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參數(shù)資料
| 型號： | MCP1725 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 500 mA, Low Voltage, Low Quiescent Current LDO Regulator |
| 中文描述： | 500毫安，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> | 1000K |
| 代理商： | MCP1725 |
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MCP1725
DS22026A-page 22
2006 Microchip Technology Inc.
5.3.2
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 near around a junction temperature of
100°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 2x3 DFN
package, which is very important in this application.
5.3.3
MAXIMUM PACKAGE POWER
DISSIPATION AT 60°C AMBIENT
TEMPERATURE
From this table, you can see the difference in maximum
allowable power dissipation between the 2x3 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
= 38.8°C + 60.0°C
T
J
= 98.8°C
2x3 DFN (76° C/W R
θ
JA
):
P
D(MAX)
P
D(MAX)
SOIC8 (163°C/Watt R
θ
JA
):
P
D(MAX)
P
D(MAX)
=
=
(125°C – 60°C) / 76° C/W
0.855W
=
=
(125°C – 60°C)/ 163° C/W
0.399W
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 300ms,
C = 333.3E-09 *.300
C = 100E-09 μF (0.1 μF)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MCP1726 | 1A, Low Voltage, Low Quiescent Current LDO Regulator |
| MCP1727 | 1.5A, Low Voltage, Low Quiescent Current LDO Regulator |
| MCP1801 | 150 mA, High PSRR, Low Quiescent Current LDO |
| MCP1802 | 300 mA, High PSRR, Low Quiescent Current LDO |
| MCP1827T-1202EAB | 1.5A, Low Voltage, Low Quiescent Current LDO Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCP1725-0802E/MC | 功能描述:低壓差穩(wěn)壓器 - LDO 500mA CMOS LDO Vout=0.8V 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(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MCP1725-0802E/SN | 功能描述:低壓差穩(wěn)壓器 - LDO 500mA CMOS LDO Vout=0.8V 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(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MCP1725-1202E/MC | 功能描述:低壓差穩(wěn)壓器 - LDO 500mA CMOS LDO Vout=1.2V 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(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MCP1725-1202E/SN | 功能描述:低壓差穩(wěn)壓器 - LDO 500mA CMOS LDO Vout=1.2V 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(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MCP1725-1802E/MC | 功能描述:低壓差穩(wěn)壓器 - LDO 500mA CMOS LDO Vout=1.8V 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(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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