參數(shù)資料
型號： MCP1725
廠商： Microchip Technology Inc.
英文描述： 500 mA, Low Voltage, Low Quiescent Current LDO Regulator
中文描述： 500毫安，低電壓，低靜態(tài)電流LDO穩(wěn)壓器
文件頁數(shù)： 16/32頁
文件大?。?/td> 1000K
代理商： MCP1725
MCP1725
DS22026A-page 16
2006 Microchip Technology Inc.
4.0
DEVICE OVERVIEW
The MCP1725 is a high output current, Low Dropout
(LDO) voltage regulator with an adjustable delay
power-good output and shutdown control input. The
low dropout voltage of 210 mV typical at 0.5A of current
makes it ideal for battery-powered applications. Unlike
other high output current LDOs, the MCP1725 only
draws a maximum of 220 μA of quiescent current.
4.1
LDO Output Voltage
The MCP1725 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.
4.1.1
ADJUST INPUT
The adjustable version of the MCP1725 uses the ADJ
pin (pin 7) 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
MCP1725. 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 MCP1725 LDO is tested and ensured to supply a
minimum of 0.5A of output current. The MCP1725 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 MCP1725 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 1.2A (typical). If the
overload condition is a soft overload, the MCP1725 will
supply higher load currents of up to 1A. The MCP1725
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 0.5A 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.
“Overtemperature Protection”
for more information
on overtemperature shutdown.
See
Section 4.9
4.3
Output Capacitor
The MCP1725 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
MCP1725 to improve dynamic performance and power
supply ripple rejection performance. A maximum of
22 μF
is
recommended.
capacitors are not recommended for low-temperature
applications of < -25°C.
Aluminum-electrolytic
V
OUT
V
ADJ
R
------------------
R
2
+
R
2
=
Where:
V
OUT
V
ADJ
=
=
LDO Output Voltage
ADJ Pin Voltage
(typically 0.41V)
V
IN
SHDN
GND
PWRGD
C
DELAY
ADJ
V
OUT
1
2
3
4
5
6
7
8
1 μF
V
OUT
4.7 μF
V
IN
On
Off
V
IN
R
1
R
2
C
C2
1000 pF
C
3
MCP1725-ADJ
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
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MCP1725-0802E/MC 功能描述:低壓差穩(wěn)壓器 - LDO 500mA CMOS LDO Vout=0.8V 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(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
MCP1725-0802E/SN 功能描述:低壓差穩(wěn)壓器 - LDO 500mA CMOS LDO Vout=0.8V 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(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
MCP1725-1202E/MC 功能描述:低壓差穩(wěn)壓器 - LDO 500mA CMOS LDO 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
MCP1725-1202E/SN 功能描述:低壓差穩(wěn)壓器 - LDO 500mA CMOS LDO 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
MCP1725-1802E/MC 功能描述:低壓差穩(wěn)壓器 - LDO 500mA CMOS LDO Vout=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(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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