DC/DC step down regulator
Micrel has introduced a high performance 600mA DC/DC step down regulator, the MIC2808. The device is intended for powering a power amplifier (PA) in mobile devices and comes with dual low noise low dropout regulators for rf chipset support.
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"Today's mobile devices continue to demand long battery life and small size," noted Andy Khayat, business unit director of Micrel's portable product group. "The MIC2808 gives rf system designers a tiny power supply with maximum PA efficiency regardless of user distance to the nearest cellular base station."
The MIC2808 has a 600mA, 2MHz constant frequency pulse width modulated (PWM) DC/DC regulator with DAC voltage control and 1A bypass mosfet. According to Micrel, the regulator will work in a 100% duty cycle mode to provide maximum power and efficiency. It offers dual low noise low dropout regulators which are optimized for high PSRR capability and fast turn-on times. The MIC2808 has thermal shutdown and current limit protection, is available in a 16pin 2x 2.5mm MLF, and offers a junction operating range from -40 to 125°C.