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參數(shù)資料
| 型號： | MIC5306 |
| 廠商： | Micrel Semiconductor,Inc. |
| 元件分類： | 線性穩(wěn)壓 |
| 英文描述： | 150mA Micropower Cap Baseband LDO |
| 中文描述： | 150mA的微功率LDO的第基 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大?。?/td> | 252K |
| 代理商： | MIC5306 |
Micrel, Inc.
MIC5306
August 2005
7
M9999-080805
(408) 955-1690
Applications Information
Input Capacitance
A 1F capacitor should be placed from IN to GND if
there is more than 10 inches of wire between the input
and the ac filter capacitor or if a battery is used as the
input.
Output Capacitance
An output capacitor is required between OUT and
GND to prevent oscillation. Larger values improve the
regulator’s transient response. The output capacitor
value may be increased without limit.
The output capacitor should have below ESR 300m
and a resonant frequency above 1MHz. Ultra-low-ESR
capacitors can cause a low amplitude oscillation on
the output and/or underdamped transient response.
Most tantalum or aluminum electrolytic capacitors are
adequate; film types will work, but are more
expensive. Since many aluminum electrolytics have
electrolytes that freeze at about –30
°C, solid
tantalums are recommended for operation below
–25
°C.
At lower values of output current, less output
capacitance is required for output stability. The
capacitor can be reduced to 0.47F for current below
10mA or 0.33F for currents below 1mA.
Enable
Forcing EN (enable/shutdown) high (>1V) enables the
regulator. EN is compatible with CMOS logic gates. If
the enable/shutdown feature is not required, connect
EN (pin 3) to IN (supply input, pin 1).
Current Limit
There is overcurrent protection circuitry built into the
MIC5306. Even with the output grounded, current will
be limited to approximately 285mA. Further protection
is provided by thermal shutdown.
Thermal Considerations
The MIC5306 is designed to provide 150mA of
continuous current in a very small package. Maximum
ambient operating temperature can be calculated
based on the output current and the voltage drop
across the part. Given that the input voltage is 3.8V,
the output voltage is 2.8V and the output current
equals 150mA.
The actual power dissipation of the regulator circuit
can be determined using the equation:
PD = (VIN – VOUT) IOUT + VIN IGND
Because this device is CMOS and the ground current
is typically < 50A over the load range, the power
dissipation contributed by the ground current is < 1%
and can be ignored for this calculation.
PD = (3.8V – 2.8V) 150mA
PD = 0.15W
To determine the maximum ambient operating
temperature of the package, use the junction-to-
ambient thermal resistance of the device and the
following basic equation:
PD(max) =
TJ(max) – TA
JA
TJ(max) = 125°C, the maximum junction temperature
of the die
θJA thermal resistance = 235°C/W
Table 1 shows junction-to-ambient thermal resistance
for the MIC5306 in the TSOT23-5 package.
Package
θθθθ
JA Recommended
Minimum Footprint
θ
JC
TSOT23-5
235
°C/W
2
°C/W
Table 1. TSOT23-5 Thermal Resistance
Substituting PD for PD(max) and solving for the
ambient operating temperature will give the maximum
operating conditions for the regulator circuit. The
junction-to-ambient thermal resistance for the
minimum footprint is 235
°C/W, from Table 1. The
maximum power dissipation must not be exceeded for
proper operation.
For example, when operating the MIC5306-2.8 at an
input voltage of 3.8V and 150mA load with a minimum
footprint layout, the maximum ambient operating
temperature TA can be determined as follows:
0.15W = (125°C - T) / 235C°/W
T = 89.75°C
Therefore, a 2.8V application at 150mA of output
current can accept an ambient operating temperature
of 89.8
°C in a TSOT23-5 package. 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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| MIC5306-1.5YD5 TR | 功能描述:低壓差穩(wěn)壓器 - LDO 150mA 1% 16uA,60mV LDO Regulator(Lead Free) 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MIC5306-1.8YD5 | 功能描述:IC REG LDO 1.8V .15A TSOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:500 系列:- 穩(wěn)壓器拓撲結構:正，固定式 輸出電壓:12V 輸入電壓:14.5 V ~ 35 V 電壓 - 壓降（標準）:- 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 供應商設備封裝:TO-39 包裝:散裝 其它名稱:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
| MIC5306-1.8YD5 TR | 功能描述:低壓差穩(wěn)壓器 - LDO 150mA 1% 16uA,60mV LDO Regulator(Lead Free) 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| MIC5306-1.8YD5-TR | 功能描述:Linear Voltage Regulator IC Positive Fixed 1 Output 1.8V 150mA TSOT-23-5 制造商:microchip technology 系列:- 包裝:剪切帶（CT） 零件狀態(tài):停產(chǎn) 穩(wěn)壓器拓撲:正，固定式 電壓 - 輸出:1.8V 電流 - 輸出:150mA 電壓 - 跌落（典型值）:0.065V @ 150mA 穩(wěn)壓器數(shù):1 電壓 - 輸入:2.25 V ~ 5.5 V 電流 - 限制（最小值）:175mA 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-5 細型，TSOT-23-5 供應商器件封裝:TSOT-23-5 標準包裝:1 |
| MIC5306-2.5YD5 | 功能描述:IC REG LDO 2.5V .15A TSOT23-5 RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - 線性 系列:- 標準包裝:500 系列:- 穩(wěn)壓器拓撲結構:正，固定式 輸出電壓:12V 輸入電壓:14.5 V ~ 35 V 電壓 - 壓降（標準）:- 穩(wěn)壓器數(shù)量:1 電流 - 輸出:500mA 電流 - 限制（最小）:- 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 供應商設備封裝:TO-39 包裝:散裝 其它名稱:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
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