RT2858B
Typical Operating Characteristics
Efficiency vs. Load Current
100
90
80
1.10
Output Voltage vs. Input Voltage
1.09
1.08
V
IN
= 4.5V
Efficiency (%)
70
60
50
40
30
20
10
0
0.001
0.01
0.1
Output Voltage (V)
1.07
1.06
1.05
1.04
1.03
1.02
V
IN
= 12V
V
IN
= 18V
V
OUT
= 1.05V
1
10
1.01
1.00
4
6
V
IN
= 4.5V to 18V, V
OUT
= 1.05V, I
OUT
= 0A
8
10
12
14
16
18
Load Current (A)
Input Voltage (V)
Output Voltage vs. Temperature
5.20
5.15
1.065
1.060
Output Voltage vs. Output Current
Output Voltage (V)
Output Voltage (V)
5.10
5.05
5.00
4.95
4.90
4.85
1.055
1.050
1.045
1.040
1.035
1.030
V
IN
= 18V
V
IN
= 12V
V
IN
= 12V, V
OUT
= 5V, I
OUT
= 0A
4.80
-50
-25
0
25
50
75
100
125
1.025
0
0.5
1
1.5
2
V
OUT
= 1.05V
2.5
3
Temperature (°C)
Output Current (A)
Frequency vs. Input Voltage
700
0.80
Reference Voltage vs. Temperature
660
Reference Voltage (V)
V
OUT
= 1.05V, I
OUT
= 0.3A
4
6
8
10
12
14
16
18
680
0.78
Frequency (kHz)1
0.76
640
0.74
620
0.72
600
0.70
-50
-25
0
25
V
IN
= 12V, V
OUT
= 0.765V
50
75
100
125
Input Voltage (V)
Temperature (°C)
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS2858B-00
September 2013
www.richtek.com
5
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
