MIC2155_0911 Datasheet, PDF (9/35 Pages) Micrel Semiconductor – Two-Phase, Single-Output, PWM Synchronous Buck Control IC

Micrel, Inc.
Typical Characteristics
VIN1 UVLO Threshold
4.08
4.06
4.04
4.02
UVLO Rising
4.00
3.98
3.96
3.94 UVLO Falling
3.92
3.90
TEMPERATURE (°C)
Quiescent Current 2
vs. Input Voltage
0.10
0.09
0.08
0.07
0.06
0.05
0.04
0.03
0.02
0.01 _{No Switching}
04 _{6 8 10 12 14 16}
INPUT VOLTAGE (V)
Change in Switching Frequency
vs. Input Voltage
1.00
0.50
0.00
-0.50
-1.00
-1.50
-2.00
-2.54
6 8 10 12 14 16
INPUT VOLTAGE (V)
V
DD
vs. Load
5.5
No Switching
V = 12V
IN
5.0
4.5
4.0
V = 5V
IN
3.5
3.00 _{10 20 30 40 50 60 70}
LOAD (mA)
MIC2155/2156
VIN2 UVLO Threshold
2.75
UVLO Rising
2.70
2.65
2.60
2.55
2.50
2.45 ^{UVLO Falling}
2.40
TEMPERATURE (°C)
Shutdown Current
vs. Input Voltage
0.20
ENABLE1,2 = 0V
IQ1
0.18
0.16
0.14
0.12
0.10
IQ2
0.08
0.06
0.04
0.02
04 _{6 8 10 12 14 16}
INPUT VOLTAGE (V)
Change in Switching Frequency
vs. Temperature
4.00
V = 12V
2.00 ^IN
0.00
-2.00
-4.00
-6.00
-8.00
-10.00
-12.00
-14
TEMPERATURE (°C)
V
DD
vs. Input Voltage
5.5
No Switching
5.0
4.5
4.0
3.5
3.04 _{6 8 10 12 14 16}
INPUT VOLTAGE (V)
Quiescent Current 1
vs. Input Voltage
9
8
7
6
5
4
3
2
1
No Switching
04 _{6 8 10 12 14 16}
INPUT VOLTAGE (V)
Enable Threshold
vs. Temperature
1.08
1.06
V_IN = 12V
1.04
CH1 Rising CH2 Rising
1.02
1.00
0.98
0.96
0.94 CH2 Falling
0.92 _{CH1 Falling}
0.90
0.88
TEMPERATURE (°C)
V
DD
vs. Temperature
5.4
No Switching
5.2
V_IN = 12V
5.0
4.8
4.6
4.4
4.2
V = 5V
IN
4.0
TEMPERATURE (°C)
Feedback Voltage
vs. Temperature
0.6990
V = 12V
IN
0.6985
0.6980
0.6975
0.6970
0.6965
0.6960
TEMPERATURE (°C)
November 2009
9
M9999-111209-B