G923 datasheet(8/9 Pages) INTERPOINT

8 / 9 page

Ver: 1.1

Jan 19, 2006

TEL: 886-3-5788833

http://www.gmt.com.tw

G923

Global Mixed-mode Technology Inc.

Layout Guide

An input capacitance of

≅ 1µF is required between the

G923 input pin and ground (the amount of the capaci-

tance may be increased without limit), This capacitor

must be located a distance of not more than 1cm from

the input and return to a clean analog ground.

Input capacitor can filter out the input voltage spike

caused by the surge current due to the inductive effect

of the package pin and the printed circuit board’s rout-

ing wire. Otherwise, the actual voltage at the IN pin

may exceed the absolute maximum rating.

The output capacitor also must be located a distance

of not more than 1cm from output to a clean analog

ground. Because it can filter out the output spike

caused by the surge current due to the inductive effect

of the package pin and the printed circuit board’s rout-

ing wire. Figure 6 is adjustable mode of G923 PCB

layout. Figure 7 is a PCB layout of G923 fixed mode.

Figure 4 Safe Operating Area

Safe Operating Area of G923 [ Power Diss ipation Limit]

100

150

200

0.0

0 .5

1.0

1.5

2.0

2.5

3.0

3.5

4.0

4.5

Input-Output Voltage Differential VIN-VOUT (V)

TA=25

℃

TA=55

℃

TA=85

℃

Maximum Recommended Outp ut Curren t

TA=25°C,Still Air

1oz Copper on SOT-23-5Pack age

Mounted on recommended mimimum footprint (RθJA=240°C/ W)

Maximum Power Dissipation of SOT-23-5

0.1

0.2

0.3

0.4

0.5

0.6

0.7

9 5

105

115

125

Amibent Temperature TA (°C)

St ill Air

1oz Copper on SOT-23-5 Pack age

Mount ed on rec omm end mim imum f oot print (RθJA=240°C/W

)

Note : VIN(m ax) <=5.5V

Figure 5 Power Dissipation vs. Tem perature

Figure 4 Safe O perating Area

Figure 6. Adjustable Mode

Figure 7. Fixed Mode

*Distance between pin & capacitor must no more than 1cm

Figure 3. Recomme nded Minimum Footprint

Amibent T emperature T A (°C)

Still Air

1oz copper on SOT-23-5 Package

Mounted on recommended foorprint (R?JA=240°C/W)

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