特点
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
典型应用
典型应用
描述
描述 The LTC?1515, 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 overtemperature 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.