參數(shù)資料
型號： MCP1703
廠商： Microchip Technology Inc.
英文描述： 250 mA, 16V, Low Quiescent Current
中文描述： 250毫安，16V的低靜態(tài)電流
文件頁數(shù)： 14/24頁
文件大?。?/td> 302K
代理商： MCP1703
MCP1703
DS22049A-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 Ther-
mal 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 depend-
ing on many factors, such as copper area and thick-
ness. Refer to AN792, “A Method to Determine How
Much Power a SOT23 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 MCP1703 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 MCP1703 LDO. The low-cost, low quiescent
current and small ceramic output capacitor are all
advantages when using the MCP1703 as a voltage
reference.
FIGURE 6-2:
Voltage Reference.
Using the MCP1703 as a
6.5
Pulsed Load Applications
For some applications, there are pulsed load current
events that may exceed the specified 250 mA
maximum specification of the MCP1703. The internal
current limit of the MCP1703 will prevent high peak
load demands from causing non-recoverable damage.
The 250 mA rating is a maximum average continuous
rating. As long as the average current does not exceed
250 mA, pulsed higher load currents can be applied to
the MCP1703
.
The typical current limit for the
MCP1703 is 500 mA (T
A
+25°C).
Package
Package Type = SOT-23A
Input Voltage
V
IN
= 2.7V to 4.8V
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
= (4.8V - (0.97 x 1.8V)) x 50 mA
P
LDO
= 152.7 milli-Watts
T
J(RISE)
= P
TOTAL
x Rq
JA
T
JRISE
= 152.7 milli-Watts x 336.0
°
C/Watt
T
JRISE
= 51.3
°
C
T
J
= T
JRISE
+ T
A(MAX)
T
J
= 91.3°C
SOT-23A (336.0°C/Watt = R
θ
JA
)
P
D(MAX)
= (125°C - 40°C) / 336°C/W
P
D(MAX)
= 253 milli-Watts
SOT-89 (75°C/Watt = R
θ
JA
)
P
D(MAX)
= (125°C - 40°C) / 75°C/W
P
D(MAX)
= 1.133 Watts
SOT-223 (62.9°C/Watt = R
θ
JA
)
P
D(MAX)
= (125°C - 40°C) / 62.9°C/W
P
D(MAX)
= 1.35 Watts
PIC
MCP1703
GND
V
IN
C
1 μF
C
OUT
1 μF
Bridge Sensor
V
OUT
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
MCP1703-1202E/DB 功能描述:低壓差穩(wěn)壓器 - LDO Low Iq 250mA LDO Vin 16V 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
MCP1703-1502E/DB 功能描述:低壓差穩(wěn)壓器 - LDO Low Iq 250mA LDO Vin 16Vmax 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
MCP1703-1802E/DB 功能描述:低壓差穩(wěn)壓器 - LDO Low Iq 250mA LDO Vin 16V 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
MCP1703-2502E/DB 功能描述:低壓差穩(wěn)壓器 - LDO Low Iq 250mA LDO Vin 16V maxVout 2.5V 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
MCP1703-2802E/DB 功能描述:低壓差穩(wěn)壓器 - LDO Low Iq 250mA LDO Vin 16V max Vout =2.8V 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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