LTC1986
3V/5V SIM Power Supply
in ThinSOT U DESCRIPTIO FEATURES
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в– The LTCВ®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 …