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LM74720-Q1

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Automotive, low IQ ideal diode controller with active rectification and load dump protection

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Data sheet

LM74720-Q1

ACTIVE
Data sheet Order now

Product details

Vin (Min) (V) 3 Vin (Max) (V) 65 Number of channels (#) 1 Features Automotive load dump compatibility, Enable, Linear control, Reverse current blocking, Reverse polarity protection Iq (Typ) (mA) 0.032 Iq (Max) (mA) 0.038 FET External single FET, External back-to-back FET IGate sink (Typ) (mA) 2.1 IGate pulsed (Typ) (A) 2.1 Operating temperature range (C) -40 to 125 VSense reverse (Typ) (mV) -6.5 Design support EVM Rating Automotive VGS (Max) (V) 13
Vin (Min) (V) 3 Vin (Max) (V) 65 Number of channels (#) 1 Features Automotive load dump compatibility, Enable, Linear control, Reverse current blocking, Reverse polarity protection Iq (Typ) (mA) 0.032 Iq (Max) (mA) 0.038 FET External single FET, External back-to-back FET IGate sink (Typ) (mA) 2.1 IGate pulsed (Typ) (A) 2.1 Operating temperature range (C) -40 to 125 VSense reverse (Typ) (mV) -6.5 Design support EVM Rating Automotive VGS (Max) (V) 13
WSON (DRR) 12 9 mm² 3 x 3
  • 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-V to 65-V input range
  • Reverse input protection down to –65 V
  • Low quiescent current, 35 µA (max) in operation
  • Low 3.3-µA (max) shutdown current (EN = Low)
  • Ideal diode operation with 17-mV A to C forward voltage drop regulation
  • Drives external back-to-back N-Channel MOSFETs
  • Integrated 29-mA boost regulator
  • Fast response to reverse current blocking: 0.5 µs
  • Active rectification up to 100 kHz
  • Adjustable overvoltage protection
  • Meets automotive ISO7637 transient requirements with a suitable TVS diode
  • Available in space saving 12-pin WSON package
  • Pin-to-pin compatible with LM74721-Q1
  • 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-V to 65-V input range
  • Reverse input protection down to –65 V
  • Low quiescent current, 35 µA (max) in operation
  • Low 3.3-µA (max) shutdown current (EN = Low)
  • Ideal diode operation with 17-mV A to C forward voltage drop regulation
  • Drives external back-to-back N-Channel MOSFETs
  • Integrated 29-mA boost regulator
  • Fast response to reverse current blocking: 0.5 µs
  • Active rectification up to 100 kHz
  • Adjustable overvoltage protection
  • Meets automotive ISO7637 transient requirements with a suitable TVS diode
  • Available in space saving 12-pin WSON package
  • Pin-to-pin compatible with LM74721-Q1

The LM74720-Q1 ideal diode controller drives and controls external back-to-back N-Channel MOSFETs to emulate an ideal diode rectifier with power path ON/OFF control and overvoltage protection. The wide input supply of 3 V to 65 V allows protection and control of 12-V and 24-V automotive battery powered ECUs. The device can withstand and protect the loads from negative supply voltages down to –65 V. An integrated ideal diode controller (GATE) drives the first MOSFET to replace a Schottky diode for reverse input protection and output voltage holdup. A strong boost regulator with fast turn ON and OFF comparators ensures robust and efficient MOSFET switching performance during automotive testing such as ISO16750 or LV124 where an ECU is subjected to input short interruptions and AC superimpose input signals up to 100-kHz frequency. Low Quiescent Current 35 µA (maximum) in operation enables always ON system designs. With a second MOSFET in the power path, the device allows load disconnect control using EN pin. Quiescent current reduces to 3.3 µA (maximum) with EN low. The device features an adjustable overvoltage cut-off protection feature for load dump protection.

The LM74720-Q1 ideal diode controller drives and controls external back-to-back N-Channel MOSFETs to emulate an ideal diode rectifier with power path ON/OFF control and overvoltage protection. The wide input supply of 3 V to 65 V allows protection and control of 12-V and 24-V automotive battery powered ECUs. The device can withstand and protect the loads from negative supply voltages down to –65 V. An integrated ideal diode controller (GATE) drives the first MOSFET to replace a Schottky diode for reverse input protection and output voltage holdup. A strong boost regulator with fast turn ON and OFF comparators ensures robust and efficient MOSFET switching performance during automotive testing such as ISO16750 or LV124 where an ECU is subjected to input short interruptions and AC superimpose input signals up to 100-kHz frequency. Low Quiescent Current 35 µA (maximum) in operation enables always ON system designs. With a second MOSFET in the power path, the device allows load disconnect control using EN pin. Quiescent current reduces to 3.3 µA (maximum) with EN low. The device features an adjustable overvoltage cut-off protection feature for load dump protection.
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Technical documentation

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Type Title Date
* Data sheet LM74720-Q1 Low IQ Automotive Ideal Diode Controller with Active Rectification and Load Dump Protection datasheet (Rev. B) PDF | HTML 29 Mar 2022
Technical article 3 ways to design a low quiescent-current (Iq) automotive reverse battery protection system 18 Nov 2021
Application note Basics of Ideal Diodes (Rev. B) PDF | HTML 05 Oct 2021
Application note Active Rectification and its Advantages in Automotive ECU Designs PDF | HTML 29 Sep 2021
User guide LM7472EVM: Evaluation Module for LM74720-Q1 & LM74722-Q1 Ideal Diode Controllers PDF | HTML 15 Sep 2021
Analog Design Journal Automotive EMC-compliant reverse-battery protection with ideal-diode controllers 22 Sep 2020

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Evaluation board

LM7472EVM — LM74720-Q1 and LM74722-Q1 evaluation module for ideal diode controllers

TI's Evaluation Module LM7472EVM helps designers evaluate the operation and performance of the LM74720-Q1 and LM74722-Q1 ideal diode controllers in reverse battery protection applications. This evaluation module demonstrates how LM7472x-Q1 with integrated boost regulator for Low IQ and fast (...)

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LM7472x-Q1 PSpice Transient Model

SLVMDO2.ZIP (84 KB) - PSpice Model
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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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