LTC1555/LTC1556 SIM Power Supply and Level Translator DESCRIPTION FEATURES n Step-Up/Step-Down Charge Pump Generates 5V The LTC 1555/LTC1556 provide power conversion and n Input Voltage Range: 2.7V to 10V level shifting needed for 3V GSM cellular telephones to n Output Current: 10mA (V 2.7V) interface with either 3V or 5V Subscriber Identity Mod- IN 20mA (V 3V) ules (SIMs). These parts contain a charge pump DC/DC IN n 3V to 5V Signal Level Translators converter that delivers a regulated 5V to the SIM card. n >10kV ESD on All SIM Contact Pins Input voltage may range from 2.7V to 10V, allowing n Short-Circuit and Overtemperature Protected direct connection to the battery. Output voltage may be n Very Low Operating Current: 60A programmed to 3V, 5V or direct connection to the V pin. IN n Very Low Shutdown Current: < 1A A soft start feature limits inrush current at turn-on, n Soft Start Limits Inrush Current at Turn-On mitigating start-up problems that may result when the n Programmable 3V or 5V Output Voltage input is supplied by another low power DC/DC converter. n 650kHz Switching Frequency The LTC1556 also includes an auxiliary LDO regulator/ n Auxiliary 4.3V LDO/Power Switch (LTC1556 Only) power switch that may be used to power the frequency n Available in a 16- and 20-Pin Narrow SSOP synthesizer or other low power circuitry. U Battery life is maximized by 60A operating current and APPLICATIONS 1A shutdown current. Board area is minimized by minia- ture 16- and 20-pin narrow SSOP packages and the need n SIM Interface in GSM Cellular Telephones for only three small external capacitors. n Smart Card Readers , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATION GSM Cellular Telephone SIM Interface 3V GSM V IN CONTROLLER 3V LTC1555 2.7V TO 10V SIM 1 16 CIN CLK CLK 2 15 RIN RST RST 3 14 DATA I/O I/O 4 13 DDRV V V CC CC 5 12 5V 5% V DV CC V CC IN I 10mA VCC 10F 6 11 + + SS C1 0.1F 10F 7 10 M1 C1 8 9 GND M0 GND 1555/56 TA01 1 U ULTC1555/LTC1556 ABSOLUTE MAXIMUM RATINGS (Note 1) V , DV to GND ..................................... 0.3V to 12V Temperature Range IN CC V to GND ............................................... 0.3V to 12V LTC1555C/LTC1556C .............................. 0C to 70C CC Digital Inputs to GND................................ 0.3V to 12V LTC1555I/LTC1556I ........................... 40C to 85C LDO, CLK, RST, I/O to GND ........ 0.3V to (V + 0.3V) Extended Commercial Operating Temperature Range CC V , LDO Short-Circuit Duration ..................... Indefinite (Note 2) ............................................. 40C to 85C CC Storage Temperature Range ................. 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C PACKAGE/ORDER INFORMATION TOP VIEW ORDER PART ORDER PART TOP VIEW NUMBER NUMBER CIN 1 20 CLK RIN 2 19 RST 1 CLK CIN 16 LTC1556CGN LTC1555CGN DATA 3 18 I/O 2 RST RIN 15 LTC1555IGN LTC1556IGN DDRV 4 17 LDO 3 I/O DATA 14 EN 5 16 V 4 V CC DDRV 13 CC FB 6 15 V 5 V IN DV 12 CC IN + + DV 7 14 C1 6 C1 CC SS 11 SS 8 13 C1 7 C1 M1 10 M1 9 12 GND 8 GND M0 9 M0 10 11 GND GN PACKAGE 16-LEAD PLASTIC SSOP GN PACKAGE T = 150C, = 135C/ W 20-LEAD PLASTIC SSOP JMAX JA T = 150C, = 95C/ W JMAX JA Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS V = 2.7V to 10V, DV = 1.8V to 5.5V, controller digital pins tied to DV , SIM digital pins floating, EN, FB pins tied to GND IN CC CC (LTC1556), C1 = 0.1F, C = 10F unless otherwise specified. OUT PARAMETER CONDITIONS MIN TYP MAX UNITS V Operating Voltage l 2.7 10 V IN DV Operating Voltage l 1.8 5.5 V CC V Operating Current 2.7V V 5V, V = 5V, I = 0 l 60 100 A IN IN CC VCC 5V < V 10V, V = 5V, I = 0 l 75 135 A IN CC VCC V Shutdown Current M0, M1 = 0V, 2.7V V 5V 1 A IN IN M0, M1 = 0V, 2.7V V 5V l 2 A IN M0, M1 = 0V, 5V < V 10V 25 A IN DV Operating Current M0, M1 = DV , C = 1MHz l 620 A CC CC IN DV Shutdown Current M0, M1 = 0V l 1 A CC V Output Voltage 0 I 10mA, 2.7V V 10V CC VCC IN 0 I 20mA, 3V V 10V VCC IN M0, M1 = DV l 4.75 5.00 5.25 V CC M0 = DV , M1 = 0 l 2.80 3.00 3.20 V CC M0 = 0, M1 = DV l V 0.3 V V CC IN IN V Output Ripple V = 3.6V, I = 10mA, V = 5V 75 mV CC IN VCC CC P-P 2 U W U W U WW