High Performance Analog IC Portfolio - SE Spezial-Electronic Sp. z o.o

130mA 5.0V Step-Up DC-DC ConverterAS1321POWER MANAGEMENTDC-DC Step-upConvertersMOBILE ENTERTAINMENT AUDIO SENSING INTERFACES LIGHTING MANAGEMENT RF PRODUFCTS / RFID DATA CONVERTERSGeneral DescriptionThe AS1321 is a high-effi ciency step-up DC-DC converter designed togenerate a fi xed voltage of 5.0V.The AS1321 achieves an effi ciency of up to 90%. The minimum inputvoltage is 1.5V, the output voltage is fi xed at 5.0V, and output current isup to 130mA.In order to save power the AS1321 features a shutdown mode, where itdraws less than 1μA. In shutdown mode the battery is connected directlyto the output enabling the supply of real-time-clocks.The AS1321 provides a power-on reset output that goes high-impedancewhen the output reaches 90% of its regulation point.The SHDNN trip threshold of the AS1321 can be used as an input voltagedetector that disables the device when the battery voltage falls to apredetermined level.An internal synchronous rectifi er is included, which is parallel with theexternal Schottky diode.The AS1321 is available in a 6-pin SOT23 package.Application Diagram+1.5 to +5.0VBatteryCIN22μFOnOffL110μH2BATT4LX1SHDNNKey Features- Fixed output voltage: 5.0V- Output current: up to 130mA- Internal synchronous rectifi er- Shutdown mode supply current: less than 1μA- Effi ciency: up to 96%- Minimum input voltage: +1.5V- Power on reset- Low-battery cutoff- Battery input connected to Pin OUT in shutdownmode for backup power- 6-pin SOT23 packageApplicationsThe AS1321 is ideal for low-power applications where ultra-small sizeis critical as in medical diagnostic equipment, hand-held instruments,pagers, digital cameras, remote wireless transmitters, cordless phones,and PC cards. The device is also perfect as a local 5.0V supply or as abattery backup.AS13215OUT6RESETN3GNDCOUT22μFR1100kΩ+5.0VOutputRESETNOutput28www.austriamicrosystems.comRevision 1.01