MIC2172 Datasheet, PDF (7/16 Pages) Micrel Semiconductor – 100kHz 1.25A Switching Regulators Preliminary Information

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
Error Amplifier Phase
-30
0
30
60
90
120
150
180
210
1
10 100 1000 10000
Frequency (kHz)
4
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
1997
4-19