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LTC1556C Datasheet(PDF) 1 Page - Linear Technology |
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LTC1556C Datasheet(HTML) 1 Page - Linear Technology |
1 / 12 page 1 LTC1555/LTC1556 SIM Power Supply and Level Translator FEATURES s Step-Up/Step-Down Charge Pump Generates 5V s Input Voltage Range: 2.7V to 10V s Output Current: 10mA (VIN ≥ 2.7V) 20mA (VIN ≥ 3V) s 3V to 5V Signal Level Translators s > 10kV ESD on All SIM Contact Pins s Short-Circuit and Overtemperature Protected s Very Low Operating Current: 60 µA s Very Low Shutdown Current: < 1 µA s Soft Start Limits Inrush Current at Turn-On s Programmable 3V or 5V Output Voltage s 650kHz Switching Frequency s Auxiliary 4.3V LDO/Power Switch (LTC1556 Only) s Available in a 16- and 20-Pin Narrow SSOP DESCRIPTION The LTC ®1555/LTC1556 provide power conversion and level shifting needed for 3V GSM cellular telephones to interface with either 3V or 5V Subscriber Identity Mod- ules (SIMs). These parts contain a charge pump DC/DC converter that delivers a regulated 5V to the SIM card. Input voltage may range from 2.7V to 10V, allowing direct connection to the battery. Output voltage may be programmed to 3V, 5V or direct connection to the VIN pin. A soft start feature limits inrush current at turn-on, mitigating start-up problems that may result when the input is supplied by another low power DC/DC converter. The LTC1556 also includes an auxiliary LDO regulator/ power switch that may be used to power the frequency synthesizer or other low power circuitry. Battery life is maximized by 60 µA operating current and 1 µA shutdown current. Board area is minimized by minia- ture 16- and 20-pin narrow SSOP packages and the need for only three small external capacitors. TYPICAL APPLICATION GSM Cellular Telephone SIM Interface 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 CIN RIN DATA DDRV DVCC SS M1 M0 CLK RST I/O VCC 5V ±5% IVCC ≤ 10mA GND CLK RST I/O VCC VIN C1+ C1– GND 0.1 µF 10 µF LTC1555 3V GSM CONTROLLER SIM VIN 2.7V TO 10V 3V 10 µF 1555/56 TA01 VCC + , LTC and LT are registered trademarks of Linear Technology Corporation. s SIM Interface in GSM Cellular Telephones s Smart Card Readers APPLICATIONS |
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