AIC1628 Datasheet | Analog Intergrations Corporation

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 ponents are ideal for battery powered portable equipments, like notebook and palmtop puters. APPLICATIONS Flash Memory Programming Power Supply. Positive LCD Contrast Bias for Notebook & Palmtop puters. Step-Up DC/DC Converter Module. Tele Power Supply. TYPICAL APPLICATION CIRCUIT +5V ~ 24V VIN - Fuse 60mΩ VIN 0.047 µF C2 VREF SHDN FB CL DHI DLOW GND AIC1628 R2 16.5K 0.033 µF C3 R1 470K 0.01 µF C4 - Buss Fuse MCR-2A - - Sumida CDR105 - - L1 68µH 1N5819 D1 Q1 2SK940 C5 220µF +36V VOUT + C1 120µF VIN=13V Efficiency (%) VIN=9V VIN=18V VIN=5V 5V + C6 0.1µF >50m A VOUT=36V 80 0 50 100 150 200 Load Current (m A) Color LCD Contrast Bias Supply Efficiency vs. Output Current Analog Integrations Corporation DS-1628-00 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC TEL: 886-3-5772500 FAX: 886-3-5772510 .analog..tw ORDERING...