Features

• Input Voltage Range: 0.9V to 1.8V
• 0.9V Guaranteed Start-Up Voltage
• Regulated Output Voltage: 3.3V ±4%
• Output Current: 10mA (V_IN >/= 1V)
• No Inductors
• Shutdown Disconnects Load from V_IN
• Low Operating Current: 40µA
• Low Shutdown Current: 5µA
• Short-Circuit and Overtemperature Protected
• Application Circuit Fits in <0.125in² PCB Area
• Available in 8-Pin MSOP and SO Packages

Typical Application

Description

The LTC1502-3.3 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 (40µA typical, 5µA 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 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 V_IN. 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.