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MIC2267 Datasheet(PDF) 14 Page - Micrel Semiconductor

Part # MIC2267
Description  Input Current Limiting Synchronous Buck Regulator
PDF  19 Pages
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC2267 Datasheet(HTML) 14 Page - Micrel Semiconductor

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Micrel Inc.
MIC2267
January 2011
14
M9999-011711-A
CIN
Connect a ceramic capacitor of X5R or X7R dielectric
from the VIN pin to PGND as close to the MIC2267 as
possible to decouple the high di/dt switching current
paths. A minimum value of 10µF is recommended for
most applications. An additional 22µF can be useful in
reducing ringing effects if long power leads are used to
connect power.
COUT
Connect a ceramic capacitor of X5R or X7R dielectric
from VOUT to PGND as close as possible to the inductor
and CIN ground connection to reduce the effect of high
di/dt ground currents from interfering with internal
signals. A minimum of 47µF is recommended for most
applications. Additional bulk capacitance such as
electrolytic, tantalum or ceramic can be added to
improve transient performance and hold up during large
load transients.
5V Pass Through
Some applications will require a legacy 5v supply to be
available which also benefits from the current limit
protection. The circuit in Figure 5 allows for a low current
bias supply to be provided while still providing current
limit protection.
VIN
EN
FREQ
SW
FB
COMP
AGND
PGND
LIMIT
MIC2267
10uF
4.7uH
PGOOD
10k
FILTER
22nF
110k
100µF 150µF 150µF
23k
10k
680pF
SLOPEC
75k
11.5k
15nF
100k
VIN = 5.0V USB
VOUT2 = 4.75V
1A Schottky
10uF
VOUT1 = 3.3V
Figure 3. Standard MIC2267 Circuit with
Protected ~5v Bias Supply
Below are some oscilloscope shots of the Pass through
circuit operating under the following conditions:
Normal operation:
VOUT1 = 3.3v @ 200mA Continuous Load
VOUT2 = 4.75v @ 80mA to 200mA Pulsing Load
Over Current peaks applied:
VOUT1 = 3.3v @ 200mA Continuous Load
VOUT2 = 4.75V @ 80mA to 600mA Pulsing Load
Normal operation; no Over Current
Over Current Peaks applied on VOUT2



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