MIC2245 Datasheet, PDF (5/14 Pages) Micrel Semiconductor – 4MHz PWM Synchronous Buck Regulator with LDO Standby Mode

Micrel, Inc.
Typical Characteristics – PWM Mode
100
90
80
70
60
50
40
30
20
10
00
2.5V_OUT Efficiency
V_IN=3.2V
V_IN=3.6V
V_IN=4.2V
100 200 300 400 500
OUTPUT CURRENT (mA)
100
90
80
70
60
50
40
30
20
10
00
1.8V_OUT Efficiency
V_IN=3.2V
V_IN=3.6V
V_IN=4.2V
100 200 300 400 500
OUTPUT CURRENT (mA)
1.2V_OUT Efficiency
100
90 ^VIN=3.2V
80
70
V_IN=3.6V
60
50
V_IN=4.2V
40
30
20
10
00 _{100 200 300 400 500}
OUTPUT CURRENT (mA)
1.0V_OUT Efficiency
100
90 ^VIN=3.2V
80
70
V_IN=3.6V
60
50 VIN=4.2V
40
30
20
10
00 _{100 200 300 400 500}
OUTPUT CURRENT (mA)
Quiescent Current
vs. Input Voltage
900
850
800
750
700
650
6020.7 _{3.1 3.5 3.9 4.3 4.7 5.1 5.5}
INPUT VOLTAGE (V)
Frequency
vs. Input Voltage
4.5
4.3
4.1
3.9
3.27.7 _{3.1 3.5 3.9 4.3 4.7 5.1 5.5}
INPUT 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)
January 2006
5
MIC2245
1.5V_OUT Efficiency
100
90 ^VIN=3.2V
80
70
V_IN=3.6V
60
V_IN=4.2V
50
40
30
20
10
00 _{100 200 300 400 500}
OUTPUT CURRENT (mA)
Load Regulation
1.004
1.002
1.000
0.998
0.996 _VIN=3.6V
0.994 ^LowQ=VIN
0.992
0.9900
100 200 300 400 500
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)
M9999-012406
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