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LTC1515

Linear Technology
Part Number LTC1515
Manufacturer Linear Technology
Description Step-Up/Step-Down Switched Capacitor DC/DC Converters
Published Mar 27, 2005
Detailed Description 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 DESC...
Datasheet PDF File LTC1515 PDF File

LTC1515
LTC1515

Overview
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 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 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 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 VIN VOUT Programmable to 3V/5V or 3.
3V/5V Short-Circuit and Overtemperature Protected 650kHz 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 = 10mA 5/3 = 3V OUTPUT VOLTAGE (V) ON OFF RESET 5V 3.
3V 1 2 SHDN VOUT 8 VOU...


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