RT7274/79/80/81
Typical Operating Characteristics
Efficiency vs. Output Current
Efficiency vs. Output Current
100
100
90
80
70
60
50
40
30
20
10
0
90
80
RT7274/80
70
60
50
40
30
20
10
0
RT7274/80
RT7279/81
RT7279/81
VIN = 12V, VOUT = 1.05V, IOUT = 0 to 2A
VIN = 12V, VOUT = 5V, IOUT = 0 to 2A
0.001
0.01
0.1
1
10
0.001
0.01
0.1
1
10
Output Current (A)
Output Current (A)
VFB Threshold Voltage vs. Temperature
Output Voltage vs. Input Voltage
0.780
0.775
0.770
0.765
0.760
0.755
0.750
0.745
0.740
1.08
1.07
1.06
1.05
1.04
1.03
1.02
1.01
1.00
RT7279
RT7274
RT7280
RT7281
VIN = 4.5V to 18V, VOUT = 1.05V, IOUT = 1A
-50
-25
0
25
50
75
100
125
4
6
8
10
12
14
16
18
Temperature (°C)
Input Voltage (V)
Output Voltage vs. Output Current
Output Voltage vs. Output Current
1.070
1.065
1.060
1.055
1.050
1.045
1.040
1.035
1.030
5.10
5.08
5.06
5.04
5.02
5.00
4.98
4.96
4.94
4.92
RT7274/80
RT7279/81
RT7279/81
RT7274/80
VIN = 12V, VOUT = 1.05V, IOUT = 0 to 2A
0.2 0.4 0.6 0.8 1.2 1.4 1.6 1.8
VIN = 12V, VOUT = 5V, IOUT = 0 to 2A
0.2 0.4 0.6 0.8 1.2 1.4 1.6 1.8 2
0
1
2
0
1
Output Current (A)
Output Current (A)
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12
DS7274/79/80/81-01 February 2013
RICHTEK [ RICHTEK TECHNOLOGY CORPORATION ]
