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| 型号： | MCP1825S-3302E/AB |
| 厂商： | Microchip Technology |
| 文件页数： | 17/38页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3.3V .5A TO220-3 |
| 产品培训模块： | High Current LDOs |
| 标准包装： | 50 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3.3V |
| 输入电压： | 最高 6V |
| 电压 - 压降（标准）： | 0.21V @ 500mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 500mA（最小） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | TO-220-3 |
| 供应商设备封装： | TO-220-3 |
| 包装： | 管件 |
| 产品目录页面： | 666 (CN2011-ZH PDF) |
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MCP1825/MCP1825S
4.0
DEVICE OVERVIEW
EQUATION 4-2:
R 1 = R 2 ? -------------------------------- ?
? ?
The MCP1825/MCP1825S is a high output current,
Low Dropout (LDO) voltage regulator. The low dropout
voltage of 210 mV typical at 500 mA of current makes
Where:
V OUT – V ADJ
V ADJ
it ideal for battery-powered applications. Unlike other
high output current LDOs, the MCP1825/MCP1825S
only draws a maximum of 220 μA of quiescent current.
The MCP1825 has a shutdown control input and a
V OUT
V ADJ
=
=
LDO Output Voltage
ADJ Pin Voltage
(typically 0.41V)
power good output.
4.1
LDO Output Voltage
4.2
Output Current and Current
Limiting
The 5-pin MCP1825 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 MCP1825S LDO is available as a fixed
voltage device.
The MCP1825/MCP1825S LDO is tested and ensured
to supply a minimum of 500 mA of output current. The
MCP1825/MCP1825S 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
4.1.1
ADJUST INPUT
tolerance.
The MCP1825/MCP1825S also incorporates an output
The adjustable version of the MCP1825 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.
MCP1825. 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:
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
MCP1825/MCP1825S will supply higher load currents
of up to 1.5A. The MCP1825/MCP1825S 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
500 mA or less.
V OUT = V ADJ ? ------------------ ?
? ?
Where:
R 1 + R 2
R 2
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
V OUT
=
LDO Output Voltage
for more information on
V ADJ
=
ADJ Pin Voltage
overtemperature shutdown.
(typically 0.41V)
4.3
Output Capacitor
MCP1825-ADJ
V OUT
The MCP1825/MCP1825S requires a minimum output
capacitance of 1 μF for output voltage stability.
Ceramic capacitors are recommended because of their
O ff
On
SHDN
1 2 3 4 5
ADJ
R 1
C2
1 μF
size, cost and environmental robustness qualities.
Aluminum-electrolytic and tantalum capacitors can be
V IN
used on the LDO output as well. The Equivalent Series
Resistance (ESR) of the electrolytic output capacitor
C 1
4.7 μF
GND
R 2
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
FIGURE 4-1: Typical adjustable output
voltage application circuit.
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:
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
MCP1825/MCP1825S to improve dynamic
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.
? 2008 Microchip Technology Inc.
DS22056B-page 17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP1825S-5002E/AB | 功能描述:低压差稳压器 - LDO 500 mA CMOS LDO Vout 5.0V ETR RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MCP1825S-5002E/DB | 功能描述:低压差稳压器 - LDO 500 mA CMOS LDO Vout 5.0V ETR RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MCP1825S-5002E/EB | 功能描述:低压差稳压器 - LDO 500 mA CMOS LDO Vout 5.0V ETR RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MCP1825ST-0802E/DB | 功能描述:低压差稳压器 - LDO 500 mA CMOS LDO Vout 0.8V ETR RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
| MCP1825ST-0802E/EB | 功能描述:低压差稳压器 - LDO 500 mA CMOS LDO Vout 0.8V ETR RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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