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MIC2172
100kHz 1.25A Switching Regulators
Micrel
MIC2172 Datasheet PDF : 17 Pages
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MIC2172/3172
Typical Performance Characteristics
Error Amplifier Gain
5.0
4.5
4.0
3.5
3.0
2.5
2.0
1.5
1.0
0.5
0.0
-100 -50 0 50 100 150
Temperature (
°
C)
7000
6000
5000
4000
3000
2000
1000
0
1
Error Amplifier Gain
10 100 1000 10000
Frequency (kHz)
Micrel, Inc.
Error Amplifier Phase
-30
0
30
60
90
120
150
180
210
1
10 100 1000 10000
Frequency (kHz)
Block Diagram MIC2172
V
I N
Pin 5
SYNC
Pin 4
2.3V
Reg.
100kHz
Osc.
Logic
FB
Pin 3
1.24V
Ref.
Error
Amp.
Com-
parator
S
GND
Pin 1
COMP
Pin 2
Anti-Sat.
V
SW
Pin 7
D1
Driver
Q1
Current
Amp.
PP
GND GND
21
Pin 6 Pin 8
April 2005
7
M9999-042205
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