MIC2198_05 Datasheet, PDF (4/14 Pages) Micrel Semiconductor – 500kHz 4mm × 4mm Synchronous Buck Controller

MIC2198
Typical Characteristics
(V_IN = 12V, unless otherwise noted)
Quiescent Current
vs. Temperature
4.0
3.5
PWM
3.0
2.5
2.0
1.5
UVLO
1.0
0.5
Shutdown
0-40 _{-20 02 04 06 08 0 100120140}
TEMPERATURE (°C)
0.820
V_FB
vs. Temperature
0.815
0.810
0.805
0.800
0.795-40 _{-20 02 04 06 08 0 100120140}
TEMPERATURE (°C)
V_DD
5.20
vs. Temperature
5.15
5.10
5.05
5.00
4.95
4.90
4.85
4.80-40 _{-20 02 04 06 08 0 100120140}
TEMPERATURE (°C)
Overcurrent Threshold
vs. Temperature
78
76
74
72
70
68
66
64
-40 -20 02 04 06 08 0 100120140
TEMPERATURE (°C)
MIC2198
Quiescent Current
vs. Supply Voltage
4.0
3.5
PWM
3.0
2.5
2.0
1.5
UVLO
1.0
0.5
0
4
Shutdown
9 14 19 24 29 34
SUPPLY VOLTAGE (V)
V_DD
Line Regulation
6.0
5.0
4.0
3.0
2.0
1.0
0
0 4 8 12 16 20 24 28 32
SUPPLY VOLTAGE (V)
Oscillator Frequency
vs. Temperature
10
8
6
4
2
0
-2
-4
-6
-8
-10
-40 -20 02 04 06 08 0 100120140
TEMPERATURE (°C)
Current Limit
Foldback
3.5
3.0
2.5
2.0
1.5 _{V IN = 5V}
1.0 ^{VOUT = 3.3V}
R _CS = 20mV
0.5
00
1
2
3
4
5
OUTPUT CURRENT (A)
4
Micrel, Inc.
0.805
V_FB
Line Regulation
0.800
0.795
0.7900
5 10 15 20 25 30 35
SUPPLY VOLTAGE (V)
5.02
5.01
5.00
4.99
4.98
4.97
4.96
4.95
4.94
0
V_DD
Load Regulation
5 10 15 20 25 30
LOAD CURRENT (mA)
0.25
0.20
0.15
0.10
0.05
0.00
-0.05
-0.10
-0.15
0
Oscillator Frequency
vs. Supply Voltage
5 10 15 20 25 30 35
SUPPLY VOLTAGE (V)
October 2005