MIC2205 Datasheet, PDF (5/16 Pages) Micrel Semiconductor – 2MHz PWM Synchronous Buck Regulator with LDO Standby Mode

Micrel, Inc.
Typical Characteristics – PWM Mode
Bode Plot
80
70
60
Phase
50
40
30
20 ^VIN ^{= 3.6V}
10 ^VOUT ^{= 1.8V}
0
-10
L = 2.2 H
C_OUT = 2.2 F
C_FF = 120pF
Gain
-20
11E0+02 1E1k+3 1E1+0k4 11E0+05k
FREQUENCY (Hz)
144
126
108
90
72
54
36
18
0
-18
11EM+-636
100
95
90
85
80
75
70
65
60
55
500
2.5V_OUT Efficiency
V_IN = 3V
V_IN = 3.6V
V_IN = 4.2V
100 200 300 400
OUTPUT CURRENT (mA)
1.5V_OUT Efficiency
95
90
V_IN = 3V
85
V_IN = 3.6V
80
75
V_IN = 4.2V
70
65
60
55
500
100 200 300 400
OUTPUT CURRENT (mA)
1.38V_OUT Efficiency
95
90
V_IN = 3V
85
V_IN = 3.6V
80
75
V_IN = 4.2V
70
65
60
55
500
100 200 300 400
OUTPUT CURRENT (mA)
1.0V_OUT Efficiency
90
V_IN = 3V
85
80
V_IN = 3.6V
75
70
V_IN = 4.2V
65
60
55
500 _{100 200 300 400 500 600}
OUTPUT CURRENT (mA)
Frequency
vs. Temperature
2.2
2.15
2.1
2.05
2
1.95
1.9
1.85
V_IN = 3.6V
1.8
-40 -20 0 20 40 60 80 100 120
TEMPERATURE (°C)
1.010
Load Regulation
1.008
1.006
1.004
1.002
1.000
0.998
0.996
0.994 _{VIN = 3.6V}
0.992 _{LowQ = VIN}
0.990 ₀
100 200 300 400
OUTPUT CURRENT (mA)
Peak Current Limit
vs. Supply Voltage
1200
1000
800
600
400
200
LowQ = V_IN
0
2.7 3.4 4.1 4.8 5.5
SUPPLY VOLTAGE (V)
April 2005
5
MIC2205
100
95
90
85
80
75
70
65
60
55
500
1.8V_OUT Efficiency
V_IN = 3V
V_IN = 3.6V
V_IN = 4.2V
100 200 300 400 500 600
OUTPUT CURRENT (mA)
1.2V_OUT Efficiency
95
90
V_IN = 3V
85
80
V_IN = 3.6V
75
V_IN = 4.2V
70
65
60
55
500
100 200 300 400
OUTPUT CURRENT (mA)
Quiescent Current
vs. Supply Voltage
900
800
700
600
500
400
300
200 _{VIN = 3.6V}
100 _{VFB = 0.9V}
02.7
3.4
4.1
4.8
5.5
SUPPLY VOLTAGE (V)
Enable Threshold
vs. Supply Voltage
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
0.6 _{LowQ = VIN}
0.5
2.7 3.4 4.1 4.8 5.5
SUPPLY VOLTAGE (V)
M9999-041105
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