The LTC?1502-3.3 is a quadrupler charge pump DC/DC
converter that produces a regulated 3.3V output from a
single alkaline cell input. It requires only five small external
capacitors—no inductors are required. Low supply current
(40mA typical, 5mA in shutdown) and minimal external
components make the LTC1502-3.3 ideal for space and
power conscious single-cell applications. The total printed
circuit board area of the circuit shown below is less than
0.125in2.
Forcing the C1–/SHDN pin low through an external resistive
pull-down puts the part into shutdown mode. During
shutdown, the internal oscillator is stopped and the load is
disconnected from VIN. An internal pull-up current on the
C1–/SHDN pin forces the part back into normal operation
once the pull-down resistance is removed.
The LTC1502-3.3 is short-circuit protected and survives
an indefinite VOUT short to ground. The LTC1502-3.3 is
available in 8-pin MSOP and SO packages.