SC1628

HIGH-EFFICIENCY STEP-UP DC-DC CONVERTER

DESCRIPTION

The is a high performance step-up DC-DC converter, designed to drive an external power switch to generate programmable positive voltages. In the particularly suitable LCD contrast bias and flash memory programming power supply applications, typical full load efficiencies are 85% to 95%. The 4V to 24V input operation range allows the SC1628 to be powered directly by the battery pack in most battery powered applications for greater efficiency.

FEATURES

•  4V to 24V input voltage operation

•  Adjustable output voltage

•  Low quiescent current at 100µA

•  Pulse-skipping and pulse-frequency modulation maintain high efficiency max. 95%

•  90kHz to 250kHz oscillator frequency

•  Power-saving shutdown mode 8µA typical

•  Push-pull driver output

APPLICATIONS

•  Flash memory programming power supply

•  Positive LCD contrast bias for notebook and palmtop computers

•  Step-up DC-DC converter module

•  Telecom power supply