RT7257C
Typical Operating Characteristics
Efficiency vs. Load Current
100
90
80
3.34
3.33
Output Voltage vs. Input Voltage
Efficiency (%)
70
60
50
40
30
20
10
0
0.01
0.1
Output Voltage (V)
V
OUT
= 3.3V
V
IN
= 4.5V
V
IN
= 12V
V
IN
= 17V
3.32
3.31
3.30
3.29
3.28
3.27
V
IN
= 4.5V to 23V, V
OUT
= 3.3V, I
OUT
= 0.5A
3.26
4
6
8
10
12
14
16
18
1
10
Load Current (A)
Input Voltage (V)
Output Voltage vs. Temperature
3.34
3.33
3.380
Output Voltage vs. Load Current
Output Voltage (V)
3.31
3.30
3.29
3.28
3.27
Output Voltage (V)
3.32
3.354
3.328
3.302
V
IN
= 4.5V
V
IN
= 12V
V
IN
= 17V
3.276
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 0.5A
3.26
-50
-25
0
25
50
75
100
125
3.250
0
0.5
1
1.5
2
V
OUT
= 3.3V
2.5
3
Temperature (°C)
Load Current (A)
Switching Frequency vs. Input Voltage
380
370
Switching Frequency vs. Temperature
Switching Frequency (kHz)
1
360
350
340
330
320
310
Switching Frequency (kHz)
1
370
360
350
340
330
320
310
V
OUT
= 3.3V, I
OUT
= 0.5A
300
4.5
7
9.5
12
14.5
17
300
-50
-25
0
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 0.5A
25
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.
www.richtek.com
6
DS7257C-02
September 2012