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AAT3200IGY-2.5-T1 参数 Datasheet PDF下载

AAT3200IGY-2.5-T1图片预览
型号: AAT3200IGY-2.5-T1
PDF下载: 下载PDF文件 查看货源
内容描述: 能量总™ LDO线性稳压器 [OmniPower™ LDO Linear Regulator]
分类和应用: 稳压器
文件页数/大小: 16 页 / 173 K
品牌: AAT [ ADVANCED ANALOG TECHNOLOGY, INC. ]
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AAT3200  
OmniPower™ LDO Linear Regulator  
At any given ambient temperature (TA), the maxi-  
mum package power dissipation can be deter-  
mined by the following equation:  
This formula can be solved for VIN to determine the  
maximum input voltage.  
PD(MAX) + (VOUT × IOUT  
)
VIN(MAX)  
=
TJ(MAX) - TA  
θJA  
IOUT + IGND  
PD(MAX)  
=
Constants for the AAT3200 are TJ(MAX), the maxi-  
mum junction temperature for the device (125°C)  
and ΘJA = 200°C/W, the SC59 thermal resistance.  
Typically, maximum conditions are calculated at the  
maximum operating temperature where TA = 85°C,  
under normal ambient conditions TA = 25°C. Given  
TA = 85°C, the maximum package power dissipa-  
tion is 200mW. At TA = 25°C, the maximum pack-  
age power dissipation is 500mW.  
The following is an example for an AAT3200 set for  
a 3.0V output:  
From the discussion above, PD(MAX) was deter-  
mined to equal 417mW at TA = 25°C.  
VOUT  
IOUT  
IGND  
= 3.0V  
= 150mA  
The maximum continuous output current for the  
AAT3200 is a function of the package power dissi-  
pation and the input-to-output voltage drop across  
the LDO regulator. Refer to the following simple  
equation:  
= 20µA  
500mW + (3.0V × 150mA)  
VIN(MAX)  
=
150mA + 20µA  
VIN(MAX) > 5.5V  
PD(MAX)  
VIN - VOUT  
Thus, the AAT3200 can sustain a constant 3.0V  
output at a 150mA load current as long as VIN is ≤  
5.5V at an ambient temperature of 25°C. 5.5V is  
the maximum input operating voltage for the  
AAT3200, thus at 25°C, the device would not have  
any thermal concerns or operational VIN(MAX) limits.  
IOUT(MAX)  
<
For example, if VIN = 5V, VOUT = 3V, and TA = 25°C,  
IOUT(MAX) < 250mA. The output short-circuit protec-  
tion threshold is set between 150mA and 300mA.  
If the output load current were to exceed 250mA or  
if the ambient temperature were to increase, the  
internal die temperature will increase. If the condi-  
tion remained constant and the short-circuit protec-  
tion were not to activate, there would be a potential  
damage hazard to LDO regulator since the thermal  
protection circuit will only activate after a short-cir-  
cuit event occurs on the LDO regulator output.  
This situation can be different at 85°C. The follow-  
ing is an example for an AAT3200 set for a 3.0V  
output at 85°C:  
From the discussion above, PD(MAX) was deter-  
mined to equal 200mW at TA = 85°C.  
VOUT  
IOUT  
IGND  
= 3.0V  
To determine the maximum input voltage for a  
given load current, refer to the following equation.  
This calculation accounts for the total power dissi-  
pation of the LDO regulator, including that caused  
by ground current.  
= 150mA  
= 20µA  
200mW + (3.0V × 150mA)  
VIN(MAX)  
=
150mA + 20µA  
VIN(MAX) = 4.33V  
PD(MAX) = (VIN - VOUT)IOUT + (VIN × IGND  
)
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