TC2574 Datasheet, PDF (21/25 Pages) TelCom Semiconductor, Inc – 0.5A Step-Down Switching Regulator

0.5A Step-Down Switching Regulator
TC2574
TYPICAL CHARACTERISTICS (Circuit of Figure 2)
Figure 23. Normalized Output Voltage
1.0
0.8 VIN= 20V
0.6
ILOAD = 100mA
Normalized at TJ = 25°C
0.4
0.2
0
–0.2
–0.4
–0.6
–0.8
–1.0
–50 –25
0
25
60
75 100 125
TJ JUNCTION TEMPERATURE (°C)
Figure 24. Line Regulation
1.4
1.2 _{ILOAD = 100mA}
1.0 ^{TJ = 25°C}
0.8
0.6
3.3V , 5.0V and ADJ
0.4
0.2
0
12V
–0.2
–0.4
–0.6
0 5.0 10 15 20 25 30 35 40
VIN, INPUT VOLTAGE (V)
Figure 25. Dropout Voltage
2.0
L = 300µH
1.5
ILOAD = 500mA
1.0
ILoad _{= 100mA}
0.5
0
–50 –5
0
25
60
75 100 125
TJ JUNCTION TEMPERATURE (°C)
1.4
1.3
1.2
1.1
1.0
0.9
0.8
0.7
–50 –25
Figure 26. Current Limit
VIN = 25 V
0
25
60
75 100 125
TJ JUNCTION TEMPERATURE (°C)
Figure 27. Quiescent Current
20
18
VOUT = 5.0 V
Measured at
16
Ground Pin
TJ = 25°C
14
12
ILOAD = 500mA
10
8.0
ILOAD = 100mA
6.0
4.0
0 5.0 10 15 20 25 30 35 40
VIN _{INPUT VOLTAGE (V)}
Figure 28. Standby Quiescent Current
200
180
VON/OFF = 5.0 V
160
140
120
100
VIN = 40 V
80
60
40
VIN = 12 V
20
0
–50 –25
0
25
60
75 100 125
TJ JUNCTION TEMPERATURE (°C)
TC2574-1 1/6/00
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