mic3172 Micrel Semiconductor, mic3172 Datasheet - Page 7

• Manufacturer Part Number: mic3172
• Description: 100khz 1.25a Switching Regulators
• Manufacturer: Micrel Semiconductor

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