LTC1522

PRODUCTION

Micropower, Regulated 5V Charge Pump DC/DC Converter

Data Sheet Product Selection Table
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Overview

  • 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

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
LTC1522
Micropower, Regulated 5V Charge Pump DC/DC Converter
Regulated 5V Output from a 2.7V to 5V Input Efficiency vs Output Current Product Package 1 Product Package 2
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Documentation

Data Sheet 1

Reliability Data 1

Spec Notice 1

Data Sheet

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Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

  • LTC1522
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