參數(shù)資料
型號(hào)： MCP1801
廠商： Microchip Technology Inc.
英文描述： 150 mA, High PSRR, Low Quiescent Current LDO
中文描述： 150毫安高PSRR，低靜態(tài)電流低壓降穩(wěn)壓器
文件頁數(shù)： 15/24頁
文件大?。?/td> 283K
代理商： MCP1801
2007 Microchip Technology Inc.
DS22051A-page 15
MCP1801
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 SOT23 Can Dissipate in an
Application”,
(DS00792),
regarding this subject.
for
more
information
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 in the following table.
Maximum Package Power Dissipation at +25°C
Ambient Temperature
6.4
Voltage Reference
The MCP1801 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 MCP1801 LDO. The low cost, low quiescent
current and small ceramic output capacitor are all
advantages when using the MCP1801 as a voltage
reference.
FIGURE 6-2:
Voltage Reference.
Using the MCP1801 as a
6.5
Pulsed Load Applications
For some applications, there are pulsed load current
events that may exceed the specified 150 mA
maximum specification of the MCP1801. The internal
current limit of the MCP1801 will prevent high peak
load demands from causing non-recoverable damage.
The 150 mA rating is a maximum average continuous
rating. As long as the average current does not exceed
150 mA nor the max power dissipation of the packaged
device, pulsed higher load currents can be applied to
the MCP1801
.
The typical current limit for the
MCP1801 is 300 mA (T
A
+25°C).
Package
Package Type
=
Input Voltage
SOT-23-5
V
IN
= 2.4V to 5.0V
LDO Output Voltages and Currents
V
OUT
= 1.8V
I
OUT
= 50 mA
Maximum Ambient Temperature
T
A(MAX)
= +40°C
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
= (5.0V - (0.98 x 1.8V)) x 50 mA
P
LDO
= 161.8 milli-Watts
T
J(RISE)
= P
TOTAL
x Rq
JA
T
JRISE
= 161.8 milli-Watts x 256.0
°
C/Watt
T
JRISE
= 41.42
°
C
T
J
= T
JRISE
+ T
A(MAX)
T
J
= 81.42°C
SOT-23-5 (256°C/Watt = R
θ
JA
)
P
D(MAX)
= (85°C - 25°C) / 256°C/W
P
D(MAX)
= 234 milli-Watts
PIC
MCP1801
GND
V
IN
C
1 μF
C
OUT
1 μF
Bridge Sensor
V
OUT
V
REF
ADO
AD1
Ratio Metric Reference
25 μA Bias
Microcontroller
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP1801T-0902E/OT 制造商:Microchip Technology Inc 功能描述:HIGH PSRR 150 MA LDO, VIN 10V MAX, VOUT =0.9V SOT-23-5-TR - Tape and Reel
MCP1801T-0902I/OT 功能描述:低壓差穩(wěn)壓器 - LDO Hi PSRR 150 mA LDO Vin 10V maxVout 0.9V 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
MCP1801T-1202I/OT 功能描述:低壓差穩(wěn)壓器 - LDO Hi PSRR 150 mA LDO Vin 10V maxVout 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: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
MCP1801T-1802I/OT 功能描述:低壓差穩(wěn)壓器 - LDO Hi PSRR 150 mA LDO Vin 10V maxVout 1.8V 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
MCP1801T-2502E/OT 制造商:Microchip Technology Inc 功能描述:HIGH PSRR 150 MA LDO, VIN 10V MAX, VOUT =2.5V SOT-23-5-TR - Tape and Reel
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