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LTC4558

Linear
Part Number LTC4558
Manufacturer Linear
Description Dual SIM/Smart Card Power Supply/Interface
Published Mar 31, 2016
Detailed Description LTC4558 Dual SIM/Smart Card Power Supply and Interface FEATURES ■ Power Management and Control for Two SIM Cards or Sma...
Datasheet PDF File LTC4558 PDF File

LTC4558
LTC4558

Overview
LTC4558 Dual SIM/Smart Card Power Supply and Interface FEATURES ■ Power Management and Control for Two SIM Cards or Smart Cards ■ Independent 1.
8V/3V VCC Control for Both Cards ■ Supports Simultaneous Powering of Both Cards ■ Fast Channel Switching ■ Automatic Level Translation ■ Dynamic Pull-Ups Deliver Fast Signal Rise Times* ■ Built-In Fault Protection Circuitry ■ Automatic Activation/Deactivation Sequencing Circuitry ■ Low Operating/Shutdown Current ■ > 10kV ESD on SIM Card Pins ■ Meets EMV Fault Tolerance Requirements ■ Low Profile 20-Lead (3mm × 3mm) QFN Package APPLICATIONS ■ GSM, TD-SCDMA and other 3G+ Cellular Phones ■ Wireless Point-of-Sale Terminals ■ Multiple SIM Card Interfaces DESCRIPTION The LTC®4558 provides the power conversion and signal level translation needed for advanced cellular telephones to interface with 1.
8V or 3V subscriber identity modules (SIMs).
The device meets all requirements for 1.
8V and 3V SIMs and contains LDO regulators to power 1.
8V or 3V SIM cards from a 2.
7V to 5.
5V input.
The output voltages can be set using the two voltage selection pins and up to 50mA of load current can be supplied.
A channel select pin determines which channel is open for communication.
Separate enable pins for each channel allow both cards to be powered at once and allow for faster transition from one channel to the other.
Internal level translators allow controllers operating with supplies as low as 1.
4V to interface with 1.
8V or 3V Smart Cards.
Battery life is maximized by a low operating current of 65μA and a shutdown current of less than 1μA.
Board area is minimized by the low profile 3mm × 3mm × 0.
75mm leadless QFN package.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners.
*Protected by U.
S.
Patents, including 6356140.
TYPICAL APPLICATION DVCC μCONTROLLER DVCC VBATT 1.
4V TO 4.
4V 3V TO 6V 0.
1μF DVCC CLKIN VBATT I/OA RSTIN RSTA DATA CLKA CLKRUNA ...


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