MIC2205YML EV: 1.8V @ 600mA, 2.7 ~ 5.5V in, Buck

The Micrel MIC2205 is a high efficiency 2 MHz PWM synchronous stepp-down switching regulator that features a LOWQ™ LDO standby mode that draws on 18µA of quiescent current. The MIC2205 features an ultra-low noise, small size, and high efficiency solution for portable power products.

In PWM mode, the MIC2205 operates at a constant frequency of 2 MHz. Under light load conditions, such as in system sleep or standby modes, the PWM switching opration can be disabled to reduce switching losses. In this light load LOWQ™ mode, the LDO maintains the output voltage and draws on 18µA of quiescent current. The LDO mode of operation saves battery life while not introducing spurious noise and high ripple as experienced with pulse skipping or bursting mode regulators.

The MIC2205 operates from a 2.7V to 5.5V input and features internal power MOSFETs that can supply up to 600mA of output current in PWM mode. It can operate with a maximum duty cycle of 100% for use in low dropout conditions.

The MIC2205 evaluation board requires an input power source that is able to deliver greater than 1A at 2.7V. The output load can either be an active or passive source.