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參數(shù)資料
| 型號(hào)： | MCP1802 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 300 mA, High PSRR, Low Quiescent Current LDO |
| 中文描述： | 300毫安，高PSRR，低靜態(tài)電流低壓降穩(wěn)壓器 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大小： | 292K |
| 代理商： | MCP1802 |
MCP1802
DS22053A-page 14
2007 Microchip Technology Inc.
6.0
APPLICATION CIRCUITS &
ISSUES
6.1
Typical Application
The MCP1802 is most commonly used as a voltage
regulator. Its low quiescent current and low dropout
voltage make it ideal for many battery-powered
applications.
FIGURE 6-1:
Typical Application Circuit.
6.1.1
APPLICATION INPUT CONDITIONS
6.2
Power Calculations
6.2.1
POWER DISSIPATION
The internal power dissipation of the MCP1802 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 insignificant
(25.0 μA x V
IN
). The following equation can be used to
calculate the internal power dissipation of the LDO.
EQUATION 6-1:
The maximum continuous operating temperature
specified for the MCP1802 is +85
°
C
.
To estimate the
internal junction temperature of the MCP1802, 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-23-5
package is estimated at 256
°
C/W.
EQUATION 6-2:
The maximum power dissipation capability for a
package can be calculated given the junction-to-
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 6-3:
EQUATION 6-4:
EQUATION 6-5:
Package Type =
Input Voltage Range =
V
IN
maximum =
V
OUT
typical =
SOT-23-5
2.4V to 5.0V
5.0V
1.8V
50 mA maximum
I
OUT
=
MCP1802
GND
V
OUT
V
IN
C
IN
1 μF
Ceramic
C
OUT
1 μF Ceramic
V
OUT
1.8V
V
IN
2.4V to 5.0V
I
OUT
50 mA
SHDN
NC
P
LDO
V
IN MAX
)
)
V
OUT MIN
)
–
(
)
I
OUT MAX
)
)
×
=
Where:
P
LDO
=
LDO Pass device internal power
dissipation
Maximum input voltage
LDO minimum output voltage
V
IN(MAX)
V
OUT(MIN)
=
=
T
J MAX
)
P
TOTAL
R
θ
JA
×
T
AMAX
+
=
Where:
T
J(MAX)
=
Maximum continuous junction
temperature
Total device power dissipation
Thermal resistance from
junction to ambient
Maximum ambient temperature
P
TOTAL
R
θ
JA
=
=
T
AMAX
=
P
D MAX
)
T
------------------------–
T
R
θ
JA
)
(
)
=
Where:
P
D(MAX)
=
Maximum device power
dissipation
Maximum continuous junction
temperature
Maximum ambient temperature
Thermal resistance from
junction to ambient
T
J(MAX)
=
T
A(MAX)
R
θ
JA
=
=
T
J RISE
)
P
D MAX
)
R
θ
JA
×
=
Where:
T
J(RISE)
=
Rise in device junction
temperature over the ambient
temperature
Maximum device power
dissipation
Thermal resistance from
junction to ambient
P
TOTAL
=
R
θ
JA
=
T
J
T
J RISE
)
T
A
+
=
Where:
T
J
=
=
Junction Temperature
Rise in device junction
temperature over the ambient
temperature
Ambient temperature
T
J(RISE)
T
A
=
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCP1802T-0902E/OT | 制造商:Microchip Technology Inc 功能描述:HIGH PSRR 300 MA LDO, VIN 10V MAX, VOUT =0.9V SOT-23-5-TR - Tape and Reel |
| MCP1802T-0902I/OT | 功能描述:低壓差穩(wěn)壓器 - LDO Hi PSRR 300 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 |
| MCP1802T-1202I/OT | 功能描述:低壓差穩(wěn)壓器 - LDO Hi PSRR 300 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 |
| 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:低壓差穩(wěn)壓器 - LDO Hi PSRR 300 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 |
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