DESCRIPTION
The LTC®1516 is a micropower charge pump DC/DC converter that produces a regulated 5V output from a 2V to 5V supply. Extremely low supply current (12µA typical with no load, < 1µA in shutdown) and low external parts count (two 0.22µF flying capacitors and two 10µF capacitors at VIN and VOUT) make the LTC1516 ideally suited for small, light load battery-powered applications. Typical efficiency (VIN = 3V) exceeds 70% with load currents between 50µA and 50mA. Modulating the SHDN pin keeps the typical efficiency above 70% with load currents all the way down to 10µA.

FEATURES
■ Ultralow Power: Typical Operating ICC = 12µA
■ Short Circuit/Thermal Protection
■ Regulated 5V ±4% Output
■ 2V to 5V Input Range
■ No Inductors
■ ICC in Shutdown: <1µA
■ Output Current:20mA (VIN > 2V)
                            50mA (VIN > 3V)
■ Shutdown Disconnects Load from VIN
■ Internal Oscillator: 600kHz
■ Compact Application Circuit (0.1 in2)
■ 8-Pin SO Package

APPLICATIONS
■ 2-Cell to 5V Conversion
■ Li-Ion Battery Backup Supplies
■ Local 3V to 5V Conversion
■ 5V Flash Memory Programmer
■ Smart Card Readers