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| 型号： | MCP1804T-3002I/OT |
| 厂商： | Microchip Technology |
| 文件页数： | 17/32页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3V .15A SOT23-5 |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3V |
| 输入电压： | 最高 28V |
| 电压 - 压降（标准）： | 1.3V @ 100mA |
| 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： | 标准包装 |
| 产品目录页面： | 668 (CN2011-ZH PDF) |
| 其它名称： | MCP1804T-3002I/OTDKR |
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MCP1804
4.0
DETAILED DESCRIPTION
4.4
Output Capacitor
4.1
Output Regulation
The MCP1804 requires a minimum output capacitance
of 0.1 μF to 1.0 μF for output voltage stability. Ceramic
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 ).
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.
Larger LDO output capacitors can be used with the
MCP1804 to improve dynamic performance and power
4.2
Overcurrent
supply ripple rejection performance. Aluminum-
electrolytic capacitors are not recommended for low
The MCP1804 internal circuitry monitors the amount of
temperature applications of < -25°C.
current flowing through the P-Channel pass transistor.
In the event that the load current reaches the current
4.5
Input Capacitor
limiter level of 200 mA (typical), the current limiter
circuit will operate and the output voltage will drop. As
the output voltage drops, the internal current foldback
circuit will further reduce the output voltage causing the
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
batteries, or in applications with long lead length
(> 10 inches) between the input source and the LDO,
some input capacitance is recommended. A minimum
of 0.1 μF to 1.0 μF is recommended for most
4.3
Shutdown
applications.
For applications that have output step load
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 pullup or pulldown 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 pullup or
pull-down resistor to the SHDN pin internal logic. The
SHDN pin internal logic is equivalent to an inverter
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.
input.
4.6
Thermal Shutdown
The MCP1804 thermal shutdown circuitry protects the
device when the internal junction temperature reaches
the typical thermal limit value of +150°C. The thermal
limit shuts off the output drive transistor. Device output
will resume when the internal junction temperature falls
below the thermal limit value by an amount equal to the
thermal limit hysteresis value of +25°C.
? 2011 Microchip Technology Inc.
DS22200C-page 17
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| MCP1804T-3302I/DB | 功能描述:低压差稳压器 - LDO 150mA LDO Vin 28V Vout =3.3V 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 |
| MCP1804T-3302I/MB | 功能描述:低压差稳压器 - LDO 150mA LDO Vin 28V Vout =3.3V 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 |
| MCP1804T-3302I/MT | 功能描述:低压差稳压器 - LDO 150mA LDO Vin 28V Vout =3.3V 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 |
| MCP1804T-3302I/OT | 功能描述:低压差稳压器 - LDO 150mA LDO Vin 28V Vout =3.3V 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 |
| MCP1804T-5002I/DB | 功能描述:低压差稳压器 - LDO 150mA LDO Vin 28V Vout =5.0V 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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