DESCRIPTION
The SP6681 is a charge pump ideal for converting a +3.6V Li-Ion battery input to a +5.0V regulated output. An input voltage range of +2.7V to +5.5V is converted to a regulated output of 5.0V. The SP6681 device will operate at three different switching frequencies corresponding to three different output resistances and load current ranges. An external 32.768kHz nominal clock signal is used to produce three synchronized pump frequencies through the use an internal phase lock loop to drive the charge pump.

FEATURES
■ Ideal for Li Ion or 3V to 5V Conversion
■ Low Profile, Inductorless Regulator
■ Up To 96% Power Efficiency
■ +2.7V to +5.5V Input Voltage Range
■ 5.0V, 50mA Output, 4% Accuracy
■ Low EMI Design
■ Low Quiescent Current: 175µA
■ Low Shutdown Current: 4µA
■ Optional External Clock: 32.768kHz
■ Thermal Shutdown Protection
■ Programmable Frequencies: 8.192kHz, 32.768kHz, or 262.14kHz
■ Internal Oscillator: 16kHz or 130kHz, when CLK Pin Is Held High
■ Ultra small 10-Pin MSOP Package

APPLICATIONS
■ GSM SIM Card Power Supplies
■ 3V to 5V Boost Applications
■ Li Ion to 5.0V Boost Applications
■ White LED Driver
■ Smart Card Readers