Product details

Vin (Min) (V) 3.2 Vin (Max) (V) 65 Features Enable, Reverse polarity protection Iq (Typ) (mA) 0.06 Iq (Max) (mA) 0.110 IGate source (Typ) (uA) 60 IGate sink (Typ) (mA) 2370 IGate pulsed (Typ) (A) 2.37 Operating temperature range (C) -40 to 125 Design support EVM Rating Catalog Channel(s) controlled (#) 1 FET External
Vin (Min) (V) 3.2 Vin (Max) (V) 65 Features Enable, Reverse polarity protection Iq (Typ) (mA) 0.06 Iq (Max) (mA) 0.110 IGate source (Typ) (uA) 60 IGate sink (Typ) (mA) 2370 IGate pulsed (Typ) (A) 2.37 Operating temperature range (C) -40 to 125 Design support EVM Rating Catalog Channel(s) controlled (#) 1 FET External
SOT-23-THN (DDF) 8 8 mm² 2.9 x 2.8
  • 3.2-V to 65-V input range (3.9-V start-up)
  • –65-V input reverse voltage rating
  • Integrated charge pump to drive
    • External back-to-back N-Channel MOSFETs
    • External high side switch MOSFET

    • External reverse polarity protection MOSFET

  • Gate drive variants
    • LM74502: 60-µA peak gate drive source capacity
    • LM74502H: 11-mA peak gate drive source capacity
  • 2.3-A peak gate sink current capacity
  • Enable pin feature
  • 45-µA typical operating quiescent current (EN/UVLO = High)
  • 1-µA shutdown current (EN/UVLO = Low)
  • Adjustable overvoltage and undervoltage protection
  • –40°C to +125°C ambient operating temperature range
  • Available in 8-pin SOT-23 package 2.90 mm × 1.60 mm
  • 3.2-V to 65-V input range (3.9-V start-up)
  • –65-V input reverse voltage rating
  • Integrated charge pump to drive
    • External back-to-back N-Channel MOSFETs
    • External high side switch MOSFET

    • External reverse polarity protection MOSFET

  • Gate drive variants
    • LM74502: 60-µA peak gate drive source capacity
    • LM74502H: 11-mA peak gate drive source capacity
  • 2.3-A peak gate sink current capacity
  • Enable pin feature
  • 45-µA typical operating quiescent current (EN/UVLO = High)
  • 1-µA shutdown current (EN/UVLO = Low)
  • Adjustable overvoltage and undervoltage protection
  • –40°C to +125°C ambient operating temperature range
  • Available in 8-pin SOT-23 package 2.90 mm × 1.60 mm

The LM74502, LM74502H is a controller which operates in conjunction with an external back-to-back connected N-channel MOSFETs to realize a low loss reverse polarity protection and load disconnect solution. The device can also be configured to drive high side MOSFET as a load switch with overvoltage protection . 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 input systems. The device can withstand and protect the loads from negative supply voltages down to –65 V. The LM74502, LM74502H does not have reverse current blocking and is suitable for input reverse polarity protection only.

The LM74502 controller provides a charge pump gate drive for an external N-channel MOSFET. With the enable pin low, the controller is off and draws approximately 1 µA of current, thus offering low system current when put into sleep mode. LM74502 and LM74502H offers programmable overvoltage and undervoltage protection which cuts off the load from the input source in case of these fault events. The devices are available in a 2.9 mm × 1.6 mm 8-pin DDF package and are specified over a –40°C to +125°C temperature range.

The LM74502, LM74502H is a controller which operates in conjunction with an external back-to-back connected N-channel MOSFETs to realize a low loss reverse polarity protection and load disconnect solution. The device can also be configured to drive high side MOSFET as a load switch with overvoltage protection . 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 input systems. The device can withstand and protect the loads from negative supply voltages down to –65 V. The LM74502, LM74502H does not have reverse current blocking and is suitable for input reverse polarity protection only.

The LM74502 controller provides a charge pump gate drive for an external N-channel MOSFET. With the enable pin low, the controller is off and draws approximately 1 µA of current, thus offering low system current when put into sleep mode. LM74502 and LM74502H offers programmable overvoltage and undervoltage protection which cuts off the load from the input source in case of these fault events. The devices are available in a 2.9 mm × 1.6 mm 8-pin DDF package and are specified over a –40°C to +125°C temperature range.

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Technical documentation

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Type Title Date
* Data sheet LM74502 Low IQ High Side Switch Controller With Reverse Polarity and Overvoltage Protection datasheet 20 Dec 2021
User guide LM74502EVM: Evaluation Module for LM74502 and LM74502H Ideal Diode Controllers (Rev. A) 20 Dec 2021
Application note Three Ways to Use High Side Switch Driver Using LM74502 20 Dec 2021
Certificate LM74502EVM EU RoHS Declaration of Conformity (DoC) 09 Dec 2021

Design & development

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Evaluation board

LM74502EVM — LM74502 and LM74502H evaluation module for ideal diode controller

LM74502EVM is an evaluation module for evaluating the performance of the ideal  diode controller with switched output, LM74502 and LM74502H. The LM74502 ideal diode controllers drive and control external back-to-back N-channel MOSFETs to emulate an ideal diode rectifier with power path ON (...)

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Simulation model

LM74502 PSpice Transient Model

SNOM743.ZIP (57 KB) - PSpice 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-THIN (DDF) 8 View options

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