RT8271
Switching Frequency vs. Input Voltage
1.35
Switching Frequency vs. Temperature
1.30
Switching Frequency (MHz)
1
1.30
1.25
1.20
1.15
1.10
Switching Frequency (MHz)
1
1.25
1.20
1.15
1.10
1.05
V
OUT
= 2.5V, I
OUT
= 0.3A
1.05
3
6
9
12
15
18
21
24
V
IN
= 12V, V
OUT
= 2.5V, I
OUT
= 0.3A
1.00
-50
-25
0
25
50
75
100
125
Input Voltage (V)
Temperature (°C)
Output Voltage vs. Input Voltage
2.529
2.527
Output Ripple
V
OUT
(5mV/Div)
Output Voltage (V)
2.525
2.523
2.521
2.519
V
SW
(10V/Div)
I
OUT
= 1A
2.517
4
6.5
9
11.5
14
16.5
19
21.5
24
I
L
(1A/Div)
Time (1μs/Div)
V
IN
= 12V
V
OUT
= 2.5V
I
OUT
= 2A
Input Voltage (V)
Load Transient Response
V
IN
= 12V, V
OUT
= 2.5V
I
OUT
= 0A to 2A
Load Transient Response
V
IN
= 12V, V
OUT
= 2.5V
I
OUT
= 1A to 2A
V
OUT
(50mV/Div)
V
OUT
(50mV/Div)
I
OUT
(1A/Div)
Time (100μs/Div)
I
OUT
(1A/Div)
Time (100μs/Div)
DS8271-02 March 2011
www.richtek.com
7
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
