Overview

Features and Benefits

  • 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
  • Tiny 6-Lead SOT-23 Package
  • 0.8V Reference Allows Low Output Voltages
  • Current Mode Operation for Excellent Line and Load
  • Transient Response
  • Low Quiescent Current: 270µA
  • Shutdown Mode Draws Only 8µA Supply Current
  • ±2.5% Reference Accuracy

Product Details

The LTC1772 is a constant frequency current mode step-down DC/DC controller providing excellent AC and DC load and line regulation. The device incorporates an accurate undervoltage lockout feature that shuts down the LTC1772 when the input voltage falls below 2.0V.

The LTC1772 provides a ±2.5% output voltage accuracy and consumes only 270µA of quiescent current. For applications where efficiency is a prime consideration, the LTC1772 is configured for Burst Mode operation, which enhances efficiency at low output current.

To further maximize the life of a battery source, the external 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 LTC1772 is available in a small footprint 6-lead SOT-23.

Burst Mode
LTC1772 Yes
LTC1772B No

Applications

  • One or Two 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 (2)

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:

LTC1772
LTC1772B

Product Recommendations

LTC1772 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.

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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.


Price Table Help

 
Evaluation Boards Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.