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參數(shù)資料
| 型號(hào)： | AAT3220IGY-35-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 150mA NanoPower⑩ LDO Linear Regulator |
| 中文描述： | 150mA的NanoPower⑩LDO線性穩(wěn)壓器 |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 460K |
| 代理商： | AAT3220IGY-35-T1 |
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AAT3220
150mA NanoPower LDO Linear Regulator
3220.2001.
09.1.0
11
For example, if V
IN
= 5V, V
OUT
= 3V and T
A
= 25°,
I
OUT(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.
To figure what the maximum input voltage would be
for a given load current refer to the following equa-
tion. This calculation accounts for the total power
dissipation of the LDO Regulator, including that
cause by ground current.
P
D(MAX)
= (V
IN
- V
OUT
)I
OUT
+ (V
IN
x I
GND
)
This formula can be solved for V
IN
to determine the
maximum input voltage.
V
IN(MAX)
= (P
D(MAX)
+ (V
OUT
x I
OUT
)) / (I
OUT
+ I
GND
)
The following is an example for an AAT3220 set for
a 3.0 volt output:
From the discussion above, P
D(MAX)
was deter-
mined to equal 417mW at T
A
= 25°C.
V
OUT
= 3.0 volts
I
OUT
= 150mA
I
GND
= 1.1μA
V
IN(MAX)
=(500mW+(3.0Vx150mA))/(150mA+1.1
μ
A)
V
IN(MAX)
> 5.5V
Thus, the AAT3220 can sustain a constant 3.0V
output at a 150mA load current as long as V
IN
is
≤
5.5V at an ambient temperature of 25°C. 5.5V is
the maximum input operating voltage for the
AAT3220, thus at 25°C, the device would not have
any thermal concerns or operational V
IN(MAX)
limits.
This situation can be different at 85°C. The follow-
ing is an example for an AAT3220 set for a 3.0 volt
output at 85°C:
From the discussion above, P
D(MAX)
was deter-
mined to equal 200mW at T
A
= 85°C.
V
OUT
= 3.0 volts
I
OUT
= 150mA
I
GND
= 1.1μA
V
IN(MAX)
=(200mW+(3.0Vx150mA))/(150mA+1.1μA)
V
IN(MAX)
= 4.33V
Higher input to output voltage differentials can be
obtained with the AAT3220, while maintaining
device functions in the thermal safe operating area.
To accomplish this, the device thermal resistance
must be reduced by increasing the heat sink area
or by operating the LDO regulator in a duty cycled
mode.
For example, an application requires V
IN
= 5.0V
while V
OUT
= 3.0V at a 150mA load and T
A
= 85°C.
V
IN
is greater than 4.33V, which is the maximum
safe continuous input level for V
OUT
= 3.0V at
150mA for T
A
= 85°C. To maintain this high input
voltage and output current level, the LDO regulator
must be operated in a duty cycled mode. Refer to
the following calculation for duty cycle operation:
P
D(MAX)
is assumed to be 200mW
I
GND
= 1.1μA
I
OUT
= 150mA
V
IN
= 5.0 volts
V
OUT
= 3.0 volts
%DC = 100(P
D(MAX
/ ((V
IN
- V
OUT
)I
OUT
+ (V
IN
x I
GND
))
%DC=100(200mW/((5.0V-3.0V)150mA+(5.0Vx1.1μA))
%DC = 66.67%
For a 150mA output current and a 2.0 volt drop
across the AAT3220 at an ambient temperature of
85°C, the maximum on time duty cycle for the
device would be 66.67%.
The following family of curves shows the safe oper-
ating area for duty cycled operation from ambient
room temperature to the maximum operating level.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AAT3220IQY-1.8-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:150mA NanoPower⑩ LDO Linear Regulator |
| AAT3220IQY-18-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:150mA NanoPower⑩ LDO Linear Regulator |
| AAT3220IQY-2.0-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:150mA NanoPower⑩ LDO Linear Regulator |
| AAT3220IQY-2.3-T1 | 制造商:AAT 制造商全稱:AAT 功能描述:150mA NanoPower? LDO Linear Regulator |
| AAT3220IQY-2.4-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:150mA NanoPower⑩ LDO Linear Regulator |
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