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MIC2202 Scheda tecnica(PDF) 6 Page - Micrel Semiconductor

Il numero della parte MIC2202
Spiegazioni elettronici  HIGH EFFICIENCY 2MHZ SYNCHRONOUS BUCK CONVERTER 1UP STABLE PWM REGULATOR
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Produttore elettronici  MICREL [Micrel Semiconductor]
Homepage  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

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MIC2202
Micrel
M9999-052104
6
May 2004
Functional Description
V
IN
V
IN 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 is recommended for bypassing the
input supply.
Enable
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
Sync_In pin enables the ability to change the fundamental
switching frequency. The Sync_In frequency has a minimum
frequency of 1.6MHz and a maximum sync frequency of
2.5MHz.
Careful attention should be paid to not driving the Sync_In pin
greater than the supply voltage. While this will not damage
the device, it can cause improper operation.
Sync_Out
Sync_Out is an open collector output that provides a signal
equal to the internal oscillator frequency. This creates the
ability for multiple MIC2202s to be connected together in a
master-slave configuration for frequency matching of the
converters. A typical 10k
Ω is recommended for a pull-up
resistor.
Bias
The bias supply is an internal 2.3V linear regulator that
supplies the internal biasing voltage to the MIC2202. 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.
Feedback
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.
10k
SYNC_IN
VIN
MIC2202
“Master”
SYNC_OUT
SW
BIAS
FB
SYNC_IN
VIN
MIC2202
“Slave”
SYNC_OUT
SW
BIAS
FB
Figure 1. Master-Slave Operation


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