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| 型号： | MCP1802T-1202I/OT |
| 厂商： | Microchip Technology |
| 文件页数： | 18/28页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 1.2V .26A SOT23-5 |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 1.2V |
| 输入电压： | 2 V ~ 10 V |
| 稳压器数量： | 1 |
| 电流 - 输出： | 260mA（最小） |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 标准包装 |
| 产品目录页面： | 667 (CN2011-ZH PDF) |
| 其它名称： | MCP1802T-1202I/OTDKR |
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MCP1802
6.3
Voltage Regulator
Junction Temperature Estimate
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
Package
Package Type = SOT-23-5
Input Voltage
V IN = 2.4V to 5.0V
LDO Output Voltages and Currents
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.
T J = T JRISE + T A(MAX)
T J = 81.42°C
Maximum Package Power Dissipation at +25°C
Ambient Temperature
SOT-23-5 (256°C/Watt = R ? JA )
P D(MAX) = (85°C - 25°C) / 256°C/W
P D(MAX) = 234 milli-Watts
V OUT = 1.8V
I OUT = 50 mA
6.4
Voltage Reference
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
The MCP1802 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 MCP1802 LDO. The low cost, low quiescent
current and small ceramic output capacitor are all
advantages when using the MCP1802 as a voltage
reference.
C OUT
1 μF
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 ? 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
25 μA Bias
C IN
1 μF
V IN
GND
Ratio Metric Reference
MCP1802 PIC ?
Microcontroller
V OUT V REF
ADO
AD1
test method and board specifications for measuring the
thermal resistance from junction to ambient. The actual
Bridge Sensor
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
FIGURE 6-2:
Voltage Reference.
Using the MCP1802 as a
How Much Power a SOT23 Can Dissipate in an
Application” , (DS00792), for more information
6.5
Pulsed Load Applications
regarding this subject.
T J(RISE) = P TOTAL x Rq JA
T JRISE = 161.8 milli-Watts x 256.0 ° C/Watt
T JRISE = 41.42 ° C
DS22053C-page 18
For some applications, there are pulsed load current
events that may exceed the specified 300 mA
maximum specification of the MCP1802. The internal
current limit of the MCP1802 will prevent high peak
load demands from causing non-recoverable damage.
The 300 mA rating is a maximum average continuous
rating. As long as the average current does not exceed
300 mA nor the max power dissipation of the packaged
device, pulsed higher load currents can be applied to
the MCP1802 . The typical current limit for the
MCP1802 is 380 mA (T A +25°C).
? 2010 Microchip Technology Inc.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP1802T-1802E/OT | 制造商:Microchip Technology Inc 功能描述:HIGH PSRR 300 MA LDO, VIN 10V MAX, VOUT =1.8V SOT-23-5-TR - Tape and Reel |
| MCP1802T-1802I/OT | 功能描述:低压差稳压器 - LDO Hi PSRR 300 mA LDO Vin 10V maxVout 1.8V RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MCP1802T-1802I/OT | 制造商:Microchip Technology Inc 功能描述:; Input Voltage Primary Max:10V; Output |
| MCP1802T-2502E/OT | 制造商:Microchip Technology Inc 功能描述:HIGH PSRR 300 MA LDO, VIN 10V MAX, VOUT =2.5V SOT-23-5-TR - Tape and Reel |
| MCP1802T-2502I/OT | 功能描述:低压差稳压器 - LDO Hi PSRR 300 mA LDO Vin 10V maxVout 2.5V RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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