RT7273
Buck 2
Efficiency vs. Load Current
Output Voltage vs. Load Current
100
90
80
70
60
50
40
30
20
10
0
1.800
1.795
1.790
1.785
1.780
LOWP = 0
LOWP = 0
VIN = 5V
VIN = 12V
VIN = 17V
VIN = 5V
VIN = 12V
VIN = 17V
VOUT = 1.8V
1.25 1.5 1.75 2
VOUT = 1.8V, L = 4.7μH, fS = 500kHz
0
-50
5
0.25 0.5
0.75
1
1.25 1.5
1.75
2
0
0.25 0.5
0.75
1
Load Current (A)
Load Current (A)
Reference Voltage vs. Temperature
Output Voltage vs. Input Voltage
0.810
0.805
0.800
0.795
0.790
1.81
1.80
1.79
1.78
1.77
VIN = 17V
VIN = 12V
VIN = 5V
VOUT = 1.8V, IOUT = 0A
VOUT = 1.8V, IOUT = 1A
-25
0
25
50
75
100
125
5
7
9
11
13
15
17
Temperature (°C)
Input Voltage (V)
Current Limit vs. Input Voltage
Current Limit vs. Temperature
4.0
3.5
3.0
2.5
2.0
4.5
4.0
3.5
3.0
2.5
VIN = 5V
VIN = 12V
VIN = 17V
VOUT = 0V, RLIM2 = 82kΩ
11 13 15 17
VOUT = 0V, RLIM2 = 82kΩ
7
9
-50
-25
0
25
50
75
100
125
Input voltage (V)
Temperature (°C)
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12
DS7273-04 October 2014
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
