RT7255
Typical Operating Characteristics
Efficiency vs. Load Current
100
90
80
PWM
100
90
80
PSM
Efficiency vs. Load Current
Efficiency (%)
60
50
40
30
20
10
0
0
V
IN
= 9V
V
IN
= 12V
V
IN
= 17V
Efficiency (%)
70
V
IN
= 5V
70
60
50
40
30
20
10
V
IN
= 5V
V
IN
= 9V
V
IN
= 12V
V
IN
= 17V
V
OUT
= 1.2V
0.3
0.6
0.9
1.2
1.5
0
0.01
V
OUT
= 1.2V
0.1
1
10
Load Current (A)
Load Current (A)
Referecnce Voltage vs. Input Voltage
0.610
PWM
0.608
0.610
PWM
Reference vs. Temperature
Referecnec Voltage(V)
0.605
0.603
0.600
0.598
0.595
0.593
V
IN
= 4.5V to 18V, V
OUT
= 1.2V, I
OUT
= 0A
0.590
4.5
6.5
8.5
10.5
12.5
14.5
16.5
18.5
Reference Voltage (V)
0.605
V
IN
= 18V
0.600
V
IN
= 12V
V
IN
= 9V
V
IN
= 4.5V
0.595
V
IN
= 4.5V to 18V, V
OUT
= 1.2V, I
OUT
= 0A
0.590
-50
-25
0
25
50
75
100
125
Input Voltage(V)
Temperature (°C)
Output Voltage vs. Load Current
1.230
PWM
1.222
1.234
1.250
Output Voltage vs. Load Current
PSM
Output Voltage (V)
V
IN
= 17V
1.214
V
IN
= 12V
Output Voltage (V)
1.218
1.206
V
IN
= 9V
1.198
V
IN
= 5V
V
IN
= 4.5V
V
OUT
= 1.2V
1.190
0
0.3
0.6
0.9
1.2
1.5
1.202
V
IN
= 17V
V
IN
= 12V
V
IN
= 5V
V
OUT
= 1.2V
1.186
1.170
0
0.3
0.6
0.9
1.2
1.5
Load Current (A)
Load Current (A)
Copyright © 2017 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7255-01
November 2017
www.richtek.com
7
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
