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| 型号： | MCP1702T-4002E/MB |
| 厂商： | Microchip Technology |
| 文件页数： | 13/26页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 4V .25A SOT89-3 |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 4V |
| 输入电压： | 最高 13.2V |
| 电压 - 压降（标准）： | 0.525V @ 250mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 250mA（最小） |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | TO-243AA |
| 供应商设备封装： | SOT-89-3 |
| 包装： | 标准包装 |
| 产品目录页面： | 667 (CN2011-ZH PDF) |
| 其它名称： | MCP1702T-4002E/MBDKR |
MCP1702
5.0
FUNCTIONAL DESCRIPTION
5.2
Output
The MCP1702 CMOS LDO linear regulator is intended
for applications that need the lowest current
consumption while maintaining output voltage
regulation. The operating continuous load range of the
MCP1702 is from 0 mA to 250 mA (V R ? 2.5V). The
input operating voltage range is from 2.7V to 13.2V,
making it capable of operating from two or more
alkaline cells or single and multiple Li-Ion cell batteries.
The maximum rated continuous output current for the
MCP1702 is 250 mA (V R ? 2.5V). For applications
where V R < 2.5V, the maximum output current is
200 mA.
A minimum output capacitance of 1.0 μF is required for
small signal stability in applications that have up to
250 mA output current capability. The capacitor type
can be ceramic, tantalum or aluminum electrolytic. The
5.1
Input
esr range on the output capacitor can range from 0 ? to
2.0 ? .
The input of the MCP1702 is connected to the source
of the P-Channel PMOS pass transistor. As with all
LDO circuits, a relatively low source impedance (10 ? )
is needed to prevent the input impedance from causing
the LDO to become unstable. The size and type of the
capacitor needed depends heavily on the input source
type (battery, power supply) and the output current
range of the application. For most applications (up to
100 mA), a 1 μF ceramic capacitor will be sufficient to
The output capacitor range for ceramic capacitors is
1 μF to 22 μF. Higher output capacitance values may
be used for tantalum and electrolytic capacitors. Higher
output capacitor values pull the pole of the LDO
transfer function inward that results in higher phase
shifts which in turn cause a lower crossover frequency.
The circuit designer should verify the stability by
applying line step and load step testing to their system
when using capacitance values greater than 22 μF.
ensure circuit stability. Larger values can be used to
improve circuit AC performance.
5.3
Output Rise Time
When powering up the internal reference output, the
typical output rise time of 500 μs is controlled to
prevent overshoot of the output voltage. There is also a
start-up delay time that ranges from 300 μs to 800 μs
based on loading. The start-up time is separate from
and precedes the Output Rise Time. The total output
delay is the Start-up Delay plus the Output Rise time.
? 2010 Microchip Technology Inc.
DS22008E-page 13
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP1702T-4101E/CB | 制造商:Microchip Technology Inc 功能描述:LDO REGULATOR - Tape and Reel |
| MCP1702T-4102E/CB | 功能描述:低压差稳压器 - LDO Low Iq 250mA LDO Vin 13.2V max Vout=4.1V 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 |
| MCP1702T-4702E/CB | 功能描述:低压差稳压器 - LDO Low Iq 250mA LDO Vin 13.2V max Vout=4.7V 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 |
| MCP1702T-5002E/CB | 功能描述:低压差稳压器 - LDO LDO w/ Low Quiescent 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 |
| MCP1702T-5002E/CB-CUT TAPE | 制造商:Microchip 功能描述:MCP1702 Series 250 mA 5.0 V LDO Positive Voltage Regulator - SOT-23-3 |
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