MIC2267 Datasheet, PDF (6/19 Pages) Micrel Semiconductor – Input Current Limiting Synchronous Buck Regulator

Micrel Inc.
Typical Characteristics (Continued)
100
95
90
85
80
75
70
65
60
55
50
0
Efficiency vs.
Output Current
VIN = 4.2V
VIN = 5.5V
VOUT = 3.3V
0.5
1
1.5
2
OUTPUT CURRENT (A)
Input Current Limit
vs. Temperature
0.90
0.85
0.80
0.75
0.70
0.65
0.60
ILIM @ 3.3Vin
0.55
ILIM @ 5Vin
VOUT = 1.8V
0.50
-50 -30 -10 10 30 50 70 90 110 130
TEMPERATURE (°C)
100
90
80
70
60
50
40
30
20
10
0
0
10000
Efficiency vs.
Output Current
V_IN = 3.3V
V_IN = 5.5V
V_OUT = 1.8V
0.5
1
1.5
2
OUTPUT CURRENT (A)
Current Limit
vs. RLIMIT
VIN = 5V
VOUT = 3.3V
1000
100
10
100
RLIMIT (kΩ)
1000
MIC2267
0.800
Input Current Limit
vs. Input Voltage
0.750
0.700
0.650
RLIM = 107K
V_FB = 0.5V
0.600
2.5 3 3.5 4 4.5 5 5.5 6
INPUT VOLTAGE (V)
Switching Frequency
vs. RFREQ
1800
1600
1400
1200
1000
800
600
400
200
VIN = 5V
TAMB = 25°C
0
0 50 100 150 200 250 300
RFREQ (kΩ)
January 2011
6
M9999-011711-A