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AAT4298ITP-T1 参数 Datasheet PDF下载

AAT4298ITP-T1图片预览
型号: AAT4298ITP-T1
PDF下载: 下载PDF文件 查看货源
内容描述: 五/六通道推/拉I / O扩展器 [Five/Six Channel Push/Pull I/O Expander]
分类和应用:
文件页数/大小: 18 页 / 779 K
品牌: AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
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AAT4296/98  
Five/Six Channel Push/Pull I/O Expander  
The output capacitor has no specific capacitor type  
or ESR requirement. If desired, COUT may be  
increased to a value greater than 0.1µF without  
limit to accommodate any load transient condition  
without adversely affecting the device turn-on slew  
rate time.  
Constants for the AAT4296 and AAT4298 are max-  
imum junction temperature, TJ(MAX) = 125°C, and  
package thermal resistance, θJA = 120°C/W. Worst-  
case conditions are calculated at the maximum  
operating temperature, where TA = 85°C. Typical  
conditions are calculated under normal ambient  
conditions, where TA = 25°C.  
Thermal Considerations  
At 25°C ambient, the AAT4296 is capable of dissi-  
pating 440mW of power. If all five channels have  
5.0V output, the average current is 121mA per  
channel. The AAT4298 is capable of dissipating  
625mW of power. If all six channels have 5.0V out-  
put, the average current is 131.5mA per channel.  
The AAT4296 and AAT4298 are designed to deliv-  
er continuous output load currents. The limiting  
characteristic for maximum safe operating output  
load current is package power dissipation. In order  
to obtain high operating currents, careful device  
layout and circuit operating conditions need to be  
taken into account.  
At 85°C ambient, the AAT4296 is capable of dissi-  
pating 177.78mW of power. If all five channels  
have 5.0V output, the average current is 76.5mA  
per channel. The AAT4298 is capable of dissipat-  
ing 250mW of power. If all six channels have 5.0V  
output, the average current is 83mA per channel.  
At any given ambient temperature (TA), the maxi-  
mum package power dissipation can be deter-  
mined by the following equation:  
TJ(MAX) - TA  
PD(MAX)  
=
θJA  
Applications Circuit  
VCC Input  
OUT1  
OUT2  
OUT 1  
OUT 2  
VCC  
AAT4298  
OUT3  
OUT4  
OUT5  
OUT6  
OUT 3  
OUT 4  
OUT 5  
OUT 6  
EN/SET Input  
EN/SET  
GND  
C1*  
C2*  
C3*  
C4*  
C5*  
C6*  
Figure 4: Typical Application Diagram.  
*Use of capacitors on each output is optional.  
4296.2006.12.1.3  
13