High Performance Analog IC Portfolio - SE Spezial-Electronic Sp. z o.o
High Performance Analog IC Portfolio - SE Spezial-Electronic Sp. z o.o
High Performance Analog IC Portfolio - SE Spezial-Electronic Sp. z o.o
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650mA, Step Down DC/DC Converter for Portable ApplicationsAS1334POWER MANAGEMENTDC-DC Step-downConvertersMOBILE ENTERTAINMENT AUDIO <strong>SE</strong>NSING INTERFACES LIGHTING MANAGEMENT RF PRODUFCTS / RFID DATA CONVERTERSGeneral DescriptionThe AS1334 is a step-down DC-DC converter designed to power portableapplications from a single Li-Ion battery. The device also achieves highperformancein mobile phones and other applications requiring lowdropout voltage.The AS1334 steps down an input voltage of 2.7V to 5.5V to a fi xedoutput voltage of 1.2, 1.5, 1.8, 2.5, 3.0, 3.3V.Fixed-frequency PWM operation minimizes RF interference. Shutdownfunction turns the device off and reduces battery consumption to 0.01μA(typ.).The AS1334 is available in a TDFN(3x3) package. A high switchingfrequency (2 MHz) allows use of tiny surface-mount components. Onlythree small external surface-mount components, an inductor and twoceramic capacitors are required.Block DiagramVINTypical Application Circuit10 μFENNCPVINAS1334-18PGNDKey Features- PWM Switching Frequency: 2MHz- Single Lithium-Ion Cell Operation- Fixed Output Voltage (1.2 to 3.3V)- Maximum load capability of 650mA- <strong>High</strong> Effi ciency (96% Typ at 3.6 VIN, 3.0 VOUT at 400mA) from internalsynchronous rectifi cation- Current Overload Protection- Thermal Overload Protection- Soft Start- Low Dropout Voltage (140 mΩ Typ PFET)- TDFN(3x3)ApplicationsThe AS1334 is an ideal solution for cellular phones, hand-held radios, RFPC cards, battery powered RF devices, and RF<strong>IC</strong> chipsets.VDDAGNDSWFB3.3 μH10 μFVOUT1.8V24www.austriamicrosystems.comRevision 0.06
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