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LTC1986 Datasheet(PDF) 1 Page - Linear Technology |
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LTC1986 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 8 page  1 LTC1986 1986fa s VIN Range: 2.6V to 4.4V s Ultralow Power Operating Current: 14 µA Shutdown Current: <1 µA s No Inductors s Short-Circuit/Thermal Protected s Ultrasmall Application Circuit (< 0.045in2) s Low Profile (1mm) ThinSOT TM s Step-Up Charge Pump Generates 5V s Output Current: 10mA s VIN to VOUT Direct Connection for 3V SIMs s Switching Frequency: 900kHz s Soft-Start Limits Inrush Current at Turn-On s Output Driven to Ground During Shutdown The LTC ®1986 is a micropower charge pump DC/DC converter that provides power for either 3V or 5V GSM SIM cards. It operates in one of three modes: VOUT = 5V (5V mode), VOUT = VIN (3V mode) or shutdown. The input voltage range is 2.6V to 4.4V and the part can provide 10mA of output current. The LTC1986 allows VIN to drop as low as 2.6V by providing a boost feature in 3V mode. In 3V mode, VOUT is connected directly to VIN through a 2.5Ω switch until VIN drops below 2.85V. When VIN is below 2.85V, the part automatically boosts VOUT to maintain a regulated 2.9V output, thereby ensuring VOUT stays within the 3V SIM VCC specification. Extremely low operating current (14 µA typical with no load) and low external parts count make the part ideally suited for small, light load battery-powered applications. The total PCB area of the application circuit shown below is less than 0.045in2. Protection features include inrush current limiting, undervoltage lockout, short circuit and thermal overload protection. The LTC1986 is available in a low profile (1mm) SOT-23 package. s GSM Cellular Telephones s PCS/DCS Cellular Telephones s Portable POS Terminals 3V/5V SIM Power Supply in ThinSOT , LTC and LT are registered trademarks of Linear Technology Corporation. VOUT GND MODE VIN C1+ C1– 1 2 3 6 5 4 VOUT = 5V OR VIN GSM CONTROLLER 2.2 µF 0.047 µF 0.1 µF VIN = 2.6V TO 4.4V LTC1986 750k 1M 3/5 SHDN 1986 TA01 SHDN 0 0 1 1 3/5 0 1 0 1 MODE SHUTDOWN SHUTDOWN VOUT = 5V VOUT = VIN 3V/5V SIM Power Supply INPUT VOLTAGE (V) 2.5 4 5 4.5 1986 TA02 3 2 3.0 3.5 4.0 6 TA = 25°C IOUT = 10mA 5V MODE 3V MODE (VOUT = VIN) Output Voltage vs Input Voltage APPLICATIO S FEATURES TYPICAL APPLICATIO DESCRIPTIO ThinSOT is a trademark of Linear Technology Corporation. |
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