Product details

Vin (Min) (V) 3 Vin (Max) (V) 65 Features Enable, Linear control, Reverse current blocking, Reverse polarity protection Iq (Typ) (mA) 0.032 Iq (Max) (mA) 0.038 IGate source (Typ) (uA) 26.3 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 Channel(s) controlled (#) 1 FET External VGS (Max) (V) 13
Vin (Min) (V) 3 Vin (Max) (V) 65 Features Enable, Linear control, Reverse current blocking, Reverse polarity protection Iq (Typ) (mA) 0.032 Iq (Max) (mA) 0.038 IGate source (Typ) (uA) 26.3 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 Channel(s) controlled (#) 1 FET External 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 –33 V
  • Integrated VDS clamp for Input TVS less operation for ISO7637 pulse suppression
  • 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 30-mA boost regulator
  • Fast response to reverse current blocking: 0.5 µs
  • Active rectification up to 100 kHz
  • Adjustable overvoltage protection
  • Available in space saving 12-pin WSON package
  • Pin-to-pin compatible with LM74720-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 –33 V
  • Integrated VDS clamp for Input TVS less operation for ISO7637 pulse suppression
  • 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 30-mA boost regulator
  • Fast response to reverse current blocking: 0.5 µs
  • Active rectification up to 100 kHz
  • Adjustable overvoltage protection
  • Available in space saving 12-pin WSON package
  • Pin-to-pin compatible with LM74720-Q1

The LM74721-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 automotive battery powered ECUs. The device can withstand and protect the loads from negative supply voltages down to –33-V DC. An integrated ideal diode controller (GATE) drives the first MOSFET to replace a Schottky diode for reverse input protection and output voltage holdup. Integrated VDS clamp feature enables input TVS less system designs for automotive ISO7637 pulse suppression. A strong boost regulator with fast turn ON/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 LM74721-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 automotive battery powered ECUs. The device can withstand and protect the loads from negative supply voltages down to –33-V DC. An integrated ideal diode controller (GATE) drives the first MOSFET to replace a Schottky diode for reverse input protection and output voltage holdup. Integrated VDS clamp feature enables input TVS less system designs for automotive ISO7637 pulse suppression. A strong boost regulator with fast turn ON/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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Type Title Date
* Data sheet LM74721-Q1 TVS Less Low IQ Reverse Battery Protection Ideal Diode Controller With Active Rectification datasheet 14 Sep 2021
Technical article 3 ways to design a low quiescent-current (Iq) automotive reverse battery protection system 18 Nov 2021
Analog design journal Going TVS-less in Automotive Reverse Battery Protection Designs 18 Nov 2021
Application note Basics of Ideal Diodes (Rev. B) 05 Oct 2021
Application note Active Rectification and its Advantages in Automotive ECU Designs 29 Sep 2021
User guide LM74721EVM: Evaluation Module for LM74721-Q1 Ideal Diode Controller 15 Sep 2021

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Evaluation board

LM74721EVM — LM74721-Q1 evaluation module for ideal diode controller

TI's Evaluation Module LM74721EVM helps designers evaluate the operation and performance of the LM74721-Q1 ideal diode controller in reverse battery protection applications. This evaluation module demonstrates how LM74721-Q1 with integrated boost regulator for low IQ and fast transient response (...)

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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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