参数资料
| 型号： | MIC5280YME TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/14页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO ADJ 25MA 8SOIC |
| 标准包装： | 2,500 |
| 稳压器拓扑结构： | 正，可调式 |
| 输出电压： | 1.22 V ~ 5 V |
| 输入电压： | 4.5 V ~ 120 V |
| 电压 - 压降（标准）： | 1.1V @ 25mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 25mA |
| 电流 - 限制（最小）： | 40mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm Width）裸露焊盘 |
| 供应商设备封装： | 8-SOIC-EP |
| 包装： | 带卷 (TR) |
Micrel, Inc.
Application Information
MIC5280 is a linear regulator with a wide operating
range of input voltage 4.5V to 120V. The input can go
down to –24V without any damage to the device. This
feature gives the advantage to use in harsh environment
applications such as remote keyless entry and telecom
applications.
Thermal Protection
MIC5280 has internal thermal shutdown to protect from
over dissipation and failure. When the junction
temperature exceeds +160°C, an internal thermal sensor
signals the shutdown logic to turn off the pass transistor
and allows the IC to cool. The thermal sensor turns the
pass transistor on again after the junction temperature
cools by 10°C. This results in a cycled output during
MIC5280
PSRR
Power Supply Rejection Ratio is the measure of a V OUT
signal caused by a signal on the V IN pin. The ratio of
V IN /V OUT in dB is PSRR. The MIC5280’s PSRR from 0Hz
to 1kHz exceeds 80dB.
Output Voltage Setting
For this adjustable regulator, V OUT is programmable from
1.22V to 5.0V. A 2.2μF or larger capacitor must be
connected to V OUT pin-to-ground to maintain stability.
This capacitor value can be increased without bound.
The V OUT capacitor can have an ESR of 0 ? . When V IN is
lower than V OUT , V OUT is not pulled low by V IN . A small
current, typically 4μA, will sink into V OUT pin.
The output voltage is controlled by the feedback
resistors (R1 and R2) and can be calculated as follows:
V OUT = V REF ? ?
+ 1 ?
continuous thermal overload conditions. The recovery
from thermal shutdown is smooth without any overshoot.
For continuous operation, do not exceed the maximum
? R 1
? R 2
?
?
R 1 = R 2 ? ? ? OUT ? 1 ? ?
junction temperature rating of +125°C.
Current Limit
MIC5280 has a current limit protection to protect it from
over loads. The recovery from current limit protection is
smooth without any overshoots. The output can be
shorted to GND for an indefinite period of time without
damage to the device. During a short circuit, the power
dissipated across the pass transistor can quickly heat
the device. When the die temperature reaches +160°C,
the MIC5280 shut down and automatically restart after
the die temperature cools by 10°C. This results in a
pulsed output operation.
CBYP Output when Enable is Low
When the Enable is low and the MIC5280 is disabled,
while V IN voltage is present, the CBYP pin voltage is
typically 4.5V, even for V IN as high as 120V. The Bypass
regulator although maintaining the Bypass voltage,
requires no current from V IN other than leakage current.
Bypass Capacitor
A 10μF capacitor should be connected from bypass pin
to ground to maintain stability of the bypass regulator.
The voltage rating of the capacitor must be 8V or higher.
Low ESR ceramic capacitors work well. Although a 1μF
capacitor maintains good AC power supply rejection,
higher capacitance values will enhance AC power supply
rejection.
V REF = 1.219V
The evaluation board is initially adjusted to 5V, but can
easily be modified by removing R1 and replacing it with
the value that yields the desired output voltage.
? V ?
? V REF ?
Ensure the output voltage selected does not exceed 5V.
Enable Pin
The voltage on enable pin EN of MIC5280 could vary
from –1V to 120V. So enable pin EN of MIC5280 can be
used in a different configuration as the application
dictates.
If the MIC5280 needs to be always enabled then simply
connect the EN pin to CBYP pin, as shown in Figure 1.
Then whenever V IN has a supply voltage output is
developed. Input can swing from –24V to 120V.
One can also connect EN pin through 100k ? resistor to
input as shown in Figure 2 to achieve the same result.
January 2009
10
M9999-012209-A
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| MIC5281-3.3YMM | 功能描述:线性稳压器 - 标准 120V/25mA Low Iq, High PSRR LDO RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MIC5281-3.3YMM TR | 功能描述:线性稳压器 - 标准 120V/25mA Low Iq, High PSRR LDO RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MIC5281-3.3YMME | 功能描述:线性稳压器 - 标准 120V/25mA Low Iq, High PSRR LDO RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MIC5281-3.3YMME TR | 功能描述:线性稳压器 - 标准 120V/25mA Low Iq, High PSRR LDO RoHS:否 制造商:STMicroelectronics 输出类型: 极性: 输出电压:1.8 V 输出电流:150 mA 负载调节: 最大输入电压:5.5 V 线路调整率: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SOT-323-5L |
| MIC5281-3.3YMME-TR | 功能描述:Linear Voltage Regulator IC Positive Fixed 1 Output 3.3V 25mA 8-MSOP-EP 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:有效 稳压器拓扑:正，固定式 电压 - 输出:3.3V 电流 - 输出:25mA 电压 - 跌落（典型值）:2V @ 25mA 稳压器数:1 电压 - 输入:6 V ~ 120 V 电流 - 限制（最小值）:30mA 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽）裸焊盘 供应商器件封装:8-MSOP-EP 标准包装:1 |
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