Interface SIM Interface
Power Management Inductorless (Charge Pump) DC/DC Converters Regulated Step-Up Charge Pumps
 Power Management Inductorless (Charge Pump) DC/DC Converters Regulated Buck-Boost Charge Pumps

LTC1555L - SIM Power Supply and Level Translator

Features

  • Buck/Boost Charge Pump Generates 3V or 5V
  • Input Voltage Range: 2.6V to 6V
  • Controller VCC Range: 1.425V to 4.4V
  • >10kV ESD on All SIM Contact Pins
  • Short-Circuit and Overtemperature Protected
  • 3V to 5V Signal Level Translators
  • Very Low Operating Current: 40µA
  • Very Low Shutdown Current: <1µA
  • Soft-Start Limits Inrush Current at Turn-On
  • 1MHz Switching Frequency
  • Available in 16-Pin Narrow SSOP Package

Typical Application

LTC1555L Typical Application

Description

The LTC1555L provides power conversion and level shifting needed for low voltage GSM cellular telephones to interface with either 3V or 5V Subscriber Identity Modules (SIMs). The part contains a patented buck/boost charge pump DC/DC converter* that delivers a regulated VCC supply voltage to the SIM card. Input voltage may range from 2.6V to 6V allowing direct connection to the battery. The output voltage may be programmed to 3V,5V or direct connection to the VIN pin.

Internal level translators allow controllers operating with supplies as low as 1.425V to interface with 3V and 5V SIMs. 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. Battery life is maximized by 40µA operating current, and 1µA shutdown current. Board area is minimized by the miniature 16-pin narrow SSOP packages and the need for only three small external capacitors.

Packaging

CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
Drawing		 RoHS
LTC1555LEGN#PBF SSOP-16 GN E 05-08-1641 (GN16) Yes
LTC1555LEGN#TRPBF SSOP-16 GN E 05-08-1641 (GN16) Yes


LTC1555L Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
(1-99)		 Price
(1k)*		 RoHS
LTC1555LEGN#PBF SSOP-16 E $2.37 $2.00 Yes
LTC1555LEGN#TRPBF SSOP-16 E $2.06 Yes
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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 Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Click here to view our complete list of demo boards

Applications

  • SIM Interface in GSM Cellular Telephones
  • Smart Card Readers

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