LTC1555L-1.8 SIM Power Supply and Level Translator FEATURES DESCRIPTIO n Buck/Boost Charge Pump Generates 1.8V, 3V or 5V The LTC 1555L-1.8 provides power conversion and level n Input Voltage Range: 2.6V to 6V shifting needed for low voltage GSM and WCDMA cellular n Controller V Range: 1.425V to 4.4V telephones to interface with either 1.8V, 3V or 5V sub- CC n >10kV ESD on All SIM Contact Pins scriber identity modules (SIMs). The part contains a n Short-Circuit and Overtemperature Protected patented buck/boost charge pump DC/DC converter* that n Meets all ETSI and IMT-2000 SIM Interface delivers a regulated V supply voltage to the SIM card. CC Requirements Input voltage may range from 2.6V to 6V allowing direct n 1.8V to 5V Signal Level Translators connection to the battery. The output voltage may be n Very Low Operating Current: 32m A programmed to 1.8V, 3V, 5V or direct connection to the n Very Low Shutdown Current: <1m A V pin. IN n Soft-Start Limits Inrush Current at Turn-On Internal level translators allow controllers operating with n 1MHz Switching Frequency supplies as low as 1.425V to interface with 1.8V, 3V and n Available in 16-Pin Narrow SSOP Package 5V SIMs. A soft-start feature limits inrush current at turn- on, mitigating start-up problems that may result when the U input is supplied by another low-power DC/DC converter. APPLICATIO S Battery life is maximized by 32m A operating current, and n SIM Interface in GSM Cellular Telephones 1m A shutdown current. Board area is minimized by the n WCDMA SIM Interface miniature 16-pin narrow SSOP packages and the need for n Smart Card Readers 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 1.425V TO 4.4V CONTROLLER LTC1555L-1.8 2.6V TO 6V SIM 1 16 CIN CLK CLK 2 15 RIN RST RST 3 14 DATA I/O I/O 4 13 DDRV V V = 1.8V,3V,5V CC CC 5 12 I = 10mA VCC V CC DV V CC IN 6 11 2.2m F + M2 C1 0.1m F 7 10 M1 C1 1m F GND 8 9 M0 GND 1555L TA01 1 U ULTC1555L-1.8 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-1.8 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 DV 12 V Operating Temperature Range (Note 2) .. 40 C to 85 C CC IN + 6 11 M2 C1 Storage Temperature Range ................. 65 C to 150 C 7 10 M1 C1 GN PART MARKING Lead Temperature (Soldering,10 sec)................... 300 C 8 9 M0 GND 555L18 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 = 3V, I = 0V l 27 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 M0 = DV , M1 = 0, M2 = DV , 0 I 6mA l 1.71 1.8 1.89 V CC CC VCC M0 = DV , M1 = 0, M2 = DV , V 3V, I 10mA l 1.71 1.8 1.89 V CC CC IN VCC V Short-Circuit Current V Shorted to GND l 50 150 mA CC CC Charge Pump f 1 MHz OSC 2 U WWW