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LTC4558 Datasheet(PDF) 1 Page - Linear Technology |
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LTC4558 Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page LTC4558 1 4558fa TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION Dual SIM/Smart Card Power Supply and Interface 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 cur- rent 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. Deactivation Sequence ■ 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 ■ GSM, TD-SCDMA and other 3G+ Cellular Phones ■ Wireless Point-of-Sale Terminals ■ Multiple SIM Card Interfaces , 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. DVCC VBATT VBATT 3V TO 6V DVCC 1.4V TO 4.4V LTC4558 μCONTROLLER VCCA I/OA DVCC RSTA CLKA C1 C1 C5 C5 C3 C2 C7 C7 C2 C3 GND VCCB CLKB RSTB I/OB CLKIN 0.1 μF 1 μF 1 μF RSTIN DATA CSEL VSELA VSELB ENABLEA ENABLEB CLKRUNA CLKRUNB 0.1 μF 4558 TA01 1.8V/3V SIM CARD A 1.8V/3V SIM CARD B VCC I/O RST CLK GND GND VCC CLK RST I/O RSTX 5V/DIV CLKX 5V/DIV I/OX 5V/DIV VCCX 2V/DIV 10 μs/DIV CVCCX = 1μF 4558 TA02 |
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