SP6644 Datasheet | Sipex

DESCRIPTION The SP6644/6645 devices are high-efficiency, low-power step-up DC-DC converters ideal for single or dual alkaline cell applications such as pagers, remote controls, pointing devices, medical monitors, and other low-power portable end products. Designers can control the SP6644 device with an active LOW shutdown input. The SP6644 device features an active low output for batteries below +1.0V. The SP6645 device features an active low output for batteries below +2.0V. Both devices contain a 0.8Ω synchronous rectifier, a 0.5Ω N-channel MOSFET power switch, an internal voltage reference, circuitry for pulsefrequency-modulation, and an under voltage parator. The output voltage for the SP6644/6645 devices is preset to +3.3V + 4% or can be adjusted from +2V to +5.5V by manipulating two external resistors TYPICAL APPLICATION CIRCUIT 0.88V to 3.3V Input 47µF 22µH 0.7A VBATT RLIM VOUT SP6644 SP6645 SHDN 47µF +3.3VOUT BATTLO Date: 11/30/04 SP6644/6645 High Efficiency Boost Regulator © Copyright 2004 Sipex Corporation These are stress ratings only and functional operation of the device at these ratings or any other above those indicated in the operation sections of the specifications below is not implied. Exposure to absolute maximum rating conditions for extended periods of time may affect reliability. VBATT to GND -0.3 to 6.0V VOUT to GND -0.3 to 6.0V LX, SHDN, FB, BATTLO, to GND -0.3 to 6.0V Reverse battery Current, TAMB=+25˚C 220m A (NOTE 1) VBATT forward current 0.5A VOUT, LX current 1A Storage Temperature Range -65˚C to +165˚C Lead Temperature (soldering 10s) +300˚C Operating Temperature -40˚C to +85˚C Power Dissipation Per Package 8-pin µSOIC (derate 4.85m W/OC above +70OC)...