Overview

Features and Benefits

  • High Efficiency: Up to 94%
  • 250mA Output Current
  • Wide VIN Range: 2.5V to 9.8V
  • 550kHz Constant Frequency Operation
  • Burst Mode Operation at Light Load
  • Low Dropout: 100% Duty Cycle
  • 0.8V Reference Allows Low Output Voltages
  • ±2.5% Reference Accuracy
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Low Quiescent Current: 135µA
  • Shutdown Mode Draws Only 8µA Supply Current
  • Low Profile (1mm) ThinSOT Package

Product Details

The LTC1779 is a constant frequency current mode step-down DC/DC converter in a 6-lead ThinSOT package. The part operates with a 2.5V to 9.8V input and can provide up to 250mA of output current. Current mode control provides excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1779 when the input voltage falls below 2V.

The LTC1779 boasts a ±2.5% output voltage accuracy and consumes only 135µA of quiescent current. For applications where efficiency is a prime consideration, the LTC1779 is configured for Burst Mode operation, which enhances efficiency at low output current.

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

The LTC1779 is available in a low profile (1mm) ThinSOT package.

Applications

  • 1- or 2-Cell Lithium-Ion-Powered Applications
  • Cellular Telephones
  • Wireless Modems
  • Portable Computers
  • Distributed 3.3V, 2.5V or 1.8V Power Systems
  • Scanners

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

Evaluation Kits (1)

Tools & Simulations

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.

LTspice

Models for the following parts are available in LTspice:

LTC1779

Product Recommendations

LTC1779 Companion Parts

Recommended Related Parts

Design Resources

ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

Sample & Buy


The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. sales office or authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.

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