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2022-09-24 23:33:15
LTC1986-3V/5V SIM card power supply adopts SOT-23
The LTC®1986 is a micropower charge pump DC/DC converter that supplies power to a 3V or 5V GSMSIM. It works in three modes: VOUT=5V (5V mode), VOUT=VIN (3V mode) or shutdown. Parts with an input voltage range of 2.6V to 4.4V can provide 10mA of output current. The LTC1986 allows a 2.6V drop at VIN, providing enhancements in 3V mode. In 3V mode, VOUT is connected directly to VIN through a 2.5W switch until VIN drops below 2.85V. When VIN is below 2.85V, the part is automatically boosted to VOUT to keep the 2.9V output regulated, thus ensuring that the output voltage remains within the 3V SIM card VCC specification. Extremely low operating current (14mA typical with no load) and low external component count make the part ideal for small, lightweight load battery powered applications. The total application circuit PCB area shown is less than 0.045 square inches. Protection features include inrush current limit, undervoltage lockout, short circuit, and thermal overload protection. The LTC1986 is available in a 6-pin SOT-23 package.