Overview

Features and Benefits

  • Ultralow Power: Typical Operating ICC = 6µA
  • Short-Circuit/Thermal Protected
  • Regulated 5V ±4% Output Voltage
  • 2.7V to 5V Input Range
  • No Inductors
  • Very Low ICC in Shutdown: <1µA
  • Output Current:
    • 10mA (VIN ≥ 2.7V)
    • 20mA (VIN ≥ 3V)
  • Shutdown Disconnects Load from VIN
  • Internal Oscillator: 700kHz
  • Compact Application Circuit (<0.1 in2)
  • 8-Pin MSOP and SO Packages

Product Details

The LTC1522 is a micropower charge pump DC/DC converter that produces a regulated 5V output from a 2.7V to 5V input supply. Extremely low supply current (6µA typical with no load, <1µA in shutdown) and low external parts count (one 0.22µF flying capacitor and two 10µF capacitors at VIN and VOUT) make the LTC1522 ideally suited for small, light load battery-powered applications. Typical efficiency (VIN = 3V) exceeds 75% with load currents between 50µA and 20mA. Modulating the SHDN pin keeps the typical efficiency above 75% with load currents all the way down to 10µA.

The LTC1522 has thermal shutdown and can survive a continuous short from VOUT to GND. In shutdown the load is disconnected from VIN. The part is available in 8-pin MSOP and SO packages. The LTC1522 is pin compatible with the LTC1516 in applications where VIN ≥ 2.7V and IOUT ≤ 20mA.

Applications

  • SIM Interface Supplies for GSM Cellular Telephones
  • Li-Ion Battery Backup Supplies
  • Local 3V to 5V Conversion
  • Smart Card Readers
  • PCMCIA Local 5V 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.

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:

LTC1522

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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