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Micrel touts tiny dual synchronous converter

Posted: 16 Jan 2008     Print Version  Bookmark and Share

Keywords:buck converter  step-down converters  DC/DC 

Micrel Inc. has launched the MIC23250, claimed to be the industry's smallest high-efficient, dual 400mA 4MHz PWM synchronous buck step-down converter housed in a 2-by2mm, 10-lead MLF package. This device is suited for today's portable applications where high efficiency, low output ripple and small size are crucial. The MIC23250 uses a proprietary switching method called "Hyper Light Load" that achieves high efficiency, very low output ripple and fast transient response while using very small output capacitors. The MIC23250 is available in volume with pricing starting at Rs.58.03 ($1.47) for 1,000 quantities.

This combination of high efficiency and fast transient response makes the MIC23250 a perfect choice to power the latest generation of low-voltage microprocessor cores and peripheral devices for mobile handsets, GPS, PDAs, portable media players (PMP) other portable devices. The MIC23250 integrates two synchronous rectified DC/DC converters, which eliminates the need for external MOSFETs. The device accommodates an input voltage range of 2.7-5.5V, and has fixed preset output voltage options down to as low as 0.72V. Under normal loads, the MIC23250 features 4MHz CCM PWM operation mode and automatically transitions to a variable frequency Hyper Light Load operation mode during light load conditions to maintain very high efficiency. The MIC23250 also features 35?A typical quiescent current (both regulators operating), ultrafast line and load transient response. This, while providing a low voltage output ripple of 20mVpp in Hyper Light Load mode and less than 3mV output voltage ripple in full PWM mode. With up to 94 per cent peak efficiency and approximately 85 per cent at 1mA load, the MIC23250 is a perfect choice where size, efficiency and low noise are paramount design considerations. The MIC23250 is available in a tiny 10-pin 2-by-2mm MLF with a junction operating range from -40?C to 125?C.

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