Datasheet Microchip MIC2285AYMT-TR

MIC2285A
8MHz PWM Synchronous Buck Regulator
with LDO Standby Mode General Description Features The Micrel MIC2285A is a high efficiency 8MHz
PWM synchronous buck (step-down) regulator that
features a LOWQВ® LDO standby mode that draws
only 20ВµA of quiescent current. The MIC2285A
allows an ultra-low noise, small size, and high
efficiency solution for portable power applications.
In PWM mode, the MIC2285A 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® 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 MIC2285A operates from 2.7V to 5.5V input and
features internal power MOSFETs that can supply
up to 600mA output current in PWM mode. It can
operate with a maximum duty cycle of 100% for use …