San Jose, Calif.—Micrel says its MIC4722, a 3-by-3 PWM buck regulator working at 2.7 MHz, is the industry's smallest and highest-frequency 3-amp device.
It's suited for next generation xDSL modems and satellite radios. The MIC4722 features proprietary internal compensation which facilitates fast transient response and the use of what the company says is the smallest and most cost-effective LC components possible. "The need for less expensive external components and smaller solution footprints continue to be key for designers across many applications and markets," noted Ralf Muenster, marketing director for power products. "Micrel's MIC4722 buck regulator's industry leading 2.7-MHz operating frequency allows customers to use the combination of a 470 nH inductor and a 4.7 microfarad output capacitor in their application, creating by far the smallest output filter combination available in the market today."
A low-RDS p-channel MOSFET (which also does away with the need for a sense resistor) boosts the regulator's efficiency (94 percent). The device can operate with a maximum duty cycle of 100 percent for use in low-dropout conditions. Output voltage can be adjusted down to 1 volt.
Click here for additional information. The device is currently available in volume, and priced starting at $1.70 each in 1k quantities.
Micrel, 1-408-944-0800, www.micrel.com