參數(shù)資料
型號: MIC5311-GMBML
廠商: MICREL INC
元件分類: 基準電壓源/電流源
英文描述: LowQ Mode Dual 300mA LDO
中文描述: DUAL OUTPUT, FIXED POSITIVE LDO REGULATOR, PDSO10
封裝: 3 X 3 MM, MLF-10
文件頁數(shù): 10/11頁
文件大?。?/td> 344K
代理商: MIC5311-GMBML
Micrel, Inc.
MIC5311
February 2005
10
M9999-021105
(408) 955-1690
P
DTOTAL
= P
D LDO1
+ P
D LDO2
P
DTOTAL
= 360mW + 140mW
P
DTOTAL
= 500mW
The calculation shows that we are well below the
maximum allowable power dissipation of
1.03W
for a
60° ambient temperature.
After the maximum power dissipation has been
calculated, it is always a good idea to calculate the
maximum ambient temperature for a 125° junction
temperature. Calculating maximum ambient temperature
as follows:
T
A(max)
= T
J(max)
– (P
D
x
θ
JA
)
T
A(max)
= 125°C – (500mW x 63°C/W)
T
A(max)
= 93.5°C
For a full discussion of heat sinking and thermal effects
on voltage regulators, refer to the “Regulator Thermals”
section of
Micrel’s Designing with Low-Dropout Voltage
Regulators
handbook.
This information can be found on Micrel's website at:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
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