參數(shù)資料
型號(hào)： TC1223-XXVCT
廠商： Microchip Technology Inc.
英文描述： 50mA and 100mA CMOS LDOs with Shutdown
中文描述： 為50mA和100mA的CMOS LDO的有關(guān)斷
文件頁(yè)數(shù)： 5/14頁(yè)
文件大小： 487K
代理商： TC1223-XXVCT
2002 Microchip Technology Inc.
DS21368B-page 5
TC1223/TC1224
4.0
THERMAL CONSIDERATIONS
4.1
Thermal Shutdown
Integrated
regulator off when die temperature exceeds 160°C.
The regulator remains off until the die temperature
drops to approximately 150°C.
thermal
protection
circuitry
shuts
the
4.2
Power Dissipation
The amount of power the regulator dissipates is
primarily a function of input and output voltage, and
output current. The following equation is used to
calculate worst case actual power dissipation:
EQUATION 4-1:
The maximum allowable power dissipation (Equation
4-2) is a function of the maximum ambient temperature
(T
A
MAX
), the maximum allowable die temperature
(T
J
MAX
) and the thermal resistance from junction-to-air
(
θ
JA
). The 5-Pin SOT-23A package has a
θ
JA
of
approximately 220°C/Watt.
EQUATION 4-2:
Equation 4-1 can be used in conjunction with Equation
4-2
to ensure regulator thermal operation is within
limits. For example:
Given:
V
IN
MAX
V
OUT
MIN
I
LOAD
MAX
= 40mA
T
J
MAX
T
A
MAX
Find: 1. Actual power dissipation
2. Maximum allowable dissipation
= 3.0V ±10%
= 2.7V – 2.5%
= 125°C
= 55°C
Actual power dissipation:
P
D
≈
(V
IN
MAX
– V
OUT
MIN
)I
LOAD
MAX
= [(3.0 x 1.1) – (2.7 x .975)]40 x 10
–3
= 26.7mW
Maximum allowable power dissipation:
In this example, the TC1223 dissipates a maximum of
26.7mW; below the allowable limit of 318mW. In a
similar manner, Equation 4-1 and Equation 4-2 can be
used to calculate maximum current and/or input
voltage limits.
4.3
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.
Where:
P
D
≈
(V
IN
MAX
– V
OUT
MIN
)I
LOAD
MAX
P
D
V
IN
MAX
V
OUT
MIN
I
LOAD
MAX
= Worst case actual power dissipation
= Maximum voltage on V
IN
= Minimum regulator output voltage
= Maximum output (load) current
P
D
MAX
= (T
J
MAX
– T
A
MAX
)
θ
JA
Where all terms are previously defined.
P
D
MAX
= (T
J
MAX
– T
A
MAX
)
θ
JA
= (125 – 55)
220
= 318mW
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TC1224 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:50mA and 100mA CMOS LDOs with Shutdown
TC1224-2.5VCTTR 功能描述:低壓差穩(wěn)壓器 - LDO 100mA LDO w/Shutdown 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(dòng)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
TC1224-2.6VCTTR 功能描述:低壓差穩(wěn)壓器 - LDO 100mA LDO w/Shutdown 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(dòng)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
TC1224-2.7VCTTR 功能描述:低壓差穩(wěn)壓器 - LDO 100mA LDO w/Shutdown 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(dòng)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
TC1224-2.85VCTTR 功能描述:低壓差穩(wěn)壓器 - LDO 100mA LDO w/Shutdown 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(dòng)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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