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參數(shù)資料
| 型號： | AAT3221IGV-2.6-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | 150mA NanoPower⑩ LDO Linear Regulator |
| 中文描述： | 150mA的NanoPower⑩LDO線性穩(wěn)壓器 |
| 文件頁數(shù)： | 13/18頁 |
| 文件大?。?/td> | 198K |
| 代理商： | AAT3221IGV-2.6-T1 |
AAT3221/2
150mA NanoPower LDO Linear Regulator
3221.2005.12.1.11
13
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 2.5V system using an AAT3221/
2IGV-2.5-T1 operates at a continuous 100mA load
current level and has short 150mA 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 then multiplied
by the duty cycle to conclude the actual power dis-
sipation over time.
P
D(MAX)
= (V
IN
- V
OUT
)I
OUT
+ (V
IN
x I
GND
)
P
D(100mA)
= (5.0V - 2.5V)100mA + (5.0V x 1.1mA)
P
D(100mA)
= 250mW
P
D(91.8%D/C)
= %DC x P
D(100mA)
P
D(91.8%D/C)
= 0.918 x 250mW
P
D(91.8%D/C)
= 229.5mW
Device Duty Cycle vs. V
DROP
(V
OUT
= 2.5V @ 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
200mA
150mA
100mA
Device Duty Cycle vs. V
DROP
(V
OUT
= 2.5V @ 50
°
°
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
200mA
150mA
Device Duty Cycle vs. V
DROP
(V
OUT
= 2.5V @ 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
200mA
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| AAT3221IGV-2.85-T1 | 150mA NanoPower⑩ LDO Linear Regulator |
| AAT3221IGV-2.8-T1 | 150mA NanoPower⑩ LDO Linear Regulator |
| AAT3221IGV-2.9-T1 | 150mA NanoPower⑩ LDO Linear Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3221IGV-27-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:150mA NanoPower⑩ LDO Linear Regulator |
| AAT3221IGV-28-2T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:150mA NanoPower⑩ LDO Linear Regulator |
| AAT3221IGV-285-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:150mA NanoPower⑩ LDO Linear Regulator |
| AAT3221IGV-28-T1 | 制造商:ANALOGICTECH 制造商全稱:Advanced Analogic Technologies 功能描述:150mA NanoPower⑩ LDO Linear Regulator |
| AAT3221IGV-3.0-T1 | 功能描述:低壓差穩(wěn)壓器 - LDO 150mA NanoPower LDO Linear Regulator RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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