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參數(shù)資料
| 型號： | MCP1727 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 1.5A, Low Voltage, Low Quiescent Current LDO Regulator |
| 中文描述： | 1.5安培的電流，低電壓，低靜態(tài)電流LDO穩(wěn)壓器 |
| 文件頁數(shù)： | 22/32頁 |
| 文件大?。?/td> | 678K |
| 代理商： | MCP1727 |
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MCP1727
DS21999B-page 22
2007 Microchip Technology Inc.
5.3.1.2
Junction Temperature Estimate
To estimate the internal junction temperature, the
calculated temperature rise is added to the ambient or
offset temperature. For this example, the worst-case
junction temperature is estimated below:
As you can see from the result, this application will be
operating very near the maximum operating junction
temperature of 125°C. The PCB layout for this
application is very important as it has a significant
impact on the junction-to-ambient thermal resistance
(R
θ
JA
) of the 3x3 DFN package, which is very important
in this application.
5.3.1.3
Maximum Package Power
Dissipation at 60°C Ambient
Temperature
From this table, you can see the difference in maximum
allowable power dissipation between the 3x3 DFN
package and the 8-pin SOIC package. This difference
is due to the exposed metal tab on the bottom of the
DFN package. The exposed tab of the DFN package
provides a very good thermal path from the die of the
LDO to the PCB. The PCB then acts like a heatsink,
providing more area to distribute the heat generated by
the LDO.
5.4
C
DELAY
Calculations (typical)
T
J
= T
JRISE
+ T
A(MAX)
T
J
= 63.14°C + 60.0°C
T
J
= 123.14°C
3x3DFN (41° C/W R
θ
JA
):
P
D(MAX)
= (125°C – 60°C) / 41° C/W
P
D(MAX)
= 1.585W
SOIC8 (150°C/Watt R
θ
JA
):
P
D(MAX)
= (125°C – 60°C)/ 150° C/W
P
D(MAX)
= 0.433W
C
I
T
Δ
V
-------
=
Where:
C
=
=
C
DELAY
Capacitor
C
DELAY
charging current,
140 nA typical.
time delay
C
DELAY
threshold voltage,
0.42V typical
I
Δ
T
Δ
V
=
=
C
I
T
Δ
V
-------
nA
0.42
V
Δ
T
-140
)
333.3
09
–
×
10
Δ
T
=
=
=
For a delay of 300 ms:
C = 333.3E-09 * .300
C = 100E-09uF (0.1
μ
F)
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|---|---|
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MCP1727-0802E/MF | 功能描述:低壓差穩(wěn)壓器 - LDO 1.5A CMOS LDO .8V DFN8 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 |
| MCP1727-0802E/SN | 功能描述:低壓差穩(wěn)壓器 - LDO 1.5A Vout=0.8V Extended Temp 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 |
| MCP1727-1202E/MF | 功能描述:低壓差穩(wěn)壓器 - LDO 1.5A CMOS LDO 1.2V DFN8 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 |
| MCP1727-1202E/SN | 功能描述:低壓差穩(wěn)壓器 - LDO 1.5A Vout=1.2V Extended Temp 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 |
| MCP1727-1802E/MF | 功能描述:低壓差穩(wěn)壓器 - LDO 1.5A CMOS LDO 1.8V DFN8 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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