Step-Down Regulator Gives 97 Percent Efficiency

Austriamicrosystems has introduced the AS1339 step-down regulator. High efficiency and tiny packaging make the AS1339 ideal for multiband WCDMA/NCDMA applications, such as cellular handsets, wireless PDAs and smart phones. The AS1339 delivers up to 650mA from an input voltage range of 2.7 to 5.5V, making the device ideal for single Li-Ion cells. To improve battery lifetime, low-power RF amplifiers can scale the output power dynamically by changing its supply voltage.

To support this, the output voltage of the AS1339 is dynamically controlled using an external analogue input signal. Additionally, the extremely fast 30us settling time of the output voltage ensures CDMA-specifications are not exceeded. The AS1339 is housed in a 2 x 2mm WL-CSP. It is designed for minimal space requirements in size-restricted battery-powered applications such as mobile phones and other portable wireless end equipment.

The 2MHz fixed switching frequency minimises the PCB footprint by allowing the use of tiny low-profile inductors and capacitors. This constant frequency switching results in low predictable output noise, which is also reduced by the internal noise-reduction circuitry. With 97 per cent peak efficiency, the AS1339 boosts battery lifetime in any application. Supporting 1.1A of peak current, the integrated 110m Ohm bypass FET provides maximum power with minimum dropout under even low-battery conditions. The AS1339 enters bypass mode automatically during high power transmissions. The AS1339 also integrates two 10mA low-noise, high-PSRR LDOs, making them ideal for PA biasing.

Each LDO features a separate enable, provides high output-voltage accuracy and requires only 10nF of output capacitance. If the supply is not required, for example in mobile phone in-flight modes, the AS1339 offers a 100nA shutdown mode combined with an output-disconnect feature. Additional features are soft start and safety features such as current overload and thermal shutdown protection. The AS1339 is available in the tiny 2 x 2mm WL-CSP 16-bumps, which covers the industrial temperature range of -40C to +85C.

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