RT2857B
Typical Operating Characteristics
Efficiency vs. Output Current
100
90
80
Efficiency vs. Output Current
100
90
80
Efficiency (%)
60
50
40
30
20
10
0
0
1
2
3
4
5
6
Efficiency (%)
V
IN
= 12V, V
OUT
= 3.3V
70
70
60
50
40
30
20
10
0
0.001
0.01
0.1
V
IN
= 12V, V
OUT
= 3.3V
1
10
Output Current (A)
Output Current (A)
Output Voltage vs. Output Current
3.40
3.38
3.36
Output Voltage vs. Input Voltage
3.36
3.34
Output Voltage (V)
3.34
3.32
3.30
3.28
3.26
3.24
3.22
3.20
0
1
2
3
4
5
6
Output Voltage (V)
3.32
3.30
3.28
3.26
V
IN
= 12V, V
OUT
= 3.3V
3.24
4
6
V
IN
= 4.5V to 17V, V
OUT
= 3.3V, I
OUT
= 1A
8
10
12
14
16
18
Output Current (A)
Input Voltage (V)
Reference Voltage vs. Input Voltage
0.606
700
Switching Frequency vs. Temperature
Switching Frequency (kHz)
1
650
600
550
500
450
400
0.605
Reference Voltage (V)
0.604
0.603
0.602
0.601
0.600
0.599
0A
≤
I
OUT
≤
6A
0.598
4
6
8
10
12
14
16
18
350
-50
-25
0
25
50
R
OSC
= 100kΩ
75
100
125
Input Voltage (V)
Temperature (°C)
Copyright
©
2019 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS2857B-06
June 2019
www.richtek.com
9
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
