Home Power management Power switches Ideal diode/ORing controllers
Home
Power management
Power switches
Ideal diode/ORing controllers

LM74703-Q1

ACTIVE

Automotive ideal diode controller with FET good output

Order now
Data sheet

LM74703-Q1

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 3.2 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) 0.08 Iq (max) (mA) 0.13 TI functional safety category Functional Safety-Capable FET External single FET IGate source (typ) (µA) 11000 IGate sink (typ) (mA) 2370 IGate pulsed (typ) (A) 2.37 Operating temperature range (°C) -40 to 125 VSense reverse (typ) (mV) -11 Design support EVM Rating Automotive Imax (A) 250 Shutdown current (ISD) (mA) (A) 0.001 Device type Ideal diode controller Product type Ideal diode controller
Vin (min) (V) 3.2 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) 0.08 Iq (max) (mA) 0.13 TI functional safety category Functional Safety-Capable FET External single FET IGate source (typ) (µA) 11000 IGate sink (typ) (mA) 2370 IGate pulsed (typ) (A) 2.37 Operating temperature range (°C) -40 to 125 VSense reverse (typ) (mV) -11 Design support EVM Rating Automotive Imax (A) 250 Shutdown current (ISD) (mA) (A) 0.001 Device type Ideal diode controller Product type Ideal diode controller
SOT-23-THN (DDF) 8 8.12 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
  • 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 pin 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
  • FETGOOD output to indicate external MOSFET health status
  • Fast response to reverse current blocking: < 0.75 µs
  • EMI performance over extended frequency range (150-kHz to 1-GHz)
  • Meets automotive ISO7637 transient requirements with external TVS Diode
  • 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
  • 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 pin 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
  • FETGOOD output to indicate external MOSFET health status
  • Fast response to reverse current blocking: < 0.75 µs
  • EMI performance over extended frequency range (150-kHz to 1-GHz)
  • Meets automotive ISO7637 transient requirements with external TVS Diode
  • 8-pin SOT-23 package 2.90 mm × 1.60 mm

The LM74703-Q1, LM74704-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 popular DC bus voltages such as 12-V, 24-V, and 48-V automotive battery systems. The 3.2-V input voltage support is designed especially 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 provides zero DC reverse current flow. Fast response (< 0.75 µs) to reverse current blocking makes the device applicable for systems with output voltage holdup requirements during ISO7637 pulse testing as well as power fail and input micro-short conditions. LM74703-Q1, LM74704-Q1 has FETGOOD output to indicate external MOSFET drain to source short or open condition. The device features enable pin (EN). With the enable pin low, the controller is off and draws approximately 1-µA of current.

The LM74703-Q1, LM74704-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 popular DC bus voltages such as 12-V, 24-V, and 48-V automotive battery systems. The 3.2-V input voltage support is designed especially 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 provides zero DC reverse current flow. Fast response (< 0.75 µs) to reverse current blocking makes the device applicable for systems with output voltage holdup requirements during ISO7637 pulse testing as well as power fail and input micro-short conditions. LM74703-Q1, LM74704-Q1 has FETGOOD output to indicate external MOSFET drain to source short or open condition. The device features enable pin (EN). With the enable pin low, the controller is off and draws approximately 1-µA of current.
filter Find other Ideal diode/ORing controllers
Download View video with transcript Video

Similar products you might be interested in

open-in-new Compare alternates
Drop-in replacement with upgraded functionality to the compared device
LM74704-Q1 ACTIVE Automotive ideal diode controller with FET good open-drain output Open-drain output variant
Same functionality with different pin-out to the compared device
LM74700-Q1 ACTIVE 3.2-V to 65-V, 80-uA IQ automotive ideal diode controller Same function without FET good output

Technical documentation

star =Top documentation for this product selected by TI
No results found. Please clear your search and try again.
View all 3
Type Title Date
* Data sheet LM74703-Q1, LM74704-Q1 Automotive Ideal Diode Controller With External FET Health Indication datasheet (Rev. A) PDF | HTML 07 Dec 2023
Functional safety information LM74703-Q1 and LM74704-Q1 Functional Safety FIT Rate, FMD and Pin FMA PDF | HTML 06 Jun 2024
EVM User's guide LM74704Q1EVM, LM74703-Q1, LM74704-Q1 Evaluation Module for Ideal Diode Controlle PDF | HTML 23 May 2023

Design & development

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

Evaluation board

LM74704Q1EVM — LM74704-Q1 and LM74703-Q1 evaluation module for ideal diode controllers

The LM74704Q1EVM evaluation module (EVM) helps to evaluate the operation and performance of the LM74703-Q1 and LM74704-Q1 ideal diode controllers in reverse battery protection applications. This EVM demonstrates how the LM74704-Q1 operates in conjunction with an external N-channel MOSFET as an (...)

User guide: PDF | HTML
Not available on TI.com
Simulation model

LM74703-Q1 PSpice Transient Model

SNOM788.ZIP (43 KB) - PSpice Model
Download
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 (...)
Request
Package Pins CAD symbols, footprints & 3D models
SOT-23-THN (DDF) 8 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring
Information included:
  • Fab location
  • Assembly location

Recommended products may have parameters, evaluation modules or reference designs related to this TI product.

Support & training

TI E2E™ forums with technical support from TI engineers

View all forum topics

Content is provided "as is" by TI and community contributors and does not constitute TI specifications. See terms of use.

If you have questions about quality, packaging or ordering TI products, see TI support. ​​​​​​​​​​​​​​

Videos