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| 型号： | MCP1790-5002E/DB |
| 厂商： | Microchip Technology |
| 文件页数： | 18/34页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 5V 70MA SOT-223-3 |
| 标准包装： | 78 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 5V |
| 输入电压： | 6 V ~ 30 V |
| 电压 - 压降（标准）： | 0.7V @ 70mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 70mA（最小） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-261-4，TO-261AA |
| 供应商设备封装： | SOT-223-3 |
| 包装： | 管件 |
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MCP1790/MCP1791
5.0
APPLICATION CIRCUITS/
ISSUES
EQUATION 5-2:
T J ( MAX ) = P TOTAL × R θ JA + T AMAX
5.1 Typical Application
The MCP1790/MCP1791 is most commonly used as a
voltage regulator. It is a high voltage input capability
and thermal protection make it ideal for automotive and
24V industrial applications.
T J(MAX)
P TOTAL
R θ JA
T AMAX
=
=
=
=
Maximum continuous junction
temperature
Total device power dissipation
Thermal resistance from junction
to ambient
Maximum ambient temperature
MCP1791
The maximum power dissipation capability for a
package can be calculated given the junction-to-
C OUT
V IN
24 VDC
5
1
1N4002
C IN
1 μF
Ceramic
2
+
3
4 5
PWRGD
10 k Ω V OUT
+
5V@70 mA
4.7 μF Ceramic
ambient thermal resistance and the maximum ambient
temperature for the application. The following equation
can be used to determine the package maximum
internal power dissipation.
EQUATION 5-3:
( T J ( MAX ) – T A ( MAX ) )
P D ( MAX ) = ---------------------------------------------------
FIGURE 5-1: Typical Application.
5.1.1 APPLICATION INPUT CONDITIONS
Package Type = SOT-223-5
Input Voltage Range = 8V to 24V
P D(MAX)
T J(MAX)
R θ JA
= Maximum device power
dissipation
= Maximum continuous junction
temperature
V IN maximum = 24V
V OUT typical = 5.0V
I OUT = 70 mA maximum
T A(MAX)
R θ JA
=
=
Maximum ambient temperature
Thermal resistance from junction
to ambient
5.2 Power Calculations
5.2.1 POWER DISSIPATION
The internal power dissipation of the MCP1790/
MCP1791 is a function of input voltage, output voltage
and output current. The power dissipation, as a result
of the quiescent current draw, is so low, it is
EQUATION 5-4:
T J ( RISE ) = P TOTAL × R θ JA
T J(RISE) = Rise in device junction
temperature over the ambient
temperature
insignificant (70.0 μA x V IN ). The following equation
can be used to calculate the internal power dissipation
of the LDO.
P TOTAL
R θ JA
=
=
Total device power dissipation
Thermal resistance from
junction-to-ambient
EQUATION 5-1:
P LDO = ( V IN ( MAX ) ) – V OUT ( MIN ) ) × I OUT ( MAX ) )
P LDO = LDO Pass device internal power
dissipation
EQUATION 5-5:
T J = T J ( RISE ) + T A
V IN(MAX)
V OUT(MIN)
=
=
Maximum input voltage
LDO minimum output voltage
T J
T J(RISE)
=
=
Junction Temperature
Rise in device junction
temperature over the ambient
The maximum continuous operating junction
temperature
temperature specified for the MCP1790/MCP1791 is
+125 ° C . To estimate the internal junction temperature
T A
=
Ambient temperature
of the MCP1790/MCP1791, the total internal power
dissipation is multiplied by the thermal resistance from
junction to ambient (R θ JA ). The thermal resistance
from junction to ambient for the SOT-223-5 package is
estimated at 62 ° C/W.
DS22075B-page 18
? 2010 Microchip Technology Inc.
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相关代理商/技术参数 |
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|---|---|
| MCP1790T-3002E/DB | 功能描述:低压差稳压器 - LDO HI VLTG LDO 50 mA 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 |
| MCP1790T-3002E/EB | 功能描述:低压差稳压器 - LDO HI VLTG LDO 50 mA 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 |
| MCP1790T-3302E/DB | 功能描述:低压差稳压器 - LDO HI VLTG LDO 50 mA 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 |
| MCP1790T-3302E/EB | 功能描述:低压差稳压器 - LDO HI VLTG LDO 50 mA 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 |
| MCP1790T-5002E/DB | 功能描述:低压差稳压器 - LDO HI VLTG LDO 50 mA 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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