MIC33050

MIC33050 4MHz Internal Inductor PWM Buck Regulator with HyperLight Load® General Description Features The Micrel MIC33050 is a high-efficiency 600mA PWM synchronous buck (step-down) regulator with internal inductor featuring HyperLight Load, a patent-pending switching scheme that offers best-in-class light load efficiency and transient performance while providing very small external components and low output ripple at all loads. The MIC33050 also has a very-low typical quiescent current of 20µA and can achieve over 85% efficiency even at 1mA. In contrast to traditional light load schemes, the HyperLight Load architecture does not trade off control speed to obtain low standby currents and in doing so, the device only needs a small output capacitor to absorb the load transient as the powered device goes from light load to full load. At higher loads, the MIC33050 provides a constant switching frequency of greater than 4MHz while providing peak efficiencies greater than 93%. The MIC33050 is available in fixed and adjustable output voltages and comes in a 12-pin 3mm x 3mm MLF® with a junction operating range of –40C to +125C. Data sheets and support documentation can be found on Micrel’s web site at: www.micrel.com.  Input voltage: 2.7V to 5.5V  600mA output current  Fixed and adjustable output voltage options  No external inductor required  Ultra-fast transient response  20µA quiescent current  4MHz switching in PWM mode  Low output voltage ripple  >93% peak effici...