Micrel Rolls Out Family of 2MHz Integrated Switch Non-Synchronous PWM Buck Regulators

Micrel Inc. launched a new family of 2 MHz PWM buck regulators. The new solutions include the MIC4723 (3A); the MIC4720 (2A); and the MIC4721 (1.5A). The MIC4723 and MIC4720 are offered in a 3mm x 3mm MLF®-12 and a thermally-enhanced MSOP-10 package, while the MIC4721 is offered in a MSOP-10. The MIC4720/21/23 ICs are the latest additions to Micrel’s small footprint, non-synchronous buck regulator family that also includes the MIC4722 introduced late last year. This family of products targets wired and wireless broadband communications, printers, HD set top boxes, computing peripherals and low power FPGAs where total solution cost is critical.

"In today’s multiple-rail world, there is an insatiable need for cost-effective power solutions addressing different current requirements. In addition, smaller solution footprints continue to be key for designers across many applications and markets," noted Ralf Muenster, Micrel’s Marketing Director for Power Products. "Micrel’s MIC4720/21/23 buck regulator family has an operating frequency of 2 MHz, which allows customers to use the combination of a 1uH inductor and a 4.7µF output capacitor in their application, thus creating an ultra-small output filter."

The MIC4720/21/23 feature ultra-fast operation and a proprietary internal compensation which allows for extreme transient response and the use of the smallest and most cost-effective LC components in their class. A low resistance integrated p-channel MOSFET enables the chips to deliver up to 3, 2 and 1.5A, respectively, with more than 94% efficiency. The output voltage can be adjusted down to 1V and can operate with a maximum duty cycle of 100% for use in low dropout conditions. The P-MOSFET also does away with the need for a sense resistor to provide a current limit, further reducing the need for external components.

The MIC4720/21/23 devices are available in volume with pricing starting at $1.40/$1.22/$1.53 for 1K quantities.