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, pointing devices and other low-power portable products. This application note is for users like medical devices, emergency lighting and others who need twice the output current than the datasheet specified values for the SP6642/6643. Typically specified at 20mA for 3.3V out with a 1.2V input, the SP6642 can actually output double the current if a lower value of inductor is selected.

■ 40mA Output Current for the SP6642/3 Single Cell to 2V to 5V Converter
■ High Efficiency: 81%
■ Twice the Output Current as the Pin-to-Pin Compatible MAX1642/3
■ 0.75V Start-up Voltage