參數(shù)資料
型號(hào)： MCP1702
廠商： Microchip Technology Inc.
英文描述： 250 mA Low Quiescent Current LDO Regulator
中文描述： 250毫安低靜態(tài)電流LDO穩(wěn)壓器
文件頁(yè)數(shù)： 14/26頁(yè)
文件大?。?/td> 689K
代理商： MCP1702
MCP1702
DS22008B-page 14
2007 Microchip Technology Inc.
6.3
Voltage Regulator
Internal power dissipation, junction temperature rise,
junction temperature and maximum power dissipation
are calculated in the following example. The power
dissipation, as a result of ground current, is small
enough to be neglected.
6.3.1
POWER DISSIPATION EXAMPLE
Device Junction Temperature Rise
The internal junction temperature rise is a function of
internal power dissipation and the thermal resistance
from junction to ambient for the application. The thermal
resistance from junction to ambient (R
θ
JA
) is derived
from an EIA/JEDEC standard for measuring thermal
resistance for small surface mount packages. The EIA/
JEDEC specification is JESD51-7, “High Effective
Thermal Conductivity Test Board for Leaded Surface
Mount Packages”. The standard describes the test
method and board specifications for measuring the
thermal resistance from junction to ambient. The actual
thermal resistance for a particular application can vary
depending on many factors, such as copper area and
thickness. Refer to AN792,
“A Method to Determine
How Much Power a SOT-23 Can Dissipate in an
Application”
, (DS00792), for more information regarding
this subject.
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.
Maximum Package Power Dissipation at +40°C
Ambient Temperature
6.4
Voltage Reference
The MCP1702 can be used not only as a regulator, but
also as a low quiescent current voltage reference. In
many microcontroller applications, the initial accuracy
of the reference can be calibrated using production test
equipment or by using a ratio measurement. When the
initial accuracy is calibrated, the thermal stability and
line regulation tolerance are the only errors introduced
by the MCP1702 LDO. The low-cost, low quiescent
current and small ceramic output capacitor are all
advantages when using the MCP1702 as a voltage
reference.
FIGURE 6-2:
voltage reference.
Using the MCP1702 as a
Package
Package
Type
=
SOT-23A
Input Voltage
V
IN
=
2.8V to 3.2V
LDO Output Voltages and Currents
V
OUT
=
I
OUT
=
Maximum Ambient Temperature
T
A(MAX)
=
Internal Power Dissipation
Internal Power dissipation is the product of the LDO
output current times the voltage across the LDO
(V
IN
to V
OUT
).
P
LDO(MAX)
=
(V
IN(MAX)
- V
OUT(MIN)
) x
I
OUT(MAX)
P
LDO
=
(3.2V - (0.97 x 1.8V)) x 150 mA
P
LDO
=
218.1 milli-Watts
1.8V
150 mA
+40°C
T
J(RISE)
T
JRISE
T
JRISE
=
=
=
P
TOTAL
x Rq
JA
218.1 milli-Watts x 336.0
°
C/Watt
73.3
°
C
T
J
T
J
=
=
T
JRISE
+ T
A(MAX)
113.3°C
SOT-23 (336.0°C/Watt = R
θ
JA
)
P
D(MAX)
P
D(MAX)
SOT-89 (52°C/Watt = R
θ
JA
)
P
D(MAX)
P
D(MAX)
TO92 (131.9°C/Watt = R
θ
JA
)
P
D(MAX)
P
D(MAX)
=
=
(125°C - 40°C) / 336°C/W
253 milli-Watts
=
=
(125°C - 40°C) / 52°C/W
1.635 Watts
=
=
(125°C - 40°C) / 131.9°C/W
644 milli-Watts
PIC
MCP1702
V
IN
V
OUT
GND
C
IN
1 μF
C
1 μF
Bridge Sensor
V
REF
ADO
AD1
Ratio Metric Reference
2 μA Bias
Microcontroller
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP1702-1202E/CB 制造商:Microchip Technology Inc 功能描述:
MCP1702-1202E/TO 功能描述:低壓差穩(wěn)壓器 - LDO Low Iq 250mA LDO Vin 13.2V max 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(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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MCP1702-1502E/TO 功能描述:低壓差穩(wěn)壓器 - LDO Low Iq 250mA LDO Vin 13.2V max Vout=1.5V 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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MCP1702-1802E/TO 功能描述:低壓差穩(wěn)壓器 - LDO LDO w/ Low Quiescent 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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MCP1702-2502E/TO 功能描述:低壓差穩(wěn)壓器 - LDO LDO w/ Low Quiescent 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(lèi)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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