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LM74670-Q1

ACTIVE

0.48-V to 42-V, zero IQ automotive ideal diode rectifier controller with 70uA gate drive

Product details

Vin (min) (V) 0.48 Vin (max) (V) 42 Number of channels 1 Features Automotive load dump compatibility, Linear control, Reverse current blocking, Reverse polarity protection Iq (typ) (mA) 0 Iq (max) (mA) 0 FET External single FET IGate source (typ) (µA) 70 IGate source (max) (µA) 67 IGate sink (typ) (mA) 0.07 IGate pulsed (typ) (A) 0.1 Operating temperature range (°C) -40 to 125 IReverse (typ) (µA) 110 VSense reverse (typ) (mV) 20 Design support EVM, Reference Design, Simulation Model Rating Automotive Imax (A) 250 VGS (max) (V) 2.5 Device type Ideal diode controller Product type Ideal diode controller
Vin (min) (V) 0.48 Vin (max) (V) 42 Number of channels 1 Features Automotive load dump compatibility, Linear control, Reverse current blocking, Reverse polarity protection Iq (typ) (mA) 0 Iq (max) (mA) 0 FET External single FET IGate source (typ) (µA) 70 IGate source (max) (µA) 67 IGate sink (typ) (mA) 0.07 IGate pulsed (typ) (A) 0.1 Operating temperature range (°C) -40 to 125 IReverse (typ) (µA) 110 VSense reverse (typ) (mV) 20 Design support EVM, Reference Design, Simulation Model Rating Automotive Imax (A) 250 VGS (max) (V) 2.5 Device type Ideal diode controller Product type Ideal diode controller
VSSOP (DGK) 8 14.7 mm² 3 x 4.9
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature Range
    • Exceeds HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C4B
  • Peak Input AC Voltage: 42 V
  • Zero IQ
  • Charge Pump Gate Driver for external N-Channel MOSFET
  • Low Forward-Voltage Drop and Less Power Dissipation Compared to Schottky Diode
  • Capable of handling AC signal up to 300-Hz Frequency
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to +125°C Ambient Operating Temperature Range
    • Exceeds HBM ESD Classification Level 2
    • Device CDM ESD Classification Level C4B
  • Peak Input AC Voltage: 42 V
  • Zero IQ
  • Charge Pump Gate Driver for external N-Channel MOSFET
  • Low Forward-Voltage Drop and Less Power Dissipation Compared to Schottky Diode
  • Capable of handling AC signal up to 300-Hz Frequency

The LM74670-Q1 is a controller device that can be used with an N-Channel MOSFET in full or half bridge rectifier architectures for alternators. It is designed to drive an external MOSFET to emulate an ideal diode. A unique advantage of this scheme is that it is not ground referenced, thus it has zero IQ. The schottky diodes in full or half bridge rectifiers and alternators can be replaced with the LM74670-Q1 solution to avoid forward conduction diode losses and produce more efficient AC-DC converters.

The LM74670-Q1 controller provides a gate drive for external N-Channel MOSFET and a fast response internal comparator to pull-down the MOSFET Gate in the event of reverse polarity. This device can support an AC signal frequency up to 300Hz.

The LM74670-Q1 is a controller device that can be used with an N-Channel MOSFET in full or half bridge rectifier architectures for alternators. It is designed to drive an external MOSFET to emulate an ideal diode. A unique advantage of this scheme is that it is not ground referenced, thus it has zero IQ. The schottky diodes in full or half bridge rectifiers and alternators can be replaced with the LM74670-Q1 solution to avoid forward conduction diode losses and produce more efficient AC-DC converters.

The LM74670-Q1 controller provides a gate drive for external N-Channel MOSFET and a fast response internal comparator to pull-down the MOSFET Gate in the event of reverse polarity. This device can support an AC signal frequency up to 300Hz.

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Technical documentation

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Type Title Date
* Data sheet LM74670-Q1 Zero IQ Smart Diode Rectifier Controller datasheet (Rev. A) PDF | HTML 27 Oct 2015
E-book 11 Ways to Protect Your Power Path 03 Jul 2019
EVM User's guide LM74670-SQEVM User's Guide 20 Oct 2015

Design & development

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

Evaluation board

LM74670-SQEVM — Reverse Polarity Protection Smart Diode Controller Evaluation Module

The LM74670-SQEVM evaluation module demostrates reverse polarity protection as a replacement of Schottkey Diodes and P-Channel MOSFETs. In this reverse polarity protection solution the LM74670 Smart Diode Controller is used to provide a gate drive for 40V (VDS) external N-Channel MOSFET. The (...)

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

LM74670-Q1 TINA-TI Transient Reference Design

SNOM665.TSC (597 KB) - TINA-TI Reference Design
Simulation model

LM74670-Q1 TINA-TI Transient Spice Model

SNOM664.ZIP (30 KB) - TINA-TI Spice Model
Simulation model

LM74670-Q1 Unencrypted PSpice Transient Model Package (Rev. A)

SNOM561A.ZIP (55 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 (...)
Reference designs

TIDA-00858 — Novel, High Efficiency Full-Bridge Rectifier Reference Design

TIDA-00858 implements a high-efficiency approach to fullbridge rectifier. This reference design replaces diodes with four N-Channel MOSFETs,combined with LM74670-Q1 smart diode controllers in a full-bridge rectifier configuration. LM74670-Q1 is an effective zero-IQ replacement of diode loss. This (...)
Design guide: PDF
Schematic: PDF
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VSSOP (DGK) 8 View options

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