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參數(shù)資料
| 型號： | AAT3223IGU-2.7-T1 |
| 廠商： | Advanced Analogic Technologies, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | 3A Fixed Low Dropout Linear Regulator (LDO) |
| 中文描述： | 3A固定低壓差線性穩(wěn)壓器（LDO） |
| 文件頁數(shù)： | 14/17頁 |
| 文件大?。?/td> | 151K |
| 代理商： | AAT3223IGU-2.7-T1 |
AAT3223
250mA NanoPower LDO
Linear Regulator with Power-OK
14
3223.2005.04.1.4
+
High Peak Output Current Applications
Some applications require the LDO regulator to
operate at continuous nominal levels with short
duration, high-current peaks. The duty cycles for
both output current levels must be taken into
account. To do so, one would first need to calcu-
late the power dissipation at the nominal continu-
ous level, then factor in the addition power dissipa-
tion due to the short duration, high-current peaks.
For example, a 2.8V system using a AAT3223IGU-
2.8-T1 operates at a continuous 100mA load cur-
rent level and has short 250mA current peaks. The
current peak occurs for 378μs out of a 4.61ms
period. It will be assumed the input voltage is 5.0V.
First, the current duty cycle percentage must be
calculated:
% Peak Duty Cycle: X/100 = 378ms/4.61ms
% Peak Duty Cycle = 8.2%
The LDO regulator will be under the 100mA load
for 91.8% of the 4.61ms period and have 150mA
peaks occurring for 8.2% of the time. Next, the
continuous nominal power dissipation for the
100mA load should be determined and then multi-
plied by the duty cycle to conclude the actual
power dissipation over time.
P
D(MAX)
P
D(100mA)
P
D(100mA)
P
D(91.8%D/C)
= %DC x P
D(100mA)
P
D(91.8%D/C)
= 0.918 x 225.5mW
P
D(91.8%D/C)
= 207mW
The power dissipation for a 100mA load occurring
for 91.8% of the duty cycle will be 207mW. Now
the power dissipation for the remaining 8.2% of the
duty cycle at the 150mA load can be calculated:
= (V
IN
- V
OUT
)I
OUT
+ (V
IN
x I
GND
)
= (5.0V - 2.8V)100mA + (5.0V x 1.1μA)
= 225.5mW
P
D(MAX)
P
D(250mA)
P
D(250mA)
P
D(8.2%D/C)
= %DC x P
D(250mA)
P
D(8.2%D/C)
= 0.082 x 550mW
P
D(8.2%D/C)
= 45.1mW
= (V
IN
- V
OUT
)I
OUT
+ (V
IN
x I
GND
)
= (5.0V - 2.8V)250mA + (5.0V x 1.1μA)
= 550mW
0
0.5
1
1.5
2
2.5
3
3.5
4
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle (%)
V
100mA
150mA
200mA
250mA
300mA
Device Duty Cycle vs. V
DROP
(V
DROP
= 2.8V @ 85
°
C)
0
0.5
1
1.5
2
2.5
3
3.5
4
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle (%)
V
200mA
300mA
250mA
Device Duty Cycle vs. V
DROP
(V
DROP
= 2.8V @ 50
°
C)
Device Duty Cycle vs. V
DROP
(V
DROP
= 2.8V @ 25
°
C)
0
0.5
1
1.5
2
2.5
3
3.5
4
0
10
20
30
40
50
60
70
80
90
100
Duty Cycle (%)
V
250mA
300mA
相關PDF資料 |
PDF描述 |
|---|---|
| AAT3223IGU-2.8-T1 | 3A Fixed Low Dropout Linear Regulator (LDO) |
| AAT3223IGU-2.85-T1 | 3A Fixed Low Dropout Linear Regulator (LDO) |
| AAT3223IGU-3.0-T1 | 3A Fixed Low Dropout Linear Regulator (LDO) |
| AAT3223IGU-3.3-T1 | 3A Fixed Low Dropout Linear Regulator (LDO) |
| AAT3232 | 300mA CMOS Low Drop Out Linear Regulator |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3223IGU-3.0-T1 | 制造商:Skyworks Solutions Inc 功能描述:AAT3223 Series 3 V 250 mA NanoPower LDO Linear Regulator w/ Power OK - SOT-23-6 制造商:Skyworks Solutions Inc 功能描述:VOLTAGE REGULATOR |
| aat3223igu-3.3-db1 | 制造商:Skyworks Solutions Inc 功能描述:AAT3223 Series 250 mA NanoPower LDO Linear Regulator with Power OK Eval Board |
| AAT3223IGU3.3T1 | 制造商: 功能描述: 制造商:undefined 功能描述: |
| AAT3223IGU-3.3-T1 | 功能描述:低壓差穩(wěn)壓器 - LDO 250mA NanoPower LDO Linear Regulator RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:3.1 V 回動電壓（最大值）:160 mV 輸出電流:300 mA 負載調(diào)節(jié): 輸出端數(shù)量:1 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:DFN-4 |
| AAT3232 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:300mA CMOS Low Drop Out Linear Regulator |
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