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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 RF Power Amplifi ersAS1332POWER MANAGEMENTDC-DC Step-downConvertersMOBILE ENTERTAINMENT AUDIO <strong>SE</strong>NSING INTERFACES LIGHTING MANAGEMENT RF PRODUFCTS / RFID DATA CONVERTERSGeneral Descriptionto power radiofrequency (RF) power amplifi ers (PAs) from a single Li-Ionbattery. The device also achieves high-performance in mobile phones andsimilar RF PA applications.The AS1332 steps down an input voltage of 2.7V to 5.5V to outputvoltages ranging from 1.3V to 3.16V. Using a VCON analog input, theoutput voltage is set for controlling power levels and effi ciency of the RFPA.The RF interferences are minimized due to the fi xe-frequency PWMoperation. The battery consumption is reduced to 0.01μA (typ.) duringshutdown.Because of the high switching frequencies (2 MHz) tiny surface-mountcomponents can be used. Additional to the small size the amount is alsosmall. Only three external components are requiered, an inductor and twoceramic capacitors.The AS1332 is available in a 8-pin WL-CSP.Block DiagramVIN2.7V to 5.5VTypical Application Circuit10 μFENVCONPVINAS1332PGNDKey Features- PWM Switching Frequency: 2MHz- Single Lithium-Ion Cell Operation (2.7V to 5.5V)- Dynamic Programmable Output Voltage (1.3V to 3.16V)- Programmable output voltage range: 1.8 to 3.3V in 0.1V steps- Maximum load capability of 650mA- <strong>High</strong> Effi ciency (96% Typ at 3.6 VIN, 3.16 VOUT at 400mA) from internalsynchronous rectifi cation- Current Overload Protection- Thermal Overload Protection- Supply range: 3 to 5.5V- Soft Start- Shutdown current: ≤1μA- 8-pin WL-CSPApplicationsThe AS1332 is an ideal solution for cellular phones, hand-held radios, RFPC cards, and battery powered RF devices.VDDAGNDSWFB3.3 μH4.7 μFVOUT1.3V to 3.16VVOUT = 2.5 x VCON22www.austriamicrosystems.comRevision 0.12

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