarian
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