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參數(shù)資料
| 型號(hào)： | AAT3215IJS-28-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 英文描述： | 150mA CMOS High Performance LDO |
| 中文描述： | 150mA的LDO穩(wěn)壓器的CMOS高性能 |
| 文件頁(yè)數(shù)： | 10/16頁(yè) |
| 文件大?。?/td> | 283K |
| 代理商： | AAT3215IJS-28-T1 |
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Applications Information
In applications where there is a possibility of V
OUT
exceeding V
IN
for brief amounts of time during nor-
mal operation, the use of a larger value C
IN
capaci-
tor is highly recommended. A larger value of C
IN
with respect to C
OUT
will effect a slower C
IN
decay
rate during shutdown, thus preventing V
OUT
from
exceeding V
IN
. In applications where there is a
greater danger of V
OUT
exceeding V
IN
for extended
periods of time, it is recommended to place a schot-
tky diode across V
IN
to V
OUT
(connecting the cath-
ode to V
IN
and anode to V
OUT
). The Schottky diode
forward voltage should be less than 0.45 volts.
Thermal Considerations and High
Output Current Applications
The AAT3215 is designed to deliver a continuous
output load current of 150mA under normal operat-
ing conditions.
The limiting characteristic for the maximum output
load current safe operating area is essentially
package power dissipation and the internal preset
thermal limit of the device. In order to obtain high
operating currents, careful device layout and circuit
operating conditions need to be taken into account.
The following discussions will assume the LDO reg-
ulator is mounted on a printed circuit board utilizing
the minimum recommended footprint as stated in
the layout considerations section of the document.
At any given ambient temperature (T
A
) the maxi-
mum package power dissipation can be deter-
mined by the following equation:
P
D(MAX)
= [T
J(MAX)
- T
A
] /
Θ
JA
Constants for the AAT3215 are T
J(MAX)
, the maxi-
mum junction temperature for the device which is
125°C and
Θ
JA
= 190°C/W, the package thermal
resistance. Typically, maximum conditions are cal-
culated at the maximum operating temperature
where T
A
= 85°C, under normal ambient conditions
T
A
= 25°C. Given T
A
= 85°, the maximum package
power dissipation is 211mW. At T
A
= 25°C°, the
maximum package power dissipation is 526mW.
The maximum continuous output current for the
AAT3215 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:
I
OUT(MAX)
< P
D(MAX)
/ (V
IN
- V
OUT
)
For example, if V
IN
= 5V, V
OUT
= 3V and T
A
= 25°,
I
OUT(MAX)
< 264mA. If the output load current were to
exceed 264mAor if the ambient temperature were to
increase, the internal die temperature will increase.
If the condition remained constant, the LDO regula-
tor thermal protection circuit will activate.
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
caused 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 AAT3215 set for
a 2.5 volt output:
From the discussion above, P
D(MAX)
was deter-
mined to equal 526mW at T
A
= 25°C.
V
OUT
= 2.5 volts
I
OUT
= 150mA
I
GND
= 150μA
V
IN(MAX)
=(526mW+(2.5Vx150mA))/(150mA +150μA)
V
IN(MAX)
= 6.00V
Thus, the AAT3215 can sustain a constant 2.5V
output at a 150mA load current as long as V
IN
is
≤
6.00V at an ambient temperature of 25°C. 6.0V is
the absolute maximum voltage where an AAT3215
would never be operated, thus at 25°C, the device
would not have any thermal concerns or opera-
tional V
IN(MAX)
limits.
This situation can be different at 85°C. The follow-
ing is an example for an AAT3215 set for a 2.5 volt
output at 85°C:
From the discussion above, P
D(MAX)
was deter-
mined to equal 211mW at T
A
= 85°C.
AAT3215
150mA CMOS High Performance LDO
10
3215.2002.03.0.91
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3215IJS-29-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:150mA CMOS High Performance LDO |
| AAT3215IJS-3.0-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:150mA CMOS High Performance LDO |
| AAT3215IJS-3.3-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:150mA CMOS High Performance LDO |
| AAT3215IJS-30-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:150mA CMOS High Performance LDO |
| AAT3215IJS-33-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:150mA CMOS High Performance LDO |
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