Preliminary
Typical Operating Characteristics
Frequency vs. Temperature
700
680
0.804
0.803
RT9278
Reference Voltage vs. Temperature
Reference Voltage (V)
V
DD
= 3.3V
Frequency (kHz)
0.802
0.801
0.8
0.799
0.798
0.797
660
640
620
600
580
-40 -20
0
20
40
60
80 100 120 140 160 180
V
DD
= 3.3V
0.796
-40 -20
0
20
40
60
80 100 120 140 160 180
Temperature
(°C)
Temperature
(°C)
Efficiency vs. Output Current
Refer to Application Circuit Figure 3
100
90
80
Efficiency vs. Output Current
V
OUT
= 5.0V
90
80
V
OUT
= 3.3V
Efficiency (%)
60
50
40
30
20
10
0
1
10
100
Efficiency (%)
70
V
IN
V
IN
V
IN
V
IN
=
=
=
=
3.0V
2.5V
2.0V
1.5V
70
60
50
40
30
20
10
0
1
10
100
V
IN
V
IN
V
IN
V
IN
V
IN
V
IN
V
IN
=
=
=
=
=
=
=
4.5V
4.0V
3.5V
3.0V
2.5V
2.0V
1.5V
1000
1000
Output Current (mA)
Output Current (mA)
Input Voltage vs. Output Voltage
3.350
3.325
5.150
5.100
Input Voltage vs. Output Voltage
Output Voltage (V)
3.300
3.275
3.250
3.225
Output Voltage (V)
5.050
5.000
4.950
4.900
V
OUT
= 3.3V
3.200
1.6
1.8
2.0
2.2
2.4
2.6
2.8
3.0
4.850
V
OUT
= 5.0V
1.6
1.925 2.25 2.575
1.93
2.58
2.9
3.225 3.55 3.875
3.23
3.88
4.2
Input Voltage (V)
Input Voltage (V)
DS9278-04 August 2007
www.richtek.com
9
Refer to Application Circuit Figure 3
100
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
