LT1374

PRODUCTION

4.5A, 500kHz Step-Down Switching Regulator

Data Sheet Product Selection Table
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Overview

  • Constant 500kHz Switching Frequency
  • High Power 16-Pin TSSOP Package Available
  • Uses All Surface Mount Components
  • Inductor Size Reduced to 1.8µH
  • Saturating Switch Design: 0.07Ω
  • Effective Supply Current: 2.5mA
  • Shutdown Current: 20µA
  • Cycle-by-Cycle Current Limiting
  • Easily Synchronizable

The LT1374 is a 500kHz monolithic buck mode switching regulator. A 4.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. High switching frequency allows a considerable reduction in the size of external components. The topology is current mode for fast transient response and good loop stability. Both fixed output voltage and adjustable parts are available.

A special high speed bipolar process and new design techniques achieve high efficiency at high switching frequency. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch.

The LT1374 is available in standard 7-pin DD, TO-220, fused lead SO-8 and 16-pin exposed pad TSSOP packages. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts may be used, including the inductor and capacitors. There is the optional function of shutdown or synchronization. A shutdown signal reduces supply current to 20µA. Synchronization allows an external logic level signal to increase the internal oscillator from 580kHz to 1MHz.

Applications

  • Portable Computers
  • Battery-Powered Systems
  • Battery Chargers
  • Distributed Power
LT1374
4.5A, 500kHz Step-Down Switching Regulator
5V Buck Converter Efficiency vs Load Current Product Package 1 Product Package 2 Product Package 3 Product Package 4
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 2

Application Note 1

Design Note 1

Technical Articles 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Circuit Monitors 1
LTC2960
RECOMMENDED FOR NEW DESIGNS 36V Nano-Current Two-Input Voltage Monitor
Oscillators 1
LTC6909
PRODUCTION 1 to 8 Output, Multiphase Silicon Oscillator with Spread Spectrum Modulation
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Protection Switches & Controllers 1
LT4363
RECOMMENDED FOR NEW DESIGNS High Voltage Surge Stopper with Current Limit
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LT1374
  • LT1374-5
  • LT1374HV
  • LT1374HV-5
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

DC188A-B

LT1374CS8-SYNC | 4.5A Switch, 500kHz Step-Down Regulator, 5.5V to 25VIN, 3.3V or 5.0V @ 4A Output, SO8 Package

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Product Details

eval board
schematic 1
DC187A-B

LT1374CR-SYNC | 4.5A SWITCH, 500kHz STEP-DOWN REGULATOR, 5.5V to 25VIN, 3.3V or 5.0V @ 4A OUTPUT, DD PACKAGE

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Product Details

DC187A-B: Demo Board for the LT1374 4.5A, 500kHz Step-Down Switching Regulator.


 


eval board
schematic 2
DC187A-A

LT1374CR | 4.5A SWITCH, 500kHz STEP-DOWN REGULATOR, 5.5V to 25VIN, 3.3V or 5.0V @ 4A OUTPUT, DD PACKAGE

Buy Now View Details

Product Details

DC187A-A: Demo Board for the LT1374 4.5A, 500kHz Step-Down Switching Regulator.


 


eval board
schematic 3
DC474A

LT1374CFE | 4A, 500KHz Step Down Switching Regulator, 5-25VIN up to 4A, Jumper Selectable 3.3 or 5VOUT

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Product Details

DC474A: Demo Board for LT1374 4.5A, 500kHz Step-Down Switching Regulator.


 
DC188A-B
LT1374CS8-SYNC | 4.5A Switch, 500kHz Step-Down Regulator, 5.5V to 25VIN, 3.3V or 5.0V @ 4A Output, SO8 Package
DC187A-B
LT1374CR-SYNC | 4.5A SWITCH, 500kHz STEP-DOWN REGULATOR, 5.5V to 25VIN, 3.3V or 5.0V @ 4A OUTPUT, DD PACKAGE
DC187A-A - Schematic
DC188A-A
LT1374CS8 | 4.5A Switch, 500kHz Step-Down Regulator, 5.5V to 25VIN, 3.3V or 5.0V @ 4A Output, SO8 Package
DC187A-A
LT1374CR | 4.5A SWITCH, 500kHz STEP-DOWN REGULATOR, 5.5V to 25VIN, 3.3V or 5.0V @ 4A OUTPUT, DD PACKAGE
DC187A-A - Schematic
DC474A
LT1374CFE | 4A, 500KHz Step Down Switching Regulator, 5-25VIN up to 4A, Jumper Selectable 3.3 or 5VOUT
DC474A - Schematic

Reference Designs

DK-100G-5SGXEA7N Dev Kit
DK-100G-5SGXEA7N Dev Kit
DK-100G-5SGXEA7N Parts List
DK-100G-5SGXEA7N Block Diagram
DK-100G-5SGXEA7N Block Diagram
DK-100G-5SGXEA7N Power Tree
Altera 100G Development Kit, Stratix V Edition Circuits from the lab

View Detailed Reference Design

Features and Benefits

  • Analog Devices has worked closely with FPGA and processor manufacturers to develop verified power solutions that optimize cost, size and efficiency in high performance applications
  • Our reference designs are supported by an intuitive design tool set and IP
  • Our team can provide designs for quick prototypes that can speed time to market in the most complex applications
Altera 100G Development Kit, Stratix V Edition
DK-100G-5SGXEA7N Dev Kit
DK-100G-5SGXEA7N Parts List
DK-100G-5SGXEA7N Block Diagram
DK-100G-5SGXEA7N Block Diagram
DK-100G-5SGXEA7N Power Tree

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