SPX1117M3-L 데이터 시트보기 (PDF) - Exar Corporation
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SPX1117M3-L Datasheet PDF : 11 Pages
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SPX1117
800mA Low Dropout Voltage Regulator
PRE-BIAS OUTPUT VOLTAGE START-UP
The SPX1117 is not intended for operations
requiring start-up into a pre-biased load.
Proper discharge of the output voltage is
recommended prior of turning on the device
through the application of the input voltage.
LAYOUT CONSIDERATIONS
Parasitic line resistance can degrade local
regulation. In order to avoid this, connect R1
directly to VOUT as illustrated in figure 25. For
the same reason R2 should be connected to
the negative side of the load.
Fig. 24: 5V Regulator with Shutdown
Fig. 21: Current Cource
Fig. 22:Typical Adjustable Regulator
Fig. 25: Recommended Connections for Best Results
PC Board
mm2
2500
2500
2500
2500
2500
1600
2500
2500
1600
900
900
Topside
Copper
mm2
Backside
Copper
mm2
2500
1250
950
2500
1800
600
1250
915
600
240
240
2500
2500
2500
0
0
1600
0
0
0
900
0
Table 1
Thermal
Resistance
Jct to amb.
°C/W
46
47
49
51
53
55
58
59
67
72
85
Fig. 23: Improving Ripple Rejection
© 2011 Exar Corporation
8/11
Rev. 2.1.0
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