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參數(shù)資料
| 型號(hào)： | MCP1701A |
| 廠商： | Microchip Technology Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 2??A Low-Dropout Positive Voltage Regulator |
| 中文描述： | 2μ低壓差正電壓穩(wěn)壓器 |
| 文件頁數(shù)： | 11/22頁 |
| 文件大?。?/td> | 531K |
| 代理商： | MCP1701A |
2007 Microchip Technology Inc.
DS21991C-page 11
MCP1701A
5.0
THERMAL CONSIDERATIONS
5.1
Power Dissipation
The amount of power dissipated internal to the LDO
linear regulator is the sum of the power dissipation
within the linear pass device (P-channel MOSFET) and
the quiescent current required to bias the internal
reference and error amplifier. The internal linear pass
device power dissipation is calculated as shown in
Equation 5-1
.
EQUATION 5-1:
The internal power dissipation, as a result of the bias
current for the LDO internal reference and error
amplifier, is calculated as shown in
Equation 5-2
.
EQUATION 5-2:
The total internal power dissipation is the sum of P
D
(pass device) and P
D
(bias).
EQUATION 5-3:
For the MCP1701A, the internal quiescent bias current
is so low (2 μA, typ.) that the P
D
(bias) term of the
power dissipation equation can be ignored. The
maximum power dissipation can be estimated by using
the maximum input voltage and the minimum output
voltage to obtain a maximum voltage differential
between input and output. The next step would be to
multiply the maximum voltage differential by the
maximum output current.
EQUATION 5-4:
To determine the junction temperature of the device, the
thermal resistance from junction-to-ambient must be
known. The 3-pin SOT-23A thermal resistance from
junction-to-air (R
θ
JA
) is estimated to be approximately
335°C/W. The SOT-89 R
θ
JA
is estimated to be
approximately 52°C/W when mounted on 1 square inch
of copper. The R
θ
JA
will vary with physical layout, airflow
and other application-specific conditions.
The device junction temperature is determined by
calculating the junction temperature rise above
ambient, then adding the rise to the ambient
temperature.
EQUATION 5-5: JUNCTION TEMPERATURE
– SOT-23A EXAMPLE:
EQUATION 5-6: JUNCTION TEMPERATURE
– SOT-89 EXAMPLE:
P
D
(Pass Device) = (V
IN
– V
OUT
) x I
OUT
P
D
(Bias) = V
IN
x I
GND
P
TOTAL
= P
D
(Pass Device) + P
D
(Bias)
P
D
= (V
INMAX
– V
OUTMIN
) x I
OUTMAX
Given:
V
IN
=
=
=
=
=
3.3V to 4.1V
3.0V ± 2%
1 mA to 100 mA
55°C
(4.1V – (3.0V x 0.98)) x 100 mA
V
OUT
I
OUT
T
AMAX
P
MAX
T
J
T
J
T
J
P
DMAX
116.0 milliwatts 335°C/W
93.9°C
R
θ
JA
T
A
+
×
=
=
=
55°C
+
T
J
T
J
116.0 milliwatts 52°C/W
61°C
55°C
+
=
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCP1701A-1802I/TO | 功能描述:低壓差穩(wěn)壓器 - LDO Low Iq 250mA 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(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 |
| MCP1701A-2502I/TO | 功能描述:低壓差穩(wěn)壓器 - LDO Low Iq 250mA 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(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 |
| MCP1701A-3002I/TO | 功能描述:低壓差穩(wěn)壓器 - LDO Low Iq 250mA 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(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 |
| MCP1701A-3302I/TO | 功能描述:低壓差穩(wěn)壓器 - LDO Low Iq 250mA 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(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 |
| MCP1701A-5002I/TO | 功能描述:低壓差穩(wěn)壓器 - LDO Low Iq 250mA 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(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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