LTC1555L SIM Power Supply and Level Translator FEATURES DESCRIPTIO n Buck/Boost Charge Pump Generates 3V or 5V The LTC 1555L provides power conversion and level n Input Voltage Range: 2.6V to 6V shifting needed for low voltage GSM cellular telephones to n Controller V Range: 1.425V to 4.4V interface with either 3V or 5V Subscriber Identity Modules CC n >10kV ESD on All SIM Contact Pins (SIMs). The part contains a patented buck/boost charge n Short-Circuit and Overtemperature Protected pump DC/DC converter* that delivers a regulated V CC n 3V to 5V Signal Level Translators supply voltage to the SIM card. Input voltage may range n Very Low Operating Current: 40m A from 2.6V to 6V allowing direct connection to the battery. n Very Low Shutdown Current: <1m A The output voltage may be programmed to 3V, 5V or direct n Soft-Start Limits Inrush Current at Turn-On connection to the V pin. IN n 1MHz Switching Frequency Internal level translators allow controllers operating with n Available in 16-Pin Narrow SSOP Package supplies as low as 1.425V to interface with 3V and 5V SIMs. A soft-start feature limits inrush current at turn-on, U mitigating start-up problems that may result when the APPLICATIO S input is supplied by another low-power DC/DC converter. n SIM Interface in GSM Cellular Telephones Battery life is maximized by 40m A operating current, and n Smart Card Readers 1m A shutdown current. Board area is minimized by the miniature 16-pin narrow SSOP packages and the need for only three small external capacitors. , LTC and LT are registered trademarks of Linear Technology Corporation. *U.S. Patent No.: 5,973,944 TYPICAL APPLICATIO GSM Cellular Telephone SIM Interface GSM V IN CONTROLLER 1.425V TO 4.4V LTC1555L 2.6V TO 6V SIM 1 16 CIN CLK CLK 2 15 RIN RST RST OUTPUT VOLTAGE 3 14 MODES DATA I/O I/O 4 13 V = 3V CC DDRV V V CC CC V = 5V CC 5 12 I = 10mA VCC V DV V * CC CC IN V = V CC IN 2.2m F 6 11 + N/C C1 * ACTUAL V WILL CC 0.1m F 7 10 DEPEND ON OUTPUT M1 C1 1m F GND CURRENT IN THIS MODE 8 9 M0 GND 1555L TA01 1 U ULTC1555L UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) ORDER PART V , DV to GND ..................................... 0.3V to 6.5V TOP VIEW IN CC NUMBER V to GND ...............................................0.3V to 6.5V CC CIN 1 16 CLK Digital Inputs to GND ................................0.3V to 6.5V RIN 2 15 RST LTC1555LEGN CLK, RST, I/O to GND ..................... 0.3V to V + 0.3V DATA 3 14 I/0 CC V Short-Circuit Duration............................... Indefinite DDRV 4 13 V CC CC 5 Operating Temperature Range (Note 2) .. 40 C to 85 C DV 12 V CC IN + 6 N/C 11 C1 Storage Temperature Range ................. 65 C to 150 C GN PART MARKING 7 10 M1 C1 Lead Temperature (Soldering,10 sec)................... 300 C 8 9 M0 GND 1555L GN PACKAGE 16-LEAD PLASTIC SSOP T = 125 C, q = 150 C/W JMAX JA Consult factory for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at T = 25 C. (V = 2.6V to 6V, DV = 1.425V to 4.4V, controller digital pins tied to A IN CC DV , SIM digital pins floating, C1 = 0.1m F, C = 2.2m F unless otherwise noted) CC OUT PARAMETER CONDITIONS MIN TYP MAX UNITS V Operating Voltage l 2.6 6 V IN DV Operating Voltage l 1.425 4.4 V CC DV Undervoltage Lockout 1.2 V CC V Operating Current V = 5V, I = 0V l 35 65 m A IN CC VCC V Shutdown Current M0, M1 = 0V l 1 m A IN DV Operating Current M0, M1, DATA = DV , C = 1MHz l 530 m A CC CC IN DV Shutdown Current M0, M1 = 0V, DATA, C = DV l 1 m A CC IN CC V Output Voltage 0 < I < 10mA CC VCC M0, M1 = DV , 2.6V < V < 6V l 4.55 5 5.25 V CC IN M0, M1 = DV , 2.7V < V < 6V l 4.75 5 5.25 V CC IN M0 = DV , M1 = 0 l 2.8 3 3.2 V CC M0 = 0, M1 = DV l V 0.2 V V CC IN IN V Short-Circuit Current V Shorted to GND l 50 150 mA CC CC Charge Pump f 1 MHz OSC 2 U WWW