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| 型號(hào)： | MCP1827-5002EAB |
| 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(yè)數(shù)： | 16/32頁(yè) |
| 文件大小： | 968K |
| 代理商： | MCP1827-5002EAB |
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MCP1827/MCP1827S
DS22001B-page 16
2006 Microchip Technology Inc.
4.0
DEVICE OVERVIEW
The MCP1827/MCP1827S is a high output current,
Low Dropout (LDO) voltage regulator. The low dropout
voltage of 330 mV typical at 1.5A of current makes it
ideal for battery-powered applications. Unlike other
high output current LDOs, the MCP1827/MCP1827S
only draws a maximum of 220 μA of quiescent current.
The MCP1827 has a shutdown control input and a
power good output.
4.1
LDO Output Voltage
The 5-pin MCP1827 LDO is available with either a fixed
output voltage or an adjustable output voltage. The
output voltage range is 0.8V to 5.0V for both versions.
The 3-pin MCP1827S LDO is available as a fixed
voltage device.
4.1.1
ADJUST INPUT
The adjustable version of the MCP1827 uses the ADJ
pin (pin 5) to get the output voltage feedback for output
voltage regulation. This allows the user to set the
output voltage of the device with two external resistors.
The nominal voltage for ADJ is 0.41V.
Figure 4-1 shows the adjustable version of the
MCP1827. Resistors R
1
and R
2
form the resistor
divider network necessary to set the output voltage.
With this configuration, the equation for setting V
OUT
is:
EQUATION 4-1:
FIGURE 4-1:
voltage application circuit.
Typical adjustable output
The allowable resistance value range for resistor R
2
is
from 10 k
Ω
to 200 k
Ω
. Solving the equation for R
1
yields the following equation:
EQUATION 4-2:
4.2
Output Current and Current
Limiting
The MCP1827/MCP1827S LDO is tested and ensured
to supply a minimum of 1.5A of output current. The
MCP1827/MCP1827S has no minimum output load, so
the output load current can go to 0 mA and the LDO will
continue to regulate the output voltage to within
tolerance.
The MCP1827/MCP1827S also incorporates an output
current limit. If the output voltage falls below 0.7V due
to an overload condition (usually represents a shorted
load condition), the output current is limited to 2.2A
(typical). If the overload condition is a soft overload, the
MCP1827/MCP1827S will supply higher load currents
of up to 3A. The MCP1827/MCP1827S should not be
operated in this condition continuously as it may result
in failure of the device. However, this does allow for
device usage in applications that have higher pulsed
load currents having an average output current value of
1.5A or less.
Output overload conditions may also result in an over-
temperature shutdown of the device. If the junction
temperature rises above 150°C, the LDO will shut
down the output voltage. See
Section 4.8 “Overtem-
perature Protection”
for more information on
overtemperature shutdown.
4.3
Output Capacitor
The MCP1827/MCP1827S requires a minimum output
capacitance of 1 μF for output voltage stability. Ceramic
capacitors are recommended because of their size,
cost and environmental robustness qualities.
Aluminum-electrolytic and tantalum capacitors can be
used on the LDO output as well. The Equivalent Series
Resistance (ESR) of the electrolytic output capacitor
must be no greater than 1 ohm. The output capacitor
should be located as close to the LDO output as is
practical. Ceramic materials X7R and X5R have low
temperature coefficients and are well within the
acceptable ESR range required. A typical 1 μF X7R
0805 capacitor has an ESR of 50 milli-ohms.
Larger LDO output capacitors can be used with the
MCP1827/MCP1827S
to
performance and power supply ripple rejection
performance. A maximum of 22 μF is recommended.
Aluminum-electrolytic capacitors are not recom-
mended for low-temperature applications of < -25°C.
improve
dynamic
V
OUT
V
ADJ
R
------------------
R
2
+
R
2
=
Where:
V
OUT
V
ADJ
=
=
LDO Output Voltage
ADJ Pin Voltage
(typically 0.41V)
SHDN
GND
ADJ
2
1 μF
V
OUT
4.7 μF
V
IN
On
Off
R
1
R
2
C
C2
MCP1827-ADJ
1
3
4
5
R
1
R
2
V
--------------------------------
V
–
V
ADJ
=
Where:
V
OUT
V
ADJ
=
=
LDO Output Voltage
ADJ Pin Voltage
(typically 0.41V)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MCP1827-5002EAT | 1.5A, Low Voltage, Low Quiescent Current LDO Regulator |
| MCP1827-5002EEB | 1.5A, Low Voltage, Low Quiescent Current LDO Regulator |
| MCP1827-5002EET | 1.5A, Low Voltage, Low Quiescent Current LDO Regulator |
| MCP1827S | 1.5A, Low Voltage, Low Quiescent Current LDO Regulator |
| MCP1827S-0802EAB | 1.5A, Low Voltage, Low Quiescent Current LDO Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MCP1827-ADJE/AT | 功能描述:低壓差穩(wěn)壓器 - LDO LDO 1.5A CMOS 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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MCP1827-ADJE/AT | 制造商:Microchip Technology Inc 功能描述:1.5A CMOS LDO Vout=5.0V Extended Temp |
| MCP1827-ADJE/ET | 功能描述:低壓差穩(wěn)壓器 - LDO LDO 1.5A CMOS 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(lèi)型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MCP1827-ADJE/ET | 制造商:Microchip Technology Inc 功能描述:; LEADED PROCESS COMPATIBLE:YES; PEAK RE |
| MCP1827S-0802E/AB | 功能描述:低壓差穩(wěn)壓器 - LDO LDO 1.5A CMOS 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(lèi)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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