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參數(shù)資料
| 型號(hào)： | AAT3218IJS-1.25-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | 150mA MicroPower⑩ High Performance LDO |
| 中文描述： | 150mA的微功耗高性能的LDO⑩ |
| 文件頁(yè)數(shù)： | 13/18頁(yè) |
| 文件大?。?/td> | 384K |
| 代理商： | AAT3218IJS-1.25-T1 |
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AAT3218
150mA MicroPower High Performance LDO
3218.2006.04.1.8
13
High Peak Output Current Applications
Some applications require the LDO regulator to
operate at continuous nominal level with short dura-
tion, high-current peaks. The duty cycles for both
output current levels must be taken into account.
To do so, first calculate the power dissipation at the
nominal continuous level, then factor in the addi-
tional power dissipation due to the short duration,
high-current peaks.
For example, a 2.5V system using an AAT3218IGV-
2.5-T1 operates at a continuous 100mA load cur-
rent level and has short 150mA current peaks. The
current peak occurs for 378μs out of a 4.61ms peri-
od. It will be assumed the input voltage is 4.2V.
First, the current duty cycle in percent must be
calculated:
% Peak Duty Cycle: X/100 = 378μs/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)
= (4.2V - 2.5V)100mA + (4.2V x 150μA)
P
D(100mA)
= 170.6mW
P
D(91.8%D/C)
= %DC x P
D(100mA)
P
D(91.8%D/C)
= 0.918 x 170.6mW
P
D(91.8%D/C)
= 156.6mW
The power dissipation for a 100mA load occurring
for 91.8% of the duty cycle will be 156.6mW. Now
the power dissipation for the remaining 8.2% of the
duty cycle at the 150mA load can be calculated:
P
D(MAX)
= (V
IN
- V
OUT
)I
OUT
+ (V
IN
x I
GND
)
P
D(150mA)
= (4.2V - 2.5V)150mA + (4.2V x 150mA)
P
D(150mA)
= 255.6mW
P
D(8.2%D/C)
= %DC x P
D(150mA)
P
D(8.2%D/C)
= 0.082 x 255.6mW
P
D(8.2%D/C)
= 21mW
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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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AAT3218IJS-2.0-T1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:150mA MicroPower⑩ High Performance LDO |
| AAT3218IJS-2.3-T1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:150mA MicroPower⑩ High Performance LDO |
| AAT3218IJS-2.5-T1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:150mA MicroPower⑩ High Performance LDO |
| AAT3218IJS-2.6-T1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:150mA MicroPower⑩ High Performance LDO |
| AAT3218IJS-2.7-T1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:150mA MicroPower⑩ High Performance LDO |
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