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| 型號： | TC1263-2.8VOA |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 500 mA, Fixed-Output, CMOS LDO with Shutdown |
| 中文描述： | 500毫安，固定輸出，具有關(guān)斷功能的CMOS LDO穩(wěn)壓器 |
| 文件頁數(shù)： | 8/18頁 |
| 文件大?。?/td> | 209K |
| 代理商： | TC1263-2.8VOA |
TC1263
DS21374C-page 8
2005 Microchip Technology Inc.
5.0
THERMAL CONSIDERATIONS
5.1
Thermal Shutdown
Integrated thermal protection circuitry shuts the
regulator off when the die temperature exceeds 160°C.
The regulator remains off until the die temperature
drops to approximately 150°C.
5.2
Power Dissipation
The amount of power the regulator dissipates is
primarily a function of input and output voltage and out-
put current. The following equation is used to calculate
worst-case actual power dissipation:
EQUATION 5-1:
The
(Equation 5-2) is a function of the maximum ambient
temperature (T
AMAX
), the maximum allowable die
temperature (T
JMAX
) and the thermal resistance from
junction-to-air (
θ
JA
).
maximum
allowable
power
dissipation
EQUATION 5-2:
Table 5-1 and Table 5-2 show various values of
θ
JA
for
the TC1263 package types.
TABLE 5-1:
THERMAL RESISTANCE
GUIDELINES FOR TC1263 IN
8-PIN SOIC PACKAGE
TABLE 5-2:
THERMAL RESISTANCE
GUIDELINES FOR TC1263 IN
5-PIN DDPAK/TO-220
PACKAGE
Equation 5-1 can be used in conjunction with
Equation 5-2 to ensure regulator thermal operation is
within limits. For example:
Find:
1.
2.
Actual power dissipation:
≈
Actual power dissipation
Maximum allowable dissipation
Maximum allowable power dissipation:
In this example, the TC1263 dissipates a maximum of
260 mW below the allowable limit of 500 mW. In a
similar manner, Equation 5-1 and Equation 5-2 can be
used to calculate maximum current and/or input
voltage limits. For example, the maximum allowable
V
IN
is found by substituting the maximum allowable
power dissipation of 500 mW into Equation 5-1, from
which V
INMAX
= 4.6V.
Copper
Area
(Topside)*
Copper
Area
(Backside)
Board
Area
Thermal
Resistance
(θ
JA
)
60°C/W
60°C/W
68°C/W
74°C/W
2500 sq mm
1000 sq mm
225 sq mm
100 sq mm
*
Pin 2 is ground. Device is mounted on top-side.
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
Where:
V
INMAX
V
OUTMIN
I
LOADMAX
P
D
= Worst-case actual power dissipation
= Maximum voltage on V
IN
= Minimum regulator output voltage
= Maximum output (load) current
P
D
V
INMAX
V
OUTMIN
–
(
)
I
LOADMAX
=
Where:
V
INMAX
V
OUTMIN
I
LOADMAX
P
D
= Worst-case actual power dissipation
= Maximum voltage on V
IN
= Minimum regulator output voltage
= Maximum output (load) current
P
DMAX
T
------------------–
T
θ
JA
=
Copper
Area
(Topside)*
Copper
Area
(Backside)
Board
Area
Thermal
Resistance
(θ
JA
)
25°C/W
27°C/W
35°C/W
2500 sq mm
1000 sq mm
125 sq mm
*
Tab of device attached to top-side copper
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
2500 sq mm
Given:
V
INMAX
V
OUTMIN
I
LOADMAX
T
JMAX
T
AMAX
=
=
=
=
=
=
3.3V ± 10%
2.7V ± 0.5%
275 mA
125°C
95°C
60° C/W (SOIC)
θ
JA
P
D
P
D
P
D
V
INMAX
3.3
(
260 mW
V
OUTMIN
2.7
(
–
–
(
)
I
LOADMAX
.995
)
275
1.1
×
)
×
10
3
–
×
=
=
P
DMAX
T
--------------------------------------
T
JA
)
60
500 mW
–
=
P
DMAX
P
DMAX
-125
(
=
=
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PDF描述 |
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| TC1263-2.8VOATR | 500 mA, Fixed-Output, CMOS LDO with Shutdown |
| TC1263-3.0VAT | 500 mA, Fixed-Output, CMOS LDO with Shutdown |
| TC1263-3.0VET | 500 mA, Fixed-Output, CMOS LDO with Shutdown |
| TC1263-3.0VETTR | 500 mA, Fixed-Output, CMOS LDO with Shutdown |
| TC1263-3.0VOA | 500 mA, Fixed-Output, CMOS LDO with Shutdown |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC1263-3.0VAT | 功能描述:低壓差穩(wěn)壓器 - LDO 500mA Fixed Out Adj 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 |
| TC1263-3.0VET | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:500 mA, Fixed-Output, CMOS LDO with Shutdown |
| TC1263-3.0VETTR | 功能描述:低壓差穩(wěn)壓器 - LDO 500mA Fixed Out Adj 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 |
| TC1263-3.0VOA | 功能描述:低壓差穩(wěn)壓器 - LDO 500mA Fixed Out Adj 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 |
| TC1263-3.0VOATR | 功能描述:低壓差穩(wěn)壓器 - LDO 500mA Fixed Out Adj 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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