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| 型号： | MCP1801T-0902I/OT |
| 厂商： | Microchip Technology |
| 文件页数： | 13/28页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 0.9V .15A SOT23-5 |
| 标准包装： | 3,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 0.9V |
| 输入电压： | 2 V ~ 10 V |
| 稳压器数量： | 1 |
| 电流 - 输出： | 150mA（最小） |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 供应商设备封装： | SOT-23-5 |
| 包装： | 带卷 (TR) |
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MCP1801
4.0
DETAILED DESCRIPTION
4.1
Output Regulation
4.4
Output Capacitor
A portion of the LDO output voltage is fed back to the
internal error amplifier and compared with the precision
internal bandgap reference. The error amplifier output
will adjust the amount of current that flows through the
P-Channel pass transistor, thus regulating the output
voltage to the desired value. Any changes in input
voltage or output current will cause the error amplifier
to respond and adjust the output voltage to the target
voltage (refer to Figure 4-1 ).
The MCP1801 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 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
4.2
Overcurrent
acceptable ESR range required. A typical 1 μF X7R
0805 capacitor has an ESR of 50 milli-ohms.
The MCP1801 internal circuitry monitors the amount of
current flowing through the P-Channel pass transistor.
In the event that the load current reaches the current
limiter level of 300 mA (typical), the current limiter
circuit will operate and the output voltage will drop. As
the output voltage drops, the internal current foldback
Larger LDO output capacitors can be used with the
MCP1801 to improve dynamic performance and power
supply ripple rejection performance. Aluminum-
electrolytic capacitors are not recommended for low
temperature applications of ?? 25°C.
circuit will further reduce the output voltage causing the
4.5
Input Capacitor
output current to decrease. When the output is shorted,
a typical output current of 50 mA flows.
Low input source impedance is necessary for the LDO
output to operate properly. When operating from
4.3
Shutdown
batteries, or in applications with long lead length
(> 10 inches) between the input source and the LDO,
The SHDN input is used to turn the LDO output voltage
on and off. When the SHDN input is at a logic-high
level, the LDO output voltage is enabled. When the
SHDN input is pulled to a logic-low level, the LDO
output voltage is disabled and the LDO enters a low
quiescent current shutdown state where the typical
quiescent current is 0.01 μA. The SHDN pin does not
have an internal pull-up or pull-down resistor.
Therefore, the SHDN pin must be pulled either high or
low to prevent the device from becoming unstable. The
internal device current will increase when the device is
operational and current flows through the pull-up or
pull-down resistor to the SHDN pin internal logic. The
SHDN pin internal logic is equivalent to an inverter
input.
? 2010 Microchip Technology Inc.
some input capacitance is recommended. A minimum
of 0.1 μF to 4.7 μF is recommended for most
applications.
For applications that have output step load
requirements, the input capacitance of the LDO is very
important. The input capacitance provides the LDO
with a good local low-impedance source to pull the
transient currents from in order to respond quickly to
the output load step. For good step response
performance, the input capacitor should be of
equivalent (or higher) value than the output capacitor.
The capacitor should be placed as close to the input of
the LDO as is practical. Larger input capacitors will also
help reduce any high-frequency noise on the input and
output of the LDO and reduce the effects of any
inductance that exists between the input source
voltage and the input capacitance of the LDO.
DS22051D-page 13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP1801T-1202I/OT | 功能描述:低压差稳压器 - LDO Hi PSRR 150 mA LDO Vin 10V maxVout 1.2V 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 |
| MCP1801T-1802I/OT | 功能描述:低压差稳压器 - LDO Hi PSRR 150 mA LDO Vin 10V maxVout 1.8V 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 |
| MCP1801T-2502E/OT | 制造商:Microchip Technology Inc 功能描述:HIGH PSRR 150 MA LDO, VIN 10V MAX, VOUT =2.5V SOT-23-5-TR - Tape and Reel |
| MCP1801T-2502I/OT | 功能描述:低压差稳压器 - LDO Hi PSRR 150 mA LDO Vin 10V maxVout 2.5V 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 |
| MCP1801T-3002E/OT | 制造商:Microchip Technology Inc 功能描述:HIGH PSRR 150 MA LDO, VIN 10V MAX,VOUT =3.0V SOT-23-5-TR - Tape and Reel |
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