MIC2288_05 Datasheet, PDF (4/11 Pages) Micrel Semiconductor – 1A 1.2MHz PWM Boost Converter in Thin SOT-23 and 2×2 MLF

MIC2288
Typical Characteristics
Efficiency at V_OUT = 12V
91
89
V_IN = 4.2V
87
85
83
V_IN = 3.6V
81
79
V_IN = 3.3V
77
750 _{25 50 75 100 125 150}
OUTPUT CURRENT (mA)
Current Limit
vs. Supply Current
1.8
1.6
1.4
1.2
1
0.8
0.6
0.4
0.2
02.5 _{4 5.5 7 8.5 10}
SUPPLY VOLTAGE (V)
700
600
500
400
300
200
100
00
Switch Saturation
vs. Current
V_IN = 3.6V
200 400 600 800 1000
SWITCH CURRENT (mA)
Maximum Duty Cycle
vs. Supply Voltage
100
98
96
94
92
90
88
86
84
82
80
2.5 4 5.5 7 8.5 10
SUPPLY VOLTAGE (V)
M9999-042205
12.2
12.15
12.1
12.05
12
11.95
11.9
11.85
11.80
Load Regulation
V
IN
=
3.6V
25 50 75 100 125 150
LOAD (mA)
Current Limit
vs. Temperature
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0-40 _{-20 0 20 40 60 80 100 120}
TEMPERATURE (°C)
Switch Saturation
vs. Temperature
700
600
500
400
300
200
V_IN = 3.6V
100
I = 500mA
SW
0-40 _{-20 0 20 40 60 80 100 120}
TEMPERATURE (°C)
Maximum Duty Cycle
vs. Temperature
99
97
95
93
91
89
87
V_IN = 3.6V
85-40 _{-20 0 20 40 60 80 100 120}
TEMPERATURE (°C)
4
Micrel, Inc.
Feedback Voltage
vs. Temperature
1.30
1.28
1.26
1.24
1.22
1.20
1.18
1.16
1.14
1.12
1.10-40 _{-20 0 20 40 60 80 100 120}
TEMPERATURE (°C)
Switch Saturation
vs. Supply Voltage
300
250
200
150
100
50
0
2.5
I_SW = 500mA
4 5.5 7 8.5 10
SUPPLY VOLTAGE (V)
Frequency
vs. Temperature
1.4
1.3
1.2
1.1
1.0
0.9
0.8-40 _{-20 0 20 40 60 80 100 120}
TEMPERATURE (°C)
FB Pin Current
vs. Temperature
700
600
500
400
300
200
100
0-40 _{-20 0 20 40 60 80 100 120}
TEMPERATURE (°C)
April 2005