RT7257G
Typical Operating Characteristics
Efficiency vs. Output Current
100
90
80
Output Voltage vs. Input Voltage
3.35
3.34
Output Voltage (V)
V
OUT
= 3.3V
Efficiency (%)
70
60
50
40
30
20
10
0
0.01
0.1
V
IN
= 12V
V
IN
= 17V
3.33
3.32
3.31
3.30
3.29
3.28
3.27
3.26
3.25
1
10
V
IN
= 4.5V to 17V, V
OUT
= 3.3V, I
OUT
= 0.6A
4
6
8
10
12
14
16
18
Output Current (A)
Input Voltage (V)
Output Voltage vs. Temperature
3.45
3.43
3.41
Output Voltage vs. Output Current
3.8
3.7
3.6
Output Voltage (V)
Output Voltage (V)
3.39
3.37
3.35
3.33
3.31
3.29
3.27
3.25
-50
-25
0
25
50
75
100
125
3.5
3.4
3.3
3.2
3.1
3.0
V
IN
= 12V
V
IN
= 17V
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 0A
2.9
2.8
0
0.5
1
1.5
2
V
OUT
= 3.3V
2.5
3
Temperature (°C)
Output Current (A)
Switching Frequency vs. Input Voltage
800
800
Switching Frequency vs. Temperature
Switching Frequency (kHz)
1
Switching Frequency (kHz)
1
790
780
780
760
V
IN
= 12V
V
IN
= 5V
770
740
760
720
V
OUT
= 3.3V, I
OUT
= 1A
750
4
6
8
10
12
14
16
18
700
-50
-25
0
25
V
OUT
= 3.3V, I
OUT
= 1A
50
75
100
125
Input Voltage (V)
Temperature (°C)
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7257G-01
September 2012
www.richtek.com
7
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
