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)： 13/24頁
文件大?。?/td> 302K
代理商： MCP1703
2007 Microchip Technology Inc.
DS22049A-page 13
MCP1703
6.0
APPLICATION CIRCUITS &
ISSUES
6.1
Typical Application
The MCP1703 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 MCP1703 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 MCP1703 is +125
°
C
.
To
estimate the internal junction temperature of the
MCP1703, 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 =
Input Voltage Range =
V
IN
maximum =
V
OUT
typical =
SOT-23A
2.7V to 4.8V
4.8V
1.8V
50 mA maximum
I
OUT
=
MCP1703
GND
V
OUT
V
IN
C
IN
1 μF Ceramic
C
OUT
1 μF Ceramic
V
OUT
1.8V
V
IN
2.7V to 4.8V
I
OUT
50 mA
P
LDO
V
IN MAX
)
)
V
OUT MIN
)
–
(
)
I
OUT MAX
)
)
×
=
P
LDO
= LDO Pass device internal power dissipation
V
IN(MAX)
= Maximum input voltage
V
OUT(MIN)
= LDO minimum output voltage
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)
T
J(MAX)
=
=
Maximum device power dissipation
Maximum continuous junction
temperature
Maximum ambient temperature
Thermal resistance from junction-
to-ambient
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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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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