RT8048
Typical Operating Characteristics
Efficiency vs. Output Current
100
90
80
100
90
80
Efficiency vs. Output Current
Efficiency (%)
Efficiency (%)
70
60
50
40
30
20
10
0
0.1
V
IN
= 3.3V
V
IN
= 5V
70
60
50
40
30
20
V
OUT
= 1.2V, L = 1μH
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
10
0
0.1
0.2
0.3
0.4
V
IN
= 5V, V
OUT
= 3.3V, L = 1μH
0.5
0.6
0.7
0.8
0.9
1.0
Output Current (A)
Output Current (A)
Reference Voltage vs. Temperature
0.620
0.615
3.5
3.4
Frequency vs. Temperature
Reference Voltage (V)
0.610
0.605
0.600
0.595
0.590
Frequency (MHz)1
3.3
3.2
3.1
3.0
2.9
2.8
2.7
0.585
0.580
-50
-25
0
25
50
75
100
125
2.6
2.5
-50
-25
0
V
IN
= 5V, V
OUT
= 3.3V, I
OUT
= 0.3A
25
50
75
100
125
Temperature (°C)
Temperature (°C)
Current Limit vs. Input Voltage
2.6
2.3
1.9
2.1
Current Limit vs. Temperature
Current Limit (A)
Current Limit (A)
2.0
1.7
1.4
1.1
0.8
V
OUT
= 1.2
1.7
1.5
V
OUT
= 3.3
1.3
V
OUT
= 1.2V
0.5
2.5
3.0
3.5
4.0
4.5
5.0
5.5
1.1
-50
-25
0
25
50
75
V
IN
= 5V
100
125
Input Voltage (V)
Temperature (°C)
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6
DS8048-01 June 2011
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
