AIC1640 ADVANCE INFORMATION LOW VOLTAGE STEP-UP DC/DC CONVERTER SPEC NO: DS-1640-P1 ■ FEATURES ■ DESCRIPTION Guaranteed Start-Up from Below 0.9 V. High Efficiency. Low Quiescent Current. Fixed or adjustable Output Voltage. Logic Controlled Shutdown. External Switch Driver available. The AIC1640 is a high efficiency step-up DC/DC converter for applications using 1 to 4 battery cells. Only three external components are required to deliver a fixed output voltage of 3V, 3.3V, or 5V. Pulse Frequency Modulation scheme brings optimized performance for applications with light output loading and low input voltage. The output ripple ■ APPLICATIONS and noise are lower compared with the circuit operating in PSM mode. The AIC1640 starts up from Pagers. Cameras. Wireless Microphones. Pocket Organizers. Battery Backup Suppliers. Portable Instruments. below 0.9V input to boost either 3V, 3.3V, or 5V output with 1mA load. Some useful features include external driver for higher power level applications, shutdown mode for saving the life of battery, and adjustable output version. The PFM control circuit operates in 100KHz (max.) switching rate, resulting in smaller passive component size, which makes the AIC1640 an ideal choice of DC/DC converter for space conscious applications. ■ TYPICAL APPLICATION CIRCUIT C1 22µF + D1 SB02-03C VIN ≧0.9V L1 88µH + VOUT 3.3V VDD CE EXT NC SW NC NC GND C2 100µF L1 VIN VOUT 3.3V/100mA D1 1N5819 C1 33µH ≧0.9V Q1 2SD2150 AIC1640 3.3V Output Step-Up DC/DC Converter 10nF VDD CE EXT NC SW NC NC GND AIC1640 R1 300 3.3V/100mA Step-Up DC/DC Converter ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 1 AIC1640 LOW VOLTAGE STEP-UP DC/DC CONVERTER SPEC NO: DS-1640-P1 ■ ORDERING INFORMATION AIC1640-XXXX ORDER NUMBER PACKAGE TYPE N: PLASTIC DIP S: SMALL OUTLINE TEMPERATURE RANGE C=0°C～+70°C OUTPUT VOLTAGE DEFAULT: ADJUSTABLE 30: 3.0V 33: 3.3V 50: 5.0V AIC1640-XXCN (PLASTIC DIP) AIC1640-XXCS (PLASTIC SO) PIN CONFIGURATION TOP VIEW VDD 1 8 CE EXT 2 7 NC SW 3 6 NC *NC/FB 4 5 GND *Fixed Output Voltage: NC Adjustable Output Voltage:FB ANALOG INTEGRATIONS CORPORATION www.analog.com.tw 4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C. TEL: (8863)577-2500 FAX:(8863)577-2510 2