SPX1202 datasheet(5/12 Pages) SIPEX

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Mar3-07

SPX202 600 mA Low Dropout Linear Regulator

PC BOARD

TOPSIDE COPPER

BACKSIDE COPPER

THERMAL RESISTANCE

AREA mm2

JUNCTION TO AMBIENT

C/W

2500

1250

2500

950

2500

1800

1600

600

1600

2500

1250

2500

915

1600

600

900

240

900

240

Figure 8. 600mA Current Source

Figure 9. Typical Adjustable Regulator

LOAD

ADJ

SPX1202

V IN

OUT

4.7F

OUT

VREF

IOUT=

OUT

IADJ

SPX1202

VOUT

VIN

OUT = V REF (1+R 2 /R1) +IADJR 2

REF

50A

ADJ

4.7F +

tude of the output ripple will be independent of

the output voltage. If an ADJ-bypass capacitor

is not used, the output ripple will be proportional

to the ratio of the output voltage to the reference

voltage:

M = V

OUT/ V REF

Where M = multiplier for the ripple seen when

the ADJ pin is optimally bypassed.

REF=1.25V

Output Voltage

The output of the adjustable regulator can be set

to any voltage between 1.25V and 15V. The

value of V

OUT can be quickly approximated

using the formula. (Figure 9)

OUT=1.25 *(R1+ R 2)/R1.

A small correction to this formula is required

depending on the values of resistors R1 and R2,

sinceadjustablepincurrent (approx50A)flows

through R2. When I

ADJ is taken into account, the

formula becomes

OUT= V REF(1+ (R2/R1)) + IADJ* R 2,

where V

REF=1.25V.

TYPICAL APPLICATIONS

Table 1

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