MIC2267

MIC2267 Input Current Limiting Synchronous Buck Regulator USB Power Maximizer™ General Description The MIC2267 is a USB Power Maximizer™ which transfers the maximum power from the limited USB current source by shaping the input current limit profile. It incorporates a high efficiency, integrated synchronous step down regulator. Internal 150mΩ switches and adjustable operating frequency allows the MIC2267 to achieve greater than 90% efficiency across a broad load range. It replaces the USB current limit switch, 5V buck regulator and minimizes capacitance for many USB applications. The adjustable frequency control can be utilized to move harmonics away from sensitive frequency bands. The MIC2267 allows the input current limit profile to be shaped for various applications. With a current mode control with external compensation, the MIC2267 transient response can be optimized over load and output capacitance making it highly flexible for many applications. Additional features include 1µA shutdown current, output current limit and thermal shutdown protection. The MIC2267 is available in a 12-pin 3mm x 3mm MLF® with a junction operating range from –40°C to +125°C. Datasheets and support documentation can be found on Micrel’s web site at: www.micrel.com. Features Input voltage range: 3.0V to 5.5V Output voltage adjustable down to 1.0V Up to 96% efficiency at 500mA output Efficiency >90% across a broad load range Fast transient response Adjustable frequenc...