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MIC5209-3.6BU Datasheet(PDF) 10 Page - Micrel Semiconductor

Part # MIC5209-3.6BU
Description  500mA Low-Noise LDO Regulator
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC5209-3.6BU Datasheet(HTML) 10 Page - Micrel Semiconductor

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MIC5209
Micrel, Inc.
M9999-060906
10
June 2006
Fixed Regulator Circuits
MIC5209-x.xBM
IIN
N
OUT
OUT
GND
1µF
VIN
VOUT
EN
BYP
1
2
5–8
3
4
Figure 1. Low-Noise Fixed Voltage Regulator
Figure 1 shows a basic MIC5209-x.xBM (SO-8) fixed-voltage
regulator circuit. See Figure 5 for a similar configuration us-
ing the more thermally-efficient MIC5209-x.xBS (SOT-223).
A 1µF minimum output capacitor is required for basic fixed-
voltage applications.
MIC5209-x.xBM
IIN
N
OUT
OUT
GND
470pF
VIN
EEN
N
BYP
BYP
1
2
5–8
3
4
2.2µF
VOUT
Figure 2. Ultra-Low-Noise Fixed Voltage Regulator
Figure 2 includes the optional 470pF noise bypass capacitor
between BYP and GND to reduce output noise. Note that the
minimum value of COUT must be increased when the bypass
capacitor is used.
Adjustable Regulator Circuits
MIC5209BM
IIN
N
OUT
OUT
GND
VIN
EEN
N
ADJ
ADJ
1
2
5–8
3
4
1µF
VOUT
R1
R2
Figure 3. Low-Noise Adjustable Voltage Regulator
The MIC5209BM/U can be adjusted to a specific output volt-
age by using two external resistors (Figure 3). The resistors
set the output voltage based on the equation:
V
= 1.242V
+ R2
R1
OUT
V
V
1






This equation is correct due to the configuration of the
bandgap reference. The bandgap voltage is relative to the
output, as seen in the block diagram. Traditional regula-
tors normally have the reference voltage relative to ground;
therefore, their equations are different from the equation for
the MIC5209BM/U.
AlthoughADJisahigh-impedanceinput,forbestperformance,
R2 should not exceed 470kΩ.
MIC5209BM
IN
OUT
GND
VIN
EN
ADJ
1
2
5–8
3
4
2.2µF
VOUT
R1
R2
470pF
Figure 4. Ultra-Low-Noise Adjustable Application.
Figure 4 includes the optional 470pF bypass capacitor from
ADJ to GND to reduce output noise.
Slot-1 Power Supply
Intel’s Pentium II processors have a requirement for a 2.5V
±5% power supply for a clock synthesizer and its associated
loads. The current requirement for the 2.5V supply is depen-
dant upon the clock synthesizer used, the number of clock
outputs, and the type of level shifter (from core logic levels to
2.5V levels). Intel estimates a worst-case load of 320mA.
The MIC5209 was designed to provide the 2.5V power
requirement for Slot-1 applications. Its guaranteed perfor-
mance of 2.5V ±3% at 500mA allows adequate margin for
all systems, and its dropout voltage of 500mV means that it
operates from a worst-case 3.3V supply where the voltage
can be as low as 3.0V.
MIC5209-x.xBS
IIN
N
OUT
OUT
GND
COUT
22µF
VIN
VOUT
1
2,TAB
3
CIN
0.1µF
Figure 5. Slot-1 Power Supply
A Slot-1 power supply (Figure 5) is easy to implement. Only
two capacitors are necessary, and their values are not criti-
cal. CIN bypasses the internal circuitry and should be at least
0.1µF. COUT provides output filtering, improves transient
response, and compensates the internal regulator control
loop. Its value should be at least 22µF. CIN and COUT may
be increased as much as desired.
Slot-1 Power Supply Power Dissipation
Powered from a 3.3V supply, the Slot-1 power supply of
Figure 5 has a nominal efficiency of 75%. At the maximum
anticipated Slot 1 load (320mA), the nominal power dissipa-
tion is only 256mW.
The SOT-223 package has sufficient thermal characteristics
for wide design margins when mounted on a single layer
copper-clad printed circuit board. The power dissipation of
the MIC5209 is calculated using the voltage drop across the
device × output current plus supply voltage × ground current.


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