RT8009
Typical Operating Characteristics
Efficiency vs. Load Current
100
90
80
Efficiency vs. Input Voltage
100
90
80
V
IN
= 3.3V
Efficiency (%)
Efficiency (%)
70
60
50
40
30
20
10
V
IN
= 5V
70
60
50
40
30
20
I
OUT
= 300mA
I
OUT
= 600mA
V
OUT
= 1.8V
0.11
0.21
0.31
0.41
0.51
0.61
10
0
0
0.01
V
OUT
= 1.8V
2.5
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Load Current (A)
Input Voltage (V)
Load Regulation
1.810
1.805
2.50
2.25
2.00
Current Limit vs. Input Voltage
Load Regulation (V)
Current Limit (A)
1.800
1.795
1.790
V
IN
= 5.5V
V
IN
= 3.3V
1.75
1.50
1.25
1.00
0.75
0.50
V
IN
= 2.5V
1.785
1.780
1.775
1.770
V
OUT
= 1.8V
0.1 0.15 0.2 0.25 0.3 0.35 0.4 0.45 0.5 0.55 0.6
0.25
0.00
V
OUT
= 1.8V
2.5
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
Load Current (A)
Input Voltage (V)
Frequency vs. Input Voltage
1.26
1.24
Frequency vs. Temperature
1.26
1.24
Frequency (MHz)
1.22
1.20
1.18
1.16
1.14
Frequency (MHz)
1.22
1.20
1.18
1.16
1.14
1.12
V
OUT
= 1.8V
2.5
2.8
3.1
3.4
3.7
4
4.3
4.6
4.9
5.2
5.5
V
IN
= 3.3V, V
OUT
= 1.8V
1.10
-50
-25
0
25
50
75
100
125
Input Voltage (V)
Temperature
(°C)
www.richtek.com
6
DS8009-03 March 2007
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
