SP6643 Datasheet | Sipex

DESCRIPTION The SP6642/6643 devices are high-efficiency, low-power step-up DC-DC converters for +1V inputs ideal for single alkaline cell applications such as pagers, remote controls, and other low-power portable end products. Designers can control the SP6642 device with a 1n A active LOW shutdown input. The SP6643 features an active LOW output for low-battery conditions. Both devices contain a 0.8Ω synchronous rectifier, an oscillator, a 0.6Ω N-channel MOSFET power switch, an internal voltage reference, circuitry for pulse-frequency-modulation, and an under voltage parator. The output voltage for the SP6642/6643 devices is preset to +3.3V + 4% or can be adjusted from +2V to +5.5V by manipulating two external resistors. VBATT 1 PFI 2 PFO 3 SHDN 4 SP6642 8 VOUT 7 LX 6 GND 5 FB VBATT 1 PFI 2 BATTLO 3 PFO 4 8 VOUT 7 LX 6 GND 5 FB Rev. 10-6-00 SP6642/6643 High Efficiency Step-Up DC-DC Converter © Copyright 2000 Sipex Corporation ABSOLUTE MAXIMUM RATINGS 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, PFO to GND....-0.3 to 6.0V PFI to GND -0.3 to 6.0V Reverse battery Current, TAMB=+25OC 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) 390m...