参数资料
| 型号： | MIC5231-2.75YM5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 6/7页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 2.75V 10MA SOT23-5 |
| 标准包装： | 1 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 2.75V |
| 输入电压： | 3.5 V ~ 12 V |
| 电压 - 压降（标准）： | 0.15V @ 10mA |
| 稳压器数量： | 1 |
| 电流 - 输出： | 10mA |
| 工作温度： | -40°C ~ 125°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： | 1098 (CN2011-ZH PDF) |
| 其它名称： | 576-2771-6 |
Micrel, Inc.
Application Information
Input Capacitor
A 0.1μF (or larger) capacitor should be placed from the
IN (supply input) to GND (ground) if there is more than
20cm of wire between IN and the ac filter capacitor or if
supplied from a battery.
MIC5231
Thermal Considerations
The MIC5231 is not intended for sourcing currents that
would cause a large power loss in the device, but since it
is not current limited, it is possible to source more than
the rated 10mA. At this point, it is important to ensure
that the die temperature does not exceed +125°C.
Power dissipation in the regulator is calculated as
Output Capacitors
The MIC5231 does not require an output capacitor for
follows:
P D = ( V IN ? V OUT ) I OUT + V IN ? I GND
T J(MAX) ? T A
P D(MAX) =
P D(MAX) =
I OUT =
stability. A 1μF or larger capacitor is recommended
between OUT (output) and GND to improve the
regulator’s transient response. A 0.1μF capacitor can be
used to reduce overshoot recovery time at the expense
of overshoot amplitude. The ESR (effective series
resistance) of this capacitor has no effect on regulator
stability, but low-ESR capacitors improve high frequency
transient response. The value of this capacitor may be
increased without limit, but values larger than 10μF tend
to increase the settling time after a step change in input
voltage or output current.
The MIC5231 has no minimum load current; it will
remain stable and in regulation with no load (other than
the internal voltage divider). This is especially important
in real-time clock and CMOS RAM keep-alive
applications.
Minimum Load Current
The MIC5231 does not require a minimum load for
proper operation. This allows the device to operate in
applications where very light output currents are required
for keep-alive purposes. This is important for powering
SRAM or Flash memory in low-power modes for
handheld devices.
Safe Operating Conditions
The MIC5231 does not incorporate current limit or
thermal shutdown in the design. The output pass
element is approximately 15 ? , therefore, when a short
occurs from the output to ground, the current is self-
limited. The pass element has a positive temperature
coefficient, such that when the device gets hot, the
output impedance goes up, limiting the current even
further. The maximum junction temperature for the
device is +125°C, and it is important that this is not
exceeded for any length of time.
The MIC5231 consumes only 0.65μA over load and
does not need to consider that contribution in the power
dissipation equation, therefore the equation is simplified.
P D = ( V IN ? V OUT ) I OUT
The MIC5231, in the IttyBitty SOT-23-5 package, has a
thermal resistance, junction-to-ambient, of 235°C/W.
Using this number, the power dissipation capability of
that package, without exceeding a +125°C junction
temperature rating, can easily be calculated.
P D(MAX) =
θ JA
125 ° C ? T A
235 ° C/W
If the device is being operated at +85°C, the maximum
power dissipation allowed can easily be determined.
125 ° C ? 85 ° C
235 ° C/W
P D(MAX) = 170mW
Therefore, the device can only dissipate 170mW
maximum. If the MIC5231 is powered off of a 12V
source and the output voltage is 3.3V, the maximum
output current can be calculated.
P D(MAX) = ( V IN ? V OUT ) I OUT
170mW = ( 12V ? 3.3V ) I OUT
170mW
8.7V
I OUT = 19.5mA
Therefore, the device can source almost 20mA at an
ambient of +85°C before the die temperature exceeds
+125°C.
November 2008
6
M9999-110408-B
相关PDF资料 |
PDF描述 |
|---|---|
| MIC5232-2.8YML TR | IC REG LDO 2.8V 10MA 6-MLF |
| MIC5233-3.0YM5 TR | IC REG LDO 3V .1A SOT23-5 |
| MIC5234YME | IC REG LDO ADJ .15A 8SOIC |
| MIC5235-3.0YM5 TR | IC REG LDO 3V .15A SOT23-5 |
| MIC5236-2.5YMM | IC REG LDO 2.5V .15A 8-MSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5231-3.0BM5 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Micropower μCap LDO Regulator |
| MIC5231-3.0BM5 TR | 功能描述:IC REG LDO 3V 10MA SOT23-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:3,000 系列:- 稳压器拓扑结构:正，固定式 输出电压:3.8V 输入电压:最高 16V 电压 - 压降（标准）:0.3V @ 80mA 稳压器数量:1 电流 - 输出:80mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°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) 其它名称:MIC5203-3.8BM5TRMIC5203-3.8BM5TR-ND |
| MIC5231-3.0BM5YR | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC5231-3.0YM5 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Micropower μCap LDO Regulator |
| MIC5231-3.0YM5 TR | 功能描述:低压差稳压器 - LDO Ultra Low Iq LDO Regulator(Lead Free) 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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