G914X datasheet(10/11 Pages) GMT

10 / 11 page

Ver: 1.8

Jul 24, 2007

TEL: 886-3-5788833

http://www.gmt.com.tw

G914X

Global Mixed-mode Technology Inc.

Layout Guide

An input capacitance of

≅ 1µF is required between the

G914X input pin and ground (the amount of the ca-

pacitance may be increased without limit), This ca-

pacitor 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 4 is G914X PCB recommended layout.

Figure 4. Fixed Mode

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

Recommended Minimum Footprint

0.1

0.2

0.3

0.4

0.5

0.6

0.7

105

115

125

Amibent Temperature TA (°C)

Still Air

1oz Copper on SOT-23-5 Package

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

Figure 3. Power Dissipation vs. Temperature

Figure 2. Safe Operating Area

100

150

200

250

300

350

400

0.1

0.4

0.7

1.0

1.3

1.6

1.9

2.2

Input-Output Voltage Differential VIN-VOUT (V)

Safe Operating Area [Power Dissipation Limit]

1oz Copper on SOT-23-5 Package

Mounted on recommended mimimum

footprint (RJA=240°C/W)

Still air

TA=85

TA=25°C

TA=55

°C

Maximum Recommended Output Current

Note: VIN(max) <= 5.5V

SOT-23-5

Maximum Power Dissipation of SOT-23-5

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