The LT1301 is a micropower step-up DC/DC converter that
utilizes Burst Mode? operation. The device can deliver 5V
or 12V from a two-cell battery input. It features programmable
5V or 12V output via a logic-controlled input, noload
quiescent current of 120mA and a shutdown pin which
reduces supply current to 10mA. The on-chip power switch
has a low 170mV saturation voltage at a switch current of
1A, a four-fold reduction over prior designs. A 155kHz
internal oscillator allows the use of extremely small surface
mount inductors and capacitors. Operation is guaranteed
at 1.8V input. This allows more energy to be extracted
from the battery, increasing operating life. The ILIM pin can
be used for soft start or to program peak switch current
with a single resistor allowing the use of even smaller
inductors in lighter load applications. The LT1301 is
available in an 8-lead SOIC package, minimizing board
space requirements. For a selectable 3.3V/5V step-up
converter, please see the LT1300. For higher output
power, see the LT1302.