LTC1874

PRODUCTION

Dual Constant Frequency Current Mode Step-Down DC/DC Controller

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Overview

  • High Efficiency: Up to 94%
  • High Output Currents Easily Achieved
  • Wide VIN Range: 2.5V to 9.8V
  • Constant Frequency 550kHz Operation
  • Burst Mode™ Operation at Light Load
  • Low Dropout: 100% Duty Cycle
  • 0.8V Reference Allows Low Output Voltages
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Low Quiescent Current: 270µA (Each Controller)
  • Separate Shutdown Pin for Each Controller
  • Shutdown Mode Draws Only 8µA Supply Current (Each Controller)
  • ±2.5% Reference Accuracy
  • Available in 16-Lead Narrow SSOP
  • Each Controller Functions Independent of the Other

The LTC1874 is a dual constant frequency current mode step-down DC/DC controller with excellent AC and DC load and line regulation. Each controller has an accurate undervoltage lockout that shuts down the individual controller when the input voltage falls below 2.0V.

The LTC1874 boasts ±2.5% output voltage accuracy and consumes only 270µA of quiescent current per controller. The LTC1874 is configured with Burst Mode operation, which enhances efficiency at low output current for applications where efficiency is a prime consideration.

To further maximize the life of a battery source, each external P-channel MOSFET is turned on continuously in dropout (100% duty cycle). In shutdown, each controller draws a mere 8µA. High constant operating frequency of 550kHz allows the use of small external inductors.

The LTC1874 is available in a small footprint 16-lead narrow SSOP.

Applications

  • 1- or 2-Cell Lithium-Ion-Powered Applications
  • Distributed 3.3V, 2.5V or 1.8V Power Systems
  • Personal Information Appliances
  • Portable Computers
LTC1874
Dual Constant Frequency Current Mode Step-Down DC/DC Controller
Figure 1. LTC1874 3.5V-9.5V Input to 3.3V/1A and 1.8V/1A Dual Step-Down Converter Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

Data Sheet

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Software Resources

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Hardware Ecosystem

Parts Product Life Cycle Description
Power System Management (PSM) & Sequencers 1
LTC2974
RECOMMENDED FOR NEW DESIGNS 4-Channel PMBus Power System Manager Featuring Accurate Output Current Measurement
Switching Regulators & Controllers 1
LTC3880
RECOMMENDED FOR NEW DESIGNS Dual Output PolyPhase Step-Down DC/DC Controller with Digital Power System Management
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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC1874
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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.

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