Datasheet Microchip MIC2285 — Datenblatt

MIC2285
8MHz PWM Synchronous Buck
Regulator with LDO Standby Mode General Description Features The Micrel MIC2285 is a high efficiency 8MHz pulse
width modulated (PWM) synchronous buck (stepdown) regulator that features a LOWQв„ў LDO standby
mode that draws only 18ВµA of quiescent current. The
MIC2285 allows an ultra-low noise, small size, and
high efficiency solution for portable power applications. 2.7 to 5.5V supply/input voltage Light load LOWQв„ў LDO mode
20ВµA quiescent current
Low noise, 75ВµVrms 8MHz PWM mode
Output current to 500mA
>90% efficiency
100% maximum duty cycle Adjustable output voltage option down to 1V
Fixed output voltage options available Ultra-fast transient response Uses a tiny 0.47µH inductor Enables sub 1mm profile solution Fully integrated MOSFET switches Micropower shutdown Thermal shutdown and current limit protection Pb-free 10-pin 3mm x 3mm MLF package –40°C to +125°C junction temperature range In PWM mode, the MIC2285 operates with a constant
frequency 8MHz PWM control. Under light load
conditions, such as in system sleep or standby modes,
the PWM switching operation can be disabled to
reduce switching losses. In this light load LOWQв„ў
mode, the LDO maintains the output voltage and
draws only 18ВµA 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 MIC2285 operates from a 2.7V to 5.5V input …