RT7272A
Typical Operating Characteristics
Efficiency vs. Output Current
100
90
0.810
0.808
Reference Voltage vs. Input Voltage
Efficiency (%)
70
60
50
40
30
20
10
0
0
0.5
1
V
IN
=
V
IN
=
V
IN
=
V
IN
=
4.5V
12V
24V
36V
Reference Voltage (V)
V
OUT
= 3.3V
80
0.805
0.803
0.800
0.798
0.795
0.793
V
IN
= 4.5V to 36V, I
OUT
= 0A
0.790
1.5
2
2.5
3
2
6.75
11.5 16.25
21
25.75 30.5 35.25
40
Output Current (A)
Input Voltage (V)
Reference Voltage vs. Temperature
0.810
3.320
3.315
Output Voltage vs. Output Current
Reference Voltage (V)
Output Voltage (V)
0.805
3.310
3.305
3.300
3.295
0.800
0.795
V
IN
=
V
IN
=
V
IN
=
V
IN
=
4.5V
12V
24V
36V
V
OUT
= 3.3V, I
OUT
= 0A
V
IN
= 12V
V
IN
= 24V
V
IN
= 30V
V
OUT
= 3.3V
3.290
0
0.5
1
1.5
2
2.5
3
0.790
-50
-25
0
25
50
75
100
125
Temperature (°C)
Output Current (A)
Switching Frequency vs. Input Voltage
500
500
Switching Frequency vs. Temperature
Switching Frequency (kHz)
1
Switching Frequency (kHz)
1
490
490
480
470
460
450
440
480
470
460
V
OUT
= 3.3V, I
OUT
= 0A
450
4
8
12
16
20
24
28
32
36
-50
-25
V
IN
=
V
IN
=
V
IN
=
V
IN
=
0
36V
24V
12V
4.5V
25
V
OUT
= 3.3V, I
OUT
= 0A
50
75
100
125
Input Voltage (V)
Temperature (°C)
Copyright
©
2013 Richtek Technology Corporation. All rights reserved.
is a registered trademark of Richtek Technology Corporation.
DS7272A-01 January 2013
www.richtek.com
7
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
