MIC2238
2.5MHz Dual Phase
PWM Buck Regulator General Description Features The Micrel MIC2238 is dual output 2-phase synchronous
buck (step down) PWM DC/DC switching regulator. Power
conversion efficiencies of above 95% are easily obtainable
for a wide range of applications and loads. An ultra-low
quiescent current of 28ВµA at light loads assures minimum
current draw in battery powered applications that require
standby modes. The 2.5MHz PWM operation of MIC2238
allows the use of miniature 1ВµH, 2.2ВµH or 4.7ВµH inductor
with the use of 2.2ВµF ceramic output capacitor.
The MIC2238 operates from 2.5V to 5.5V input and is
available in fixed output voltage versions to save space
and reduce external component count. The MIC2238-AA’s
(adjustable version) output voltage versions can be
programmed as low as 0.8V
For applications that require the lowest noise performance,
the /FPWM pin allows the automatic Trickle mode to be
disabled, remaining in full PWM mode. To maximize
battery life in low-dropout conditions, MIC2238 can
operate with a maximum duty cycle of 100%.
The MIC2238 is available in a space-saving 3mm x 3mm
MLFВ®-12L package with a junction temperature range from …
