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MIC2203 Datasheet(PDF) 6 Page - Micrel Semiconductor

Part No. MIC2203
Description  High Efficiency 1MHz Synchronous Buck Regulator
Download  13 Pages
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Maker  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC2203 Datasheet(HTML) 6 Page - Micrel Semiconductor

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Micrel, Inc.
Functional Description
provides power to the output and to the internal
bias supply. The supply voltage range is from 2.3V
to 5.5V. A minimum 1
µF ceramic capacitor is
recommended for bypassing the input supply.
The enable pin provides a logic level control of the
output. In the off state, supply current of the device
is greatly reduced (typically <1
µA). Also, in the off
state, the output drive is placed in a “tri-stated”
condition, where both the high side P-Channel
MOSFET and the low-side N-Channel are in an off
or non-conducting state. Do not drive the enable pin
above the supply voltage.
SYNC_IN pin enables the ability to change the
fundamental switching frequency. The SYNC_IN
frequency has a minimum frequency of 800KHz and
a maximum sync frequency of 1.2MHz. Careful
attention should be paid to not driving the SYNC_IN
pin greater than the supply voltage. Although this will
not damage the device, it can cause improper
SYNC_OUT is an open collector output that
provides a signal equal to the internal oscillator
frequency. This creates the ability for multiple
MIC2203s to be connected together in a master-
slave configuration for frequency matching of the
converters. A typical 10kΩ resistor is recommended
for the pull-up resistor.
The bias supply is an internal 2.3V linear regulator
that supplies the internal biasing voltage to the
MIC2203. A 10nF ceramic capacitor is required on
this pin for bypassing. Do not use the bias pin as a
supply. The bias pin was designed to supply internal
power only.
The feedback pin provides the control path to control
the output. A resistor divider connecting the
feedback to the output is used to adjust the desired
output voltage. Refer to the feedback section in the
“Applications Information” for more detail.
December 2004
(408) 955-1690

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