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SPX1117T-L

800mA Low Dropout Voltage Regulator

Exar Corporation 

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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