1. Products
  2. Power Management
  3. Inductorless (Charge Pump) DC/DC Converters
  4. Regulated Step-Down Charge Pumps
  5. LTC1911


Overview

Features and Benefits

  • Low Noise Constant Frequency Operation
  • 2.7V to 5.5V Input Voltage Range
  • No Inductors
  • Typical Efficiency 25% Higher Than LDOs
  • Shutdown Disconnects Load from VIN
  • Output Voltage: 1.8V ±4% or 1.5V ±4%
  • Output Current: 250mA
  • Low Operating Current: IIN = 180µA Typ
  • Low Shutdown Current: IIN = 10µA Typ
  • Oscillator Frequency: 1.5MHz
  • Soft-Start Limits Inrush Current at Turn On
  • Short-Circuit and Overtemperature Protected
  • Available in an 8-Pin MSOP Package

Product Details

The LTC1911 is a switched capacitor step-down DC/DC converter that produces a 1.5V or 1.8V regulated output from a 2.7V to 5.5V input. The part uses switched capacitor fractional conversion to achieve high efficiency over the entire input range. No inductors are required. Internal circuitry controls the step-down conversion ratio to optimize efficiency as the input voltage and load conditions vary. Typical efficiency is over 25% higher than that of a linear regulator.

A unique constant frequency architecture provides a low noise regulated output as well as lower input noise than conventional charge pump regulators. High frequency operation (fOSC = 1.5MHz) simplifies output filtering to further reduce conducted noise. To optimize efficiency,the part enters Burst Mode® operation under light load conditions.

Low operating current (180µA with no load, 10µA in shutdown) and low external parts count (two 1µF flying capacitors and two 10µF bypass capacitors) make the LTC1911 ideally suited for space constrained battery powered applications. The part is short-circuit and over temperature protected, and is available in an 8-pin MSOP package.

Applications

  • Handheld Computers
  • Cellular Phones
  • Smart Card Readers
  • Portable Electronic Equipment
  • Handheld Medical Instruments
  • Low Power DSP Supplies

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:

LTC1911-1.5
LTC1911-1.8

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.View our quality and reliability program and certifications for more information.

Part Number Material Declaration Reliability Data Pin/Package Drawing CAD Symbols, Footprints & 3D Models
LTC1911EMS8-1.5#PBF Material Declaration Reliability Data 8-Lead MSOP
LTC1911EMS8-1.5#TRPBF Material Declaration Reliability Data 8-Lead MSOP
LTC1911EMS8-1.8#PBF Material Declaration Reliability Data 8-Lead MSOP
LTC1911EMS8-1.8#TRPBF Material Declaration Reliability Data 8-Lead MSOP
Wafer Fabrication Data R415 Reliability Data

PCN-PDN Information

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Sample & Buy


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Buy Now Pricing


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List Pricing


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Lead Times


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Sampling


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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.