RT2875A/B
Switching Frequency vs. Temperature
600
Current Limit vs. R
LIM
7
6
Switching Frequency (kHz)
1
580
560
540
520
500
480
460
440
420
400
-50
-25
0
25
50
75
100
125
Current Limit (A)
V
IN
= 4.5V
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
5
4
3
2
1
V
OUT
= 3.3V, I
OUT
= 0A
0
20
30
40
50
60
70
80
90
100
Ambient Temperature (°C)
R
LIM
(k
Ω
)
Current Limit vs. Temperature
8
7
2.0
1.8
1.6
Enable Voltage vs. Temperature
Enable_Rising
Enable Voltage (V)
Current limit (A)
6
5
4
3
1.4
1.2
1.0
0.8
0.6
0.4
Enable_Falling
V
IN
= 12V, V
OUT
= 3.3V, R
LIM
= 39kΩ
2
-50
-25
0
25
50
75
100
125
0.2
0.0
-50
-25
0
25
V
IN
= 12V, V
OUT
= 3.3V
50
75
100
125
Temperature (°C)
Temperature (°C)
UVLO vs. Temperature
4.7
4.6
4.5
4.4
4.3
4.2
4.1
4.0
3.9
3.8
3.7
3.6
3.5
3.4
3.3
3.2
3.1
3.0
-50
-25
0
Load Transient Response
Input Voltage (V)
Turn On
V
OUT
(200mV/Div)
Turn Off
V
IN
= 12V, V
OUT
= 3.3V
25
50
75
100
125
I
OUT
(2A/Div)
V
IN
= 12V, V
OUT
= 3.3V, I
OUT
= 0A to 3A
Time (250μs/Div)
Temperature (°C)
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS2875A/B-08 November 2018
www.richtek.com
9
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
