RT7272B
Switching Frequency vs. Temperature
500
8
7
Current Limit vs. Temperature
Switching Frequency (kHz)
1
490
480
470
460
450
Current Limit (A)
6
5
4
3
V
IN
=
V
IN
=
V
IN
=
V
IN
=
4.5V
12V
24V
36V
V
OUT
= 3.3V, I
OUT
= 0.3A
440
-50
-25
0
25
50
75
100
125
2
-50
-25
0
25
50
75
V
IN
= 12V
100
125
Temperature (°C)
Temperature (°C)
Load Transient Response
Load Transient Response
V
OUT
(200mV/Div)
V
OUT
(200mV/Div)
I
OUT
(2A/Div)
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 0.3A to 3A
I
OUT
(2A/Div)
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 1.5A to 3A
Time (250μs/Div)
Time (250μs/Div)
Switching
V
OUT
(5mV/Div)
V
OUT
(5mV/Div)
Switching
V
SW
(5V/Div)
I
L
(1A/Div)
V
SW
(5V/Div)
I
L
(2A/Div)
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 1.5A
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 3A
Time (1μs/Div)
Time (1μs/Div)
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
8
DS7272B-01 January 2013
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
