RT7257G
Current Limit vs. Temperature
6.0
5.8
5.6
7
6
Current Limit vs. Input Voltage
Current Limit (A)
5.4
5.2
5.0
4.8
4.6
4.4
4.2
4.0
-50
-25
0
25
50
75
100
125
Current Limit (A)
5
4
3
2
1
V
OUT
= 1.2V
V
OUT
= 5V
V
IN
= 12V, V
OUT
= 3.3V
0
4
6
8
10
12
14
16
18
Temperature (°C)
Input Voltage (V)
Load Transient Response
Output Ripple Voltage
V
OUT
(100mV/Div)
V
SW
(10V/Div)
V
OUT
(10mV/Div)
I
OUT
(1A/Div)
I
L
(2A/Div)
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 1A to 3A
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 3A
Time (100μs/Div)
Time (1μs/Div)
Power On from V
IN
Power Off from V
IN
V
IN
(5V/Div)
V
OUT
(2V/Div)
I
L
(2A/Div)
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 3A
V
IN
(5V/Div)
V
OUT
(2V/Div)
I
L
(2A/Div)
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 3A
Time (5ms/Div)
Time (5ms/Div)
Copyright
©
2012 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
8
DS7257G-01
September 2012
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
