LTC1515 Datasheet | Linear Technology

LTC1515 Series Step-Up/Step-Down Switched Capacitor DC/DC Converters with Reset Features s s s s s s s s s s s s s DESCRIPTION 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 acmodate a wide input voltage range (2V to 10V) while maintaining ± 4% regulation. Additional circuitry prevents excessive inrush current and output voltage ripple when large VIN to VOUT 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 VOUT is in regulation. The parts are short-circuit and overtemperature protected. Battery life is maximized by very low operating currents (ICC = 60µA typ, ICC < 1µA in shutdown). All three parts are available in an SO-8 package. , LTC and LT are registered trademarks of Linear Technology Corporation. Adjustable/Selectable 3V, 3.3V or 5V Output Voltages 2V to 10V Input Voltage Range Up to 50m A 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 VIN VOUT Programmable to 3V/5V or 3.3V/5V Short-Circuit and Overtemperature Protected 650k Hz Switching Frequency Open-Drain Power-On Reset Output Daisy-Chained Control Outputs Available in SO-8 Package U APPLICATIONS s s s s SIM Interface in GSM Cellular Telephones Smart Card Readers Local Power Supplies Portable Equipment TYPICAL APPLICATION Programmable 3.3V/5V Power Supply with Power-On Reset 100k LTC1515-X 5V Output vs Input Voltage 5.2 IOUT = 10m A 5/3 = 3V OUTPUT VOLTAGE (V) ON OFF RESET 5V 3.3V 1...