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Buck regulators target RF power amplifiers

Posted: 25 Mar 2009     Print Version  Bookmark and Share

Keywords:DC-DC regulators  RF power amplifiers  Li-Ion cells 

AS1332-34 family

austriamicrosystems has announced the availability of the AS1332-34 family of step down DC-DC regulators designed for noise sensitive RF power amplifiers in single cell Li-Ion battery powered applications.

The three devices in the AS1332-34 family deliver up to 650mA from an input voltage range of 2.7 to 5.5V making the devices ideal for single Li-Ion cells. The AS1332 is optimised for low power RF amplifiers where the output power is dynamically scaled by the supply voltage to improve battery lifetime. An external analogue reference voltage is applied to the Vcon input, upon which the output voltage follows the reference voltage within a period of 20µs (multiplied by an internal gain of 2.5), varying the output between 1.3 to 3.16V. This fast rise and fall time ensures plenty of operational margin. The output voltage of the AS1333 is fixed at 3.09V whereas the AS1334 is available in 1.2, 1.5, 1.8, 2.5, 3.0 and 3.3V output voltage versions.

The AS1332-34 family is designed for minimal space requirements in size-restricted battery-powered applications and is ideal for mobile phones and other portable wireless end equipment. The 2MHz fixed switching frequency minimises PCB footprint by allowing the use of tiny, low profile inductors and capacitors. This constant frequency switching, together with internal noise reduction circuitry, results in an output voltage ripple of less than 2mV peakto- peak.

"Power efficiency combined with reduced external component size and cost is the key behind the AS1332-34 buck converter family," said Bruce Ulrich, Marketing Director Standard Linear at austriamicrosystems.

"austriamicrosystems' AS1332-34 family is the perfect symbiosis between efficiency and analogue performance.

Thanks to its small size and fast switching speed only a minimum of PCB space is required. Combined with the unique low noise circuitry this part is first choice for high efficiency RF PA designs."

With 97% peak and 94% average efficiency the new buck converters increase battery lifetime in any application. Moreover, if no supply is required, for example in mobile phone in-flight mode, the AS1332-34 offers a shutdown mode requiring only 100nA current combined with an output disconnect feature. Additional features are soft start and power-ok, available on the AS1334. Safety features include current overload and thermal shutdown protection.

The AS1332/33 is available in the tiny WL-CSP 8-bumps while the AS1334 comes in a TDFN (3x3)-10 package covering the industrial temperature range of -40°C to 85°C.

Visit Power Design India for technical articles on buck regulators.

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