The LT?3495/LT3495B/LT3495-1/LT3495B-1 are low noise
boost converters with integrated power switch, feedback
resistor and output disconnect circuitry. The parts control
power delivery by varying both the peak inductor current
and switch off-time. This novel* control scheme results
in low output voltage ripple as well as high effi ciency
over a wide load range. For the LT3495/LT3495-1, the
off-time of the switch is not allowed to exceed a fi xed
level, guaranteeing the switching frequency stays above
the audio band for the entire load range. The parts feature
a high performance NPN power switch with a 650mA
and 350mA current limit for the LT3495/LT3495B and
LT3495-1/LT3495B-1 respectively. The quiescent current
is a low 60μA, which is further reduced to 0.1μA in shutdown.
The internal disconnect circuitry allows the output
voltage to be isolated from the input during shutdown. An
auxiliary reference input (CTRL pin) overrides the internal
1.235V feedback reference with any lower value allowing
full control of the output voltage during operation. The
LT3495 series are available in a tiny 10-lead 3mm × 2mm
DFN package.