RT6257A/B
Typical Operating Characteristics
Efficiency vs. Output Current
100
90
80
1.075
1.100
Output Voltage vs. Output Current
Efficiency (%)
70
60
50
40
30
20
10
0
0.001
0.01
V
IN
= 4.5V
V
IN
= 12V
V
IN
= 18V
Output Voltage (V)
1.050
1.025
1.000
0.975
0.950
V
OUT
= 1V,
L = 1.2μH (744325120)
0.1
1
10
V
IN
= 18V
V
IN
= 12V
V
IN
= 4.5V
V
OUT
= 1V
0
0.5
1
1.5
2
2.5
3
3.5
4
4.5
5
5.5
6
Output Current (A)
Output Current (A)
Efficiency vs. Output Current
100
5.3
Output Voltage vs. Output Current
Output Voltage (V)
90
Efficiency (%)
V
IN
= 8.5V
V
IN
= 12V
V
IN
= 18V
5.2
80
5.1
V
IN
= 18V
V
IN
= 12V
V
IN
= 8.5V
70
5.0
V
OUT
= 5V,
L = 3.3μH (74437368033)
60
0.001
4.9
0.01
0.1
1
10
0
0.5
1
1.5
2
2.5
3
3.5
4
V
OUT
= 5V
4.5
5
5.5
6
Output Current (A)
Output Current (A)
UVLO Threshold vs. Temperature
4.2
4.1
1.60
EN Threshold vs. Temperature
1.55
1.50
1.45
1.40
1.35
1.30
1.25
1.20
1.15
1.10
1.05
1.00
-50
-25
0
25
Rising
UVLO Threshold (V)
3.9
3.8
3.7
3.6
3.5
EN Threshold (V)
4.0
EN_H
Falling
EN_L
V
OUT
= 1V, I
OUT
= 0A
50
75
100
125
V
OUT
= 1V, I
OUT
= 1A
3.4
-50
-25
0
25
50
75
100
125
Temperature (°C)
Temperature (°C)
Copyright
©
2018 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
www.richtek.com
8
DS6257A/B-03 October 2018
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
