SP6642
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
8 VOUT 7 LX 6 GND 5 FB
VBATT 1 PFI 2 BATTLO 3 PFO 4
SP6643
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...
