LTC4558 Dual SIM/Smart Card Power Supply and Interface FEATURES DESCRIPTION Power Management and Control for Two SIM Cards The LTC 4558 provides the power conversion and signal or Smart Cards level translation needed for advanced cellular telephones Independent 1.8V/3V V Control for Both Cards to interface with 1.8V or 3V subscriber identity modules CC Supports Simultaneous Powering of Both Cards (SIMs). The device meets all requirements for 1.8V and Fast Channel Switching 3V SIMs and contains LDO regulators to power 1.8V or 3V Automatic Level Translation SIM cards from a 2.7V to 5.5V input. The output voltages Dynamic Pull-Ups Deliver Fast Signal Rise Times* can be set using the two voltage selection pins and up to Built-In Fault Protection Circuitry 50mA of load current can be supplied. A channel select Automatic Activation/Deactivation Sequencing pin determines which channel is open for communication. Circuitry Separate enable pins for each channel allow both cards to Low Operating/Shutdown Current be powered at once and allow for faster transition from > 10kV ESD on SIM Card Pins one channel to the other. Meets EMV Fault Tolerance Requirements Internal level translators allow controllers operating with Low Pro le 20-Lead (3mm 3mm) QFN Package 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 65A and a shutdown current of less than 1A. APPLICATIONS Board area is minimized by the low pro le 3mm 3mm + GSM, TD-SCDMA and other 3G Cellular Phones 0.75mm leadless QFN package. Wireless Point-of-Sale Terminals , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Multiple SIM Card Interfaces All other trademarks are the property of their respective owners. *Protected by U.S. Patents, including 6356140. TYPICAL APPLICATION DV V CC BATT 1.4V TO 4.4V 3V TO 6V DV CC Deactivation Sequence 0.1F 0.1F DV V CC BATT C7 CLKIN I/OA I/O C2 RSTX RSTIN RSTA RST 1.8V/3V 5V/DIV C3 SIM DATA CLKA CLK CARD A C1 V V CLKX CLKRUNA CCA CC GND 5V/DIV CONTROLLER 1F CLKRUNB C5 GND I/OX ENABLEA 5V/DIV 1F C1 ENABLEB V V V CCX CCB CC C3 2V/DIV CSEL CLKB CLK 1.8V/3V 4558 TA02 C2 SIM C = 1F 10s/DIV VCCX VSELA RSTB RST CARD B C7 VSELB I/OB I/O GND LTC4558 C5 4558 TA01 4558fa 1LTC4558 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) TOP VIEW V , DV , DATA, RSTIN, CLKIN, CLKRUNA, BATT CC CLKRUNB, ENABLEA, ENABLEB, CSEL, VSELA, VSELB to GND .............................................0.3V to 6V 20 19 18 17 16 I/OA, CLKA, RSTA ........................ 0.3V to VCCA + 0.3V CLKRUNB V 1 15 CCB CLKRUNA I/OB, CLKB, RSTB ........................ 0.3V to VCCB + 0.3V DV 2 14 CC CSEL V 3 21 13 BATT I (Note 4) .......................................................80mA CCA,B VSELA V 4 12 CCA V Short-Circuit Duration ........................... Inde nite CCA,B ENABLEA CLKA 5 11 Operating Temperature Range (Note 3) ...40C to 85C 6 7 8 9 10 Storage Temperature Range ...................65C to 125C UD PACKAGE 20-LEAD (3mm 3mm) PLASTIC QFN T = 125C, = 68C/W, = 4.2C/W JMAX JA JC EXPOSED PAD (PIN 21) IS GND, MUST BE SOLDERED TO PCB ORDER PART NUMBER UD PART MARKING LTC4558EUD LCSH Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: