Overview

Features and Benefits

  • Very Low Standby Current: 10µA
  • Available in Space-Saving 8-Lead MSOP Package
  • Output Currents: Up to 5A
  • Wide VIN Range: 2.8V to 20V Operation
  • VOUT Range: 1.23V to 18V
  • High Efficiency: Over 93% Possible
  • ±2% Output Accuracy
  • Very Low Dropout Operation: 100% Duty Cycle
  • Current Mode Operation for Excellent Line and Load Transient Response
  • Defeatable Burst Mode Operation
  • Short-Circuit Protected
  • Optional Programmable Soft-Start
  • Micropower Shutdown: IQ = 2µA

Product Details

The LTC1771 is a high efficiency current mode step-down DC/DC controller that draws as little as 10µA DC supply current to regulate the output at no load while maintaining high efficiency for loads up to several amps.

The LTC1771 drives an external P-channel power MOSFET using a current mode, constant off-time architecture. An external sense resistor is used to program the operating current level. Current mode control provides short-circuit protection, excellent transient response and controlled start-up behavior. Burst Mode operation enables the LTC1771 to maintain high efficiency down to extremely low currents. Shutdown mode further reduces the supply current to a mere 2µA. For low noise applications, Burst Mode operation can be easily disabled with the MODE pin.

Wide input supply range of 2.8V to 18V (20V maximum) and 100% duty cycle operation for low dropout make the LTC1771 ideal for a wide variety of battery-powered applications where maximizing battery life is important.

The LTC1771’s availability in both 8-lead MSOP and SO packages provides for a minimum area solution.

Applications

  • Cellular Telephones and Wireless Modems
  • 1- to 4-Cell Lithium-Ion-Powered Applications
  • Portable Instruments
  • Battery-Powered Equipment
  • Battery Chargers
  • 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.

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:

LTC1771

Product Recommendations

LTC1771 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.


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