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參數(shù)資料
| 型號： | TC2185 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 50 mA, 100 mA, 150 mA CMOS LDOs with Shutdown and Reference Bypass |
| 中文描述： | 50毫安，100毫安，一百五十零毫安的CMOS低壓降穩(wěn)壓器具有關(guān)斷和參考旁路 |
| 文件頁數(shù)： | 11/18頁 |
| 文件大小： | 362K |
| 代理商： | TC2185 |
2003 Microchip Technology Inc.
DS21662C-page 11
TC2014/2015/2185
5.0
THERMAL CONSIDERATIONS
5.1
Power Dissipation
The amount of power the regulator dissipates is prima-
rily a function of input voltage, output voltage and
output current.
The following equation is used to calculate worst-case
power dissipation:
EQUATION
The maximum allowable power dissipation (P
DMAX
) is
a function of the maximum ambient temperature
(T
AMAX
), the maximum allowable die temperature
(T
JMAX
) (+125°C) and the thermal resistance from junc-
tion-to-air (
θ
JA
). The 5-Pin SOT-23A package has a
θ
JA
of approximately 220°C/Watt when mounted on a
typical two layer FR4 dielectric copper clad PC board.
EQUATION
The P
D
equation can be used in conjunction with the
P
DMAX
equation to ensure regulator thermal operation
is within limits. For example:
Actual power dissipation:
Maximum allowable power dissipation:
In this example, the TC2014 dissipates a maximum of
only 26.7 mW; far below the allowable limit of 318 mW.
In a similar manner, the P
D
equation and P
DMAX
equa-
tion can be used to calculate maximum current and/or
input voltage limits.
5.2
Layout Considerations
The primary path of heat conduction out of the package
is via the package leads. Therefore, layouts having a
ground plane, wide traces at the pads and wide power
supply bus lines combine to lower
θ
JA
and, therefore,
increase the maximum allowable power dissipation
limit.
PD
V
INMAX
V
OUTMIN
–
(
)
I
LMAX
≈
Where:
P
D
V
INMAX
V
OUTMIN
I
LMAX
= Worst-case actual power dissipation
= Maximum voltage on V
IN
= Minimum regulator output voltage
= Maximum output (load) current
Where all terms are previously defined.
P
DMAX
T
--------------------------------------
T
JA
–
=
Given:
V
INMAX
V
OUTMIN
I
LOADMAX
= 40 mA
T
JMAX
T
AMAX
= 3.0V +10%
= 2.7V – 2.5%
= +125°C
= +55°C
Find:
1. Actual power dissipation
2. Maximum allowable dissipation
P
D
V
INMAX
V
OUTMIN
–
(
)
I
LMAX
=
1.1
×
)
2.7
0.975
×
(
)
–
-----3.0
]
40
10
3
–
×
220
=
26.7mW
=
P
DMAX
T
------------------–
T
θ
JA
=
125
55
–
220
=
318mW
=
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| TC2185-1.8VCTTR | 功能描述:低壓差穩(wěn)壓器 - LDO 150mA LDO w/Shtdn 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 |
| TC2185-2.5VCTTR | 功能描述:低壓差穩(wěn)壓器 - LDO 150mA LDO 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 |
| TC2185-2.6VCTTR | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:50 mA, 100 mA, 150 mA CMOS LDOs |
| TC2185-2.7VCTTR | 功能描述:低壓差穩(wěn)壓器 - LDO 150mA LDO w/Shtdn 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 |
| TC2185-2.85VCTTR | 功能描述:低壓差穩(wěn)壓器 - LDO 150mA LDO w/Shtdn 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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