AIC1628

AIC1628 3-Cell, High-Efficiency, Step-Up DC/DC Converter 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. DESCRIPTION The AIC1628 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%. 4V to 24V input operation range allows the AIC1628 to be powered directly by the battery pack in the most batteryoperated applications for greater efficiency. Output voltage can be scaled to 40V or greater by two external resistors. A Pulse-Frequency Modulation scheme is employed to maintain high efficiency conversion under wide input voltage range. Quiescent current is about 100µA and can be reduced to 8µA in shutdown mode. Switching frequency being around 90KHz to 250KHz range, small size switching components are ideal for battery powered portable equipments, like notebook and palmtop computers. APPLICATIONS Flash Memory Programming Power Supply. Positive LCD Contrast Bias for Notebook & Palmtop Computers. Step-Up DC/DC Converter Module. Telecom Power Supply. TYPICAL APPLICATION CIRCUIT +5V ~ 24V VIN *Fuse 60mΩ VIN 0.047 µF C2...