Features

• Adjustable/Selectable 3V, 3.3V or 5V Output Voltages
• 2V to 10V Input Voltage Range
• Up to 50mA Output Current
• Only Three External Capacitors Required
• Soft Start Limits Inrush Current at Turn-On
• Low Operating Current: 60µA
• Very Low Shutdown Current: < 1µA
• Shutdown Disconnects Load from V_IN
• V_OUT Programmable to 3V/5V or 3.3V/5V
• Short-Circuit and Overtemperature Protected
• 650kHz Switching Frequency
• Open-Drain Power-On Reset Output
• Available in SO-8 Package

Typical Application

Description

The LTC1515, LTC1515-3/5 and LTC1515-3.3/5 are micropower switched capacitor DC/DC converters that produce a regulated output voltage by either stepping up or stepping down the input voltage. Output voltage is adjustable using an external resistor divider (LTC1515) or programmable to either 3V/5V (LTC1515-3/5) or 3.3V/5V (LTC1515-3.3/5) using a logic pin.A unique architecture allows the parts to accommodate a wide input voltage range (2V to 10V) while maintaining ±4% regulation. Additional circuitry prevents excessive inrush current and output voltage ripple when large V_IN to V_OUT differentials are present.An internal power-on reset circuit forces the POR pin low on initial power-up. The POR output remains low until 200ms (typ) after V_OUT is in regulation.The parts are short-circuit and over-temperature protected. Battery life is maximized by very low operating currents (I_CC = 60µA typ, I_CC<1µA in shutdown). All three parts are available in an SO-8 package.