Global Mixed-mode Technology Inc.
G923
Layout Guide
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.
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.
Figure 3. Recommended Minimum Footprint
Safe Operating Area of G923 [Power Dissipation Limit]
Maximum Power Dissipation of SOT-23-5
200
0.7
Still Air
Still Air
Maximum Recommended Output Current
1ozCopper on SOT-23-5 Package
0.6
0.5
0.4
0.3
0.2
1oz copper on SOT-23-5 Package
θ
)
Mounted on recomm end mim imumfootprint (R JA=240°C /W
?
°
Mounted on recommended foorprint (R JA=240 C/W)
150
TA=25
℃
100
TA=55
℃
TA=85
℃
TA=25°C,Still Air
1ozCopper on SOT-23-5Package
50
Figure 4 Safe Operating Area
Mounted on recommended mimimum footprint (R JA=240 C/ W)
θ
°
0.1
0
0
0.0
0 .5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
25
35
45
55
65
75
85
95 105 115 125
Input-Output Voltage Differential VIN-VOUT (V)
Note : VIN(m ax ) <=5.5V
Figure 4 Safe Operating Area
Amibent Temperature T ( C)
°
Amibent TemperatureATA ( C)
°
Figure 5 Power Dissipation vs. Temperature
Figure 6. Adjustable Mode
*Distance between pin & capacitor must no more than 1cm
Figure 7. Fixed Mode
*Distance between pin & capacitor must no more than 1cm
TEL: 886-3-5788833
http://www.gmt.com.tw
Ver: 1.1
Jan 19, 2006
8
CRANE [ Crane Aerospace & Electronics. ]
