LTC1556 - SIM Power Supplyand Level Translator

A soft start feature limits inrush current at turn-on, mitigating start-up problems that may result when the input is supplied by another low power DC/DC converter. The LTC1556 also includes an auxiliary LDO regulator/power switch that may be used to power the frequency synthesizer or other low power circuitry.

Battery life is maximized by 60µA operating current and 1µA shutdown current. Board area is minimized by miniature 16- and 20-pin narrow SSOP packages and the need for only three small external capacitors.

  • Step-Up/Step-Down Charge Pump Generates 5V
  • Input Voltage Range: 2.7V to 10V
  • Output Current: 10mA (VIN >/= 2.7V) 20mA (VIN >/=3V)
  • 3V to 5V Signal Level Translators
  • >10kV ESD on All SIM Contact Pins
  • Short-Circuit and Overtemperature Protected
  • Very Low Operating Current: 60µA
  • Very Low Shutdown Current: <1µA
  • Soft Start Limits Inrush Current at Turn-On
  • Programmable 3V or 5V Output Voltage
  • 650kHz Switching Frequency
  • Auxiliary 4.3V LDO/Power Switch (LTC1556 Only)
  • Available in a 16- and 20-Pin Narrow SSOP
Typical Application
LTC1556 Typical Application
  • SIM Interface in GSM Cellular Telephones
  • Smart Card Readers
LTC1556 Package Drawing
LTC1556 Package Drawing
Order Information
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Reliability Data
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Related Products
LTC1555/LTC1556 - SIM Power Supply and Level Translator
R369 Reliability Data
LTC1556 Footprints and Symbols