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參數(shù)資料
| 型號： | AAT3239ITS-1.5-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | 500mA MicroPower LDO |
| 中文描述： | 500mA的微功率LDO |
| 文件頁數(shù)： | 12/14頁 |
| 文件大小： | 290K |
| 代理商： | AAT3239ITS-1.5-T1 |
The following is an example for an AAT3239 set for
a 1.5 volt output:
From the discussion above, P
D(MAX)
was determined
to equal 1.11W at T
A
= 25°C.
Thus, the AAT3239 can sustain a constant 1.5V out-
put at a 411mA load current at an ambient tempera-
ture of 25°C. Higher input-to-output voltage differ-
entials can be obtained with the AAT3239, while
maintaining device functions within the thermal safe
operating area. To accomplish this, the device ther-
mal 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
= 4.2V
while V
OUT
= 1.5V at a 500mA load and T
A
= 25°C.
V
IN
is greater than 3.7V, which is the maximum safe
continuous input level for V
OUT
= 1.5V at 500mA for
T
A
= 25°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 follow-
ing calculation for duty cycle operation:
I
GND
= 125μA
I
OUT
= 500mA
P
D(MAX)
is assumed to be 1.1W
For a 500mAoutput current and a 2.7V drop across
the AAT3239 at an ambient temperature of 25°C,
the maximum on-time duty cycle for the device
would be 82%.
The following curves show the safe operating area
for duty-cycled operation from ambient room tem-
perature to the maximum operating level.
%DC =
V
IN
= 4.2V
V
OUT
= 1.5V
%DC = 82%
100(P
D(MAX)
)
(V
IN
- V
OUT
)I
OUT
+ V
IN
×
I
GND
%DC =
100(1.11W)
(4.2V - 1.5V)500mA + 4.2V
×
125
μ
A
I
OUT
=
V
OUT
= 1.5V
V
IN
= 4.2V
I
GND
= 125
μ
A
I
OUT(MAX)
= 411mA
1.11W - (4.2V
×
125
μ
A)
4.2 - 1.5
AAT3239
500mA MicroPower LDO
12
3239.2006.03.1.2
Device Duty Cycle vs. V
DROP
(V
OUT
= 1.5V @ 85
°
C)
0
0.5
1
1.5
2
2.5
3
3.5
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle (%)
V
450mA
400mA
350mA
300mA
Device Duty Cycle vs. V
DROP
(V
OUT
= 1.5V @ 25
°
C)
0
0.5
1
1.5
2
2.5
3
3.5
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle (%)
V
700mA
600mA
500mA
400mA
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AAT3239ITS-1.85-T1 | 500mA MicroPower LDO |
| AAT3239ITS-1.8-T1 | 500mA MicroPower LDO |
| AAT3239ITS-2.5-T1 | 500mA MicroPower LDO |
| AAT3239ITS-3.3-T1 | 500mA MicroPower LDO |
| AAT3242ITP-IN-T1 | 300mA/150mA Dual CMOS LDO Linear Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3239ITS-2.5-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:500mA MicroPower LDO |
| AAT3239ITS-3.3-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:500mA MicroPower LDO |
| AAT3242 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:300mA/150mA Dual CMOS LDO Linear Regulator |
| AAT3242_08 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:300mA/150mA Dual CMOS LDO Linear Regulator |
| AAT3242ITP-IG-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:300mA/150mA Dual CMOS LDO Linear Regulator |
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