AIC1896

AIC1896 1.4MHz SOT23 Current-Mode Step-Up DC/DC Converter FEATURES Fixed Frequency 1.4MHz Current-Mode PWM Operation. Adjustable Output Voltage up to 30V. Guaranteed 13V/ 200mA Output with 5V Input. 2.5V to 10V Input Range. Maximum 0.1µA Shutdown Current. Programmable Soft-Start. Tiny Inductor and Capacitors are allowed. Space-Saving SOT-23-6 Package. APPLICATIONS White LED Backlight. OLED Driver. DESCRIPTION AIC1896 is a current-mode pulse-width modulation (PWM), step-up DC/DC Converter. The built-in high voltage N-channel MOSFET allows AIC1896 for step-up applications with up to 30V output voltage, as well as for Single Ended Primary Inductance Converter (SEPIC) and other low-side switching DC/DC converter. The high switching frequency (1.4MHz) allows the use of small external components. The Soft-Start function is programmable with an external capacitor, which sets the input current ramp rate. The AIC1896 is available in a space-saving SOT-23-6 package. TYPICAL APPLICATION CIRCUIT VIN 3.3V or 4.2V C1 4.7µF OFF ON L D1 CH521S-30 AIC1896 ZD1 BZV55-B12 11.8V~12.2V 6 IN LX 1 4 SHDN FB 3 SS GND 52 R2 1KΩ C2 0.033µF C3 1µF ILED R1 62 Efficiency (%) 86 84 82 80 78 VIN=4.2V 76 VIN=3.3V 74 72 L: GTSK-51-150M (15µH) 70 L: GTSK-51-100M (10µH) 68 2 4 6 8 10 12 14 16 18 LED Current (mA) Fig. 1 Li-Ion Powered Driver for three white LEDs 20 Analog Integrations Corporation Si-Soft Research Center 3A1, No.1, Li-Hsin Rd. I, Science Park, Hsinchu 300, Taiwan, R.O.C...