RT8251
Switching Frequency vs. Input Voltage
610
630
Switching Frequency vs. Temperature
Switching Frequenc (kHz)1
11
Switcing Frequency (kHz)1
600
590
580
570
560
610
590
V
IN
= 12V
570
550
530
V
IN
= 24V
V
OUT
= 3.3V, I
OUT
= 1A
550
4
6.5
9
11.5
14
16.5
19
21.5
24
V
OUT
= 3.3V, I
OUT
= 1A
510
-50
-25
0
25
50
75
100
125
Input Voltage (V)
Temperature (
°
C)
Current Limit vs. Duty Cycle
9.3
Output Ripple
V
OUT
(10mV/Div)
8.7
Peak Current (A)
8.1
7.5
V
SW
(10V/Div)
6.9
6.3
I
SW
(2A/Div)
0
10
20
30
40
50
60
70
80
90
100
V
IN
= 12V
V
OUT
= 3.3V
I
OUT
= 5A
5.7
Time (1μs/Div)
Duty Cycle (%)
Load Transient Response
V
IN
= 12V, V
OUT
= 3.3V
I
OUT
= 0A to 5A
Load Transient Response
V
IN
= 12V, V
OUT
= 3.3V
I
OUT
= 2.5A to 5A
V
OUT
(200mV/Div)
V
OUT
(200mV/Div)
I
OUT
(2A/Div)
Time (100μs/Div)
I
OUT
(2A/Div)
Time (100μs/Div)
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS8251-04 February 2013
www.richtek.com
7
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