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| 型号： | MCP1727-2502E/MF |
| 厂商： | Microchip Technology |
| 文件页数： | 16/32页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.5V 1.5A 8DFN |
| 产品培训模块： | High Current LDOs |
| 标准包装： | 120 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.5V |
| 输入电压： | 最高 6V |
| 电压 - 压降（标准）： | 0.33V @ 1.5A |
| 稳压器数量： | 1 |
| 电流 - 输出： | 1.5A（最小） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-VDFN 裸露焊盘 |
| 供应商设备封装： | 8-DFN-EP（3x3） |
| 包装： | 管件 |
| 产品目录页面： | 665 (CN2011-ZH PDF) |
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MCP1727
4.0
DEVICE OVERVIEW
EQUATION 4-2:
R 1 = R 2 ? -------------------------------- ?
V ADJ
The MCP1727 is a high output current, Low Dropout
(LDO) voltage regulator with an adjustable delay
power-good output and shutdown control input. The
Where:
V OUT – V ADJ
? ?
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 MCP1727 only
draws a maximum of 220 μA of quiescent current.
V OUT
V ADJ
=
=
LDO Output Voltage
ADJ Pin Voltage
(typically 0.41V)
4.1
LDO Output Voltage
4.2
Output Current and Current
The MCP1727 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.
Limiting
The MCP1727 LDO is tested and ensured to supply a
minimum of 1.5A of output current. The MCP1727 has
4.1.1
ADJUST INPUT
no minimum output load, so the output load current can
go to 0 mA and the LDO will continue to regulate the
V OUT = V ADJ ? ------------------ ?
R 2
The adjustable version of the MCP1727 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.
MCP1727. 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:
R 1 + R 2
? ?
Where:
V OUT = LDO Output Voltage
output voltage to within tolerance.
The MCP1727 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 MCP1727 will
supply higher load currents of up to 3A. The MCP1727
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
V ADJ
=
ADJ Pin Voltage
(typically 0.41V)
perature Protection” for more information on
overtemperature shutdown.
4.3
Output Capacitor
V IN
C 1
4.7 μF
MCP1727-ADJ
1 V IN V OUT 8
2 V IN ADJ 7
3 SHDN C DELAY 6
V OUT
R 1
C2
1 μF
The MCP1727 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.
O ff
On
4 GND
PWRGD 5
C 3
1000 pF
R 2
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
FIGURE 4-1:
Typical adjustable output
practical. Ceramic materials X7R and X5R have low
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:
DS21999B-page 16
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
MCP1727 to improve dynamic performance and power
supply ripple rejection performance. A maximum of
22 μF is recommended. Aluminum-electrolytic
capacitors are not recommended for low-temperature
applications of ≤ 25°C.
? 2007 Microchip Technology Inc.
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| MCP1727-3002E/MF | 功能描述:低压差稳压器 - LDO 1.5A CMOS LDO 3.0V DFN8 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 |
| MCP1727-3002E/SN | 功能描述:低压差稳压器 - LDO 1.5A CMOS LDO 3.0V SOIC8 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 |
| MCP1727-3302E/MF | 功能描述:低压差稳压器 - LDO 1.5A CMOS LDO 3.3V DFN8 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 |
| MCP1727-3302E/SN | 功能描述:低压差稳压器 - LDO 1.5A Vout=3.3V Extended Temp 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 |
| MCP1727-5002E/MF | 功能描述:低压差稳压器 - LDO 1.5A CMOS LDO 5.0V DFN8 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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