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參數(shù)資料
| 型號： | MCP1702 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 250 mA Low Quiescent Current LDO Regulator |
| 中文描述： | 250毫安低靜態(tài)電流LDO穩(wěn)壓器 |
| 文件頁數(shù)： | 13/26頁 |
| 文件大?。?/td> | 689K |
| 代理商： | MCP1702 |
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2007 Microchip Technology Inc.
DS22008B-page 13
MCP1702
6.0
APPLICATION CIRCUITS AND
ISSUES
6.1
Typical Application
The MCP1702 is most commonly used as a voltage
regulator. It’s low quiescent current and low dropout
voltage makes 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 MCP1702 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
(2.0 μA x V
IN
). The following equation can be used to
calculate the internal power dissipation of the LDO.
EQUATION 6-1:
The
temperature specified for the MCP1702 is +125
°
C
.
To
estimate the internal junction temperature of the
MCP1702, 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-23A pin package is estimated at
336
°
C/W.
maximum
continuous
operating
junction
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 = SOT-23A
Input Voltage Range = 2.8V to 3.2V
V
IN
maximum = 3.2V
V
OUT
typical = 1.8V
I
OUT
= 150 mA maximum
MCP1702
GND
V
OUT
V
IN
C
IN
1 μF Ceramic
C
OUT
1 μF Ceramic
V
OUT
1.8V
V
IN
(2.8V to 3.2V)
I
OUT
150 mA
P
LDO
Where:
V
IN MAX
)
)
V
OUT MIN
)
–
(
)
I
OUT MAX
)
)
×
=
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
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 |
|---|---|
| MCP1702-1202E/CB | 制造商:Microchip Technology Inc 功能描述: |
| MCP1702-1202E/TO | 功能描述:低壓差穩(wěn)壓器 - LDO Low Iq 250mA LDO Vin 13.2V max Vout=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 |
| MCP1702-1502E/TO | 功能描述:低壓差穩(wěn)壓器 - LDO Low Iq 250mA LDO Vin 13.2V max 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 |
| MCP1702-1802E/TO | 功能描述:低壓差穩(wěn)壓器 - LDO LDO w/ Low Quiescent 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 |
| MCP1702-2502E/TO | 功能描述:低壓差穩(wěn)壓器 - LDO LDO w/ Low Quiescent 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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