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參數(shù)資料
| 型號： | MCP1727 |
| 廠商： | Microchip Technology Inc. |
| 英文描述： | 1.5A, Low Voltage, Low Quiescent Current LDO Regulator |
| 中文描述： | 1.5安培的電流，低電壓，低靜態(tài)電流LDO穩(wěn)壓器 |
| 文件頁數(shù)： | 20/32頁 |
| 文件大?。?/td> | 678K |
| 代理商： | MCP1727 |
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MCP1727
DS21999B-page 20
2007 Microchip Technology Inc.
5.0
APPLICATION CIRCUITS/
ISSUES
5.1
Typical Application
The MCP1727 is used for applications that require high
LDO output current and a power good output.
FIGURE 5-1:
Typical Application Circuit.
5.1.1
APPLICATION CONDITIONS
5.2
Power Calculations
5.2.1
POWER DISSIPATION
The internal power dissipation within the MCP1727 is a
function of input voltage, output voltage, output current
and quiescent current.
Equation 5-1
can be used to
calculate the internal power dissipation for the LDO.
EQUATION 5-1:
P
LDO
Where:
In addition to the LDO pass element power dissipation,
there is power dissipation within the MCP1727 as a
result of quiescent or ground current. The power
dissipation as a result of the ground current can be
calculated using the following equation:
EQUATION 5-2:
The total power dissipated within the MCP1727 is the
sum of the power dissipated in the LDO pass device
and the P(I
GND
) term. Because of the CMOS
construction, the typical I
GND
for the MCP1727 is
120 μA. Operating at a maximum of 3.465V results in a
power dissipation of 0.49 milli-Watts. For most
applications, this is small compared to the LDO pass
device power dissipation and can be neglected.
The
temperature specified for the MCP1727 is +125
°
C
.
To
estimate the internal junction temperature of the
MCP1727, the total internal power dissipation is
multiplied by the thermal resistance from junction to
ambient (R
θ
JA
) of the device. The thermal resistance
from junction to ambient for the 3x3 DFN package is
estimated at 41
°
C/W.
maximum
continuous
operating
junction
EQUATION 5-3:
Package Type = 3x3DFN8
Input Voltage Range = 3.3V ± 5%
V
IN
maximum = 3.465V
V
IN
minimum = 3.135V
V
DROPOUT (max)
= 0.525V
V
OUT
(typical) = 2.5V
I
OUT
= 1.5A maximum
P
DISS
(typical) = 1.2W
Temperature Rise = 49.2
°
C
V
IN
V
IN
SHDN
GND PWRGD
C
DELAY
Sense
V
OUT
1
2
3
4
5
6
7
8
10 μF
V
OUT
= 2.5V @ 1.5A
10 μF
V
IN
= 3.3V
On
Off
R
1
C
C
1000 pF
C
3
MCP1727-2.5
10k
Ω
PWRGD
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)
=
=
P
I GND
)
V
IN MAX
)
I
VIN
×
=
Where:
P
I(GND
=
Power dissipation due to the
quiescent current of the LDO
Maximum input voltage
Current flowing in the V
IN
pin
with no LDO output current
(LDO quiescent current)
V
IN(MAX)
=
=
I
VIN
T
J MAX
)
P
TOTAL
R
θ
JA
×
T
AMAX
+
=
T
J(MAX)
= Maximum continuous junction
temperature
P
TOTAL
= Total device power dissipation
R
θ
JA
= Thermal resistance from junction to
ambient
T
AMAX
= Maximum ambient temperature
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCP1727-0802E/MF | 功能描述:低壓差穩(wěn)壓器 - LDO 1.5A CMOS LDO .8V DFN8 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 |
| MCP1727-0802E/SN | 功能描述:低壓差穩(wěn)壓器 - LDO 1.5A Vout=0.8V Extended Temp 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 |
| MCP1727-1202E/MF | 功能描述:低壓差穩(wěn)壓器 - LDO 1.5A CMOS LDO 1.2V DFN8 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 |
| MCP1727-1202E/SN | 功能描述:低壓差穩(wěn)壓器 - LDO 1.5A Vout=1.2V Extended Temp 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 |
| MCP1727-1802E/MF | 功能描述:低壓差穩(wěn)壓器 - LDO 1.5A CMOS LDO 1.8V DFN8 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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