参数资料
| 型号： | MIC5211-3.0YM6 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/9页 |
| 文件大小： | 0K |
| 描述： | IC REG LDO 3V 50MA SOT23-6 |
| 标准包装： | 3,000 |
| 稳压器拓扑结构： | 正，固定式 |
| 输出电压： | 3V |
| 输入电压： | 2.5 V ~ 16 V |
| 电压 - 压降（标准）： | 0.25V @ 50mA |
| 稳压器数量： | 2 |
| 电流 - 输出： | 50mA |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SOT-23-6 |
| 供应商设备封装： | SOT-23-6 |
| 包装： | 带卷 (TR) |
| 其它名称： | MIC5211-3.0YM6TR MIC5211-3.0YM6TR-ND |
MIC5211
both regulators are dropping the voltage to 3.0V, then output
current will be limited at higher ambient temperatures.
For example, at 70°C ambient the ?rst regulator can supply
3.0V at 50mA output from a 7.2V supply; however, the sec-
ond regulator will have limitations on output current to avoid
thermal shutdown. The dissipation of the ?rst regulator is:
P D1 = (7.2V – 3V) 50mA + 7.2V · 0.85mA
P D1 = 216mW
Since maximum power dissipation for the dual regulator is
250mW at 70°C, the second regulator can only dissipate up
to 34mW without going into thermal shutdown. The amount
of current the second regulator can supply is:
P D2(max) = 34mW
(7.2V – 3V) I OUT2(max) = 34mW
4.2V ? I OUT2(max) = 34mW
I OUT2(max) = 8mA
The second regulator can provide up to 8mA output current,
suitable for the keep-alive circuitry often required in hand-
held applications.
Refer to Application Hint 17 for heat sink requirements when
higher power dissipation capability is needed. Refer to Design-
ing with Low Dropout Voltage Regulators for a more thorough
discussion of regulator thermal characteristics.
Dual-Voltage Considerations
For con?gurations where two different voltages are needed
in the system, the MIC5211 has the option of having two
independent output voltages from the same input. For ex-
ample, a 3.3V rail and a 5.0V rail can be supplied from the
MIC5211 for systems that require both voltages. Important
considerations must be taken to ensure proper functionality
of the part. The input voltage must be high enough for the 5V
section to operate correctly, this will ensure the 3.3V section
proper operation as well.
Micrel, Inc.
Both regulators live off of the same input voltage, therefore
the amount of output current each regulator supplies may
be limited thermally. The maximum power the MIC5211 can
dissipate at room temperature is 455mW, as shown in the
“Thermal Considerations” section. If we assume 6V input
voltage and 50mA of output current for the 3.3V section
of the regulator, then the amount of output current the 5V
section can provide can be calculated based on the power
dissipation.
P D = (V GND – V OUT ) I OUT + V GND · I GND
P D(3.3V) = (6V – 3.3V) 50mA + 6V · 0.85mA
P D(3.3V) = 140.1mW
P D(max) = 455mW
P D(max) – P D(3.3V) = P D(5V)
P D(5V) = 455mW – 140.1mW
P D(5V) = 314.9mW
Based on the power dissipation allowed for the 5V section, the
amount of output current it can source is easily calculated.
P D(5V) = 314.9mW
314.9mW = (6V – 5V) I MAX – 6V · I GND
(I GND typically adds less than 5% to the total power dissipa-
tion and in this case can be ignored)
314.9mW = (6V – 5V) I MAX
I MAX = 314.9mA
I MAX exceeds the maximum current rating of the device.
Therefore, for this condition, the MIC5211 can supply 50mA
of output current from each section of the regulator.
MIC5211
8
May 2006
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PDF描述 |
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| ADP222ACPZ-1833-R7 | IC REG LDO 1.8V/3.3V .3A 8LFCSP |
| ADP222ACPZ-1815-R7 | IC REG LDO 1.8V/1.5V .3A 8LFCSP |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC5211-33BM6 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC5211-5.0BM6 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC5211-5.0BM6 TR | 功能描述:IC REG LDO 5V 50MA SOT23-6 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - 线性 系列:- 标准包装:500 系列:- 稳压器拓扑结构:正，固定式 输出电压:12V 输入电压:14.5 V ~ 35 V 电压 - 压降（标准）:- 稳压器数量:1 电流 - 输出:500mA 电流 - 限制（最小）:- 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:TO-205AD，TO-39-3 金属罐 供应商设备封装:TO-39 包装:散装 其它名称:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| MIC5211-5.0BM6TR | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| MIC5211-5.0YM6 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Dual μCap 80mA LDO Regulator |
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