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参数资料
| 型号： | MAS9124A3GC06 |
| 元件分类： | 固定正电压单路输出LDO稳压器 |
| 英文描述： | 2.5 V FIXED POSITIVE LDO REGULATOR, 0.32 V DROPOUT, PDSO5 |
| 封装： | ROHS COMPIANT, MO-193, TSOT-5 |
| 文件页数： | 12/14页 |
| 文件大小： | 404K |
| 代理商： | MAS9124A3GC06 |
DA9124.009
11 January 2005
7 (
14)
APPLICATION INFORMATION
Auto-Discharge Function
MAS9124 has a shutdown transistor that turns on,
when the device is disabled, and discharges the
output capacitor.
Calculating Maximum Power Dissipation
Maximum power dissipation of the package may
limit output current or input voltage, which can be
used, especially with the combination of low output
voltage and high input voltage.
The power dissipation can be calculated by using
the formula:
()
GND
IN
OUT
IN
d
I
*
V
I
*
V
P
+
=
It shall not exceed the maximum power dissipation,
allowed by the package:
JA
A
JMAX
dMAX
R
T
P
=
where TJMAX is maximum junction temperature
(TJMAX = 125°C), TA is ambient temperature and RJA
is junction-to-ambient thermal resistance of the
package.
When assumed that:
TA = +55°C, VOUT = 1.5 V, VIN = 5.0 V and used
package is SOT23-5 the equation yields:
W
0.366
C/W
191
C
55
C
125
PdMAX
=
°
°
=
from which can be calculated:
mA
105
V
P
I
OUT
IN
dMAX
OUTMAX
=
=
VIN * IGND is negligible and can be omitted.
Consequently, it can be seen that under these
conditions the average output current should not
exceed 105 mA.
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