DESCRIPTION
The LTC®1751 family are micropower charge pump DC/DC converters that produce a regulated output voltage at up to 100mA. The input voltage range is 2V to 5.5V. Extremely low operating current (20µA typical with no load) and low external parts count (one flying capacitor and two small bypass capacitors at VIN and VOUT) make them ideally suited for small, battery-powered applications.

FEATURES
■ 5V Output Current: 100mA (VIN ≥ 3V)
■ 3.3V Output Current: 80mA (VIN ≥ 2.5V)
■ Ultralow Power: 20µA Quiescent Current
■ Regulated Output Voltage: 3.3V ±4%, 5V ±4%, ADJ
■ No Inductors
■ Short-Circuit/Thermal Protection
■ VIN Range: 2V to 5.5V
■ 800kHz Switching Frequency
■ Very Low Shutdown Current: <2µA
■ Shutdown Disconnects Load from VIN
■ PowerGood/Undervoltage Output
■ Adjustable Soft-Start Time
■ Available in an 8-Pin MSOP Package

APPLICATIONS
■ Li-Ion Battery Backup Supplies
■ Local 3V and 5V Conversion
■ Smart Card Readers
■ PCMCIA Local 5V Supplies
■ White LED Backlighting