RT7272B
Switching Frequency vs. Temperature
Current Limit vs. Temperature
500
490
480
470
460
450
440
8
7
6
5
4
3
2
VIN = 4.5V
IN = 12V
V
VIN = 24V
VIN = 36V
VOUT = 3.3V, IOUT = 0.3A
50 75 100 125
VIN = 12V
100 125
-50
-25
0
25
-50
-25
0
25
50
75
Temperature (°C)
Temperature (°C)
Load Transient Response
Load Transient Response
VOUT
VOUT
(200mV/Div)
(200mV/Div)
IOUT
IOUT
(2A/Div)
(2A/Div)
VIN = 12V, VOUT = 3.3V, IOUT = 0.3A to 3A
VIN = 12V, VOUT = 3.3V, IOUT = 1.5A to 3A
Time (250μs/Div)
Time (250μs/Div)
Switching
Switching
VOUT
VOUT
(5mV/Div)
(5mV/Div)
VSW
VSW
(5V/Div)
(5V/Div)
IL
IL
(1A/Div)
(2A/Div)
VIN = 12V, VOUT = 3.3V, IOUT = 1.5A
VIN = 12V, VOUT = 3.3V, IOUT = 3A
Time (1μs/Div)
Time (1μs/Div)
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8
DS7272B-05 June 2015
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
