austriamicrosystems has launched the AS1332-34 family of step-down DC-DC regulators optimised for noise sensitive RF power amplifiers in single cell Li-Ion battery powered applications.
The three devices in the family deliver up to 650 mA from an input voltage range of 2,7 to 5,5 V. 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 analog reference voltage is applied to the Vcon input, upon which the output voltage follows the reference voltage within a period of 20 μs (multiplied by an internal gain of 2,5), varying the output between 1,3 and 3,16 V. The output voltage of the AS1333 is fixed at 3,09 V whereas the AS1334 is available in 1,2, 1,5, 1,8, 2,5, 3,0 and 3,3 V output voltage versions.
The devices are designed for minimal space requirements in size-restricted battery-powered applications and is ideally suited for portable wireless end equipment. The 2 MHz 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 2 mV peak-to-peak.
With 97% peak and 94% average efficiency the new buck converter family enhances battery lifetime in any application. Moreover, if no supply is required, the devices offer a shutdown mode requiring only 100 nA 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 and AS1333 are available in the tiny WL-CSP 8-bump while the AS1334 comes in a TDFN(3 x 3)-10 package covering the temperature range of
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