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參數(shù)資料
| 型號(hào)： | MIC5312 |
| 廠商： | Micrel Semiconductor,Inc. |
| 元件分類： | 線性穩(wěn)壓 |
| 英文描述： | LowQ Mode Dual 300mA LDO with Integrated POR |
| 中文描述： | LOWQ模式雙300mA的LDO集成葡萄牙 |
| 文件頁數(shù)： | 2/11頁 |
| 文件大?。?/td> | 400K |
| 代理商： | MIC5312 |
Micrel, Inc.
MIC5312
February 2005
10
M9999-021105
(408) 955-1690
The actual power dissipation of the regulator circuit can
be determined using the equation:
PDTOTAL = PD LDO1 + PD LDO2
PD LDO1 = (VIN-VOUT1) x IOUT1
PD LDO2 = (VIN-VOUT2) x IOUT2
Substituting PD(max) for PD and solving for the operating
conditions that are critical to the application will give the
maximum operating conditions for the regulator circuit.
For example, when operating the MIC5312 at 60°C with
a minimum footprint layout, the maximum load currents
can be calculated as follows:
PD (max) = (TJ (max) - TA) /θJA
PD (max) = (125°C - 60°C) / 63°C /W
PD (max) = 1.03W
The junction-to-ambient thermal resistance for the
minimum footprint is 63°C/W, from Table 1. The
maximum power dissipation must not be exceeded for
proper operation. Using a lithium-ion battery as the
supply voltage of 4.2V, 1.8VOUT/150mA for channel 1
and 2.8VOUT/100mA for channel 2, power dissipation
can be calculated as follows:
PD LDO1 = (VIN-VOUT1) x IOUT1
PD LDO1 = (4.2V-1.8V) x 150mA
PD LDO1 = 360mW
PD LDO2 = (VIN-VOUT2) x IOUT2
PD LDO1 = (4.2V-2.8V) x 100mA
PD LDO1 = 140mW
PDTOTAL = PD LDO1 + PD LDO2
PDTOTAL = 360mW + 140mW
PDTOTAL = 500mW
The calculation shows that we are well below the
maximum allowable power dissipation of 1.03W for a
60° ambient temperature.
After the maximum power dissipation has been
calculated, it is always a good idea to calculate the
maximum ambient temperature for a 125° junction
temperature. Calculating maximum ambient temperature
as follows:
TA(max) = TJ(max) – (PD x θJA)
TA(max) = 125°C – (500mW x 63°C/W)
TA(max) = 93.5°C
For a full discussion of heat sinking and thermal effects
on voltage regulators, refer to the “Regulator Thermals”
section of Micrel’s Designing with Low-Dropout Voltage
Regulators
handbook.
This information can be found on Micrel's website at:
http://www.micrel.com/_PDF/other/LDOBk_ds.pdf
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| MIC5312-DKBML TR | 功能描述:IC REG LDO 1.85V/2.6V .3A 10-MLF RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:500 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:12V 輸入電壓:14.5 V ~ 35 V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:500mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:TO-205AD，TO-39-3 金屬罐 供應(yīng)商設(shè)備封裝:TO-39 包裝:散裝 其它名稱:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| MIC5312-DKYML TR | 功能描述:低壓差穩(wěn)壓器 - LDO Portable Power IC in 3mm x 3mm MLF LowQ Dual Cap LDO w/Integrated POR RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MIC5312-GMBML TR | 功能描述:IC REG LDO 1.8V/2.8V .3A 10-MLF RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標(biāo)準(zhǔn)包裝:500 系列:- 穩(wěn)壓器拓?fù)浣Y(jié)構(gòu):正，固定式 輸出電壓:12V 輸入電壓:14.5 V ~ 35 V 電壓 - 壓降（標(biāo)準(zhǔn)）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:500mA 電流 - 限制（最?。?- 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:TO-205AD，TO-39-3 金屬罐 供應(yīng)商設(shè)備封裝:TO-39 包裝:散裝 其它名稱:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| MIC5312-GMYML TR | 功能描述:低壓差穩(wěn)壓器 - LDO Portable Power IC in 3mm x 3mm MLF LowQ Dual Cap LDO w/Integrated POR RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MIC5312-GPYML TR | 功能描述:低壓差穩(wěn)壓器 - LDO Portable Power IC in 3mm x 3mm MLF LowQ Dual Cap LDO w/Integrated POR RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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