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參數(shù)資料
| 型號(hào)： | mic5219 |
| 廠商： | Micrel Semiconductor,Inc. |
| 英文描述： | 500mA-Peak Output LDO Regulator(輸出峰值電流500mA的低壓差穩(wěn)壓器) |
| 中文描述： | 500mA的峰值輸出LDO穩(wěn)壓器（輸出峰值電流500mA電流的低壓差穩(wěn)壓器） |
| 文件頁(yè)數(shù)： | 11/12頁(yè) |
| 文件大?。?/td> | 94K |
| 代理商： | MIC5219 |
July 2000
11
MIC5219
MIC5219
Micrel
P
D
×
50mA = 0.875
×
173mW
P
D
×
50mA = 151mW
The power dissipation at 500mA must also be calculated.
P
D
×
500mA = (5V
–
3.3V) 500mA + 5V
×
20mA
P
D
×
500mA = 950mW
This number must be multiplied by the duty cycle at which it
would be operating, 12.5%.
P
D
×
= 0.125
×
950mW
P
D
×
= 119mW
The total power dissipation of the device under these condi-
tions is the sum of the two power dissipation figures.
P
D(total)
= P
D
×
50mA + P
D
×
500mA
P
D(total)
= 151mW + 119mW
P
D(total)
= 270mW
The total power dissipation of the regulator is less than the
maximum power dissipation of the SOT-23-5 package at
room temperature, on a minimum footprint board and there-
fore would operate properly.
Multilayer boards with a ground plane, wide traces near the
pads, and large supply-bus lines will have better thermal
conductivity.
For additional heat sink characteristics, please refer to Micrel
Application Hint 17,
“
Designing P.C. Board Heat Sinks
”
,
included in Micrel
’
s Databook For a full discussion of heat
sinking and thermal effects on voltage regulators, refer to
Regulator Thermals section of Micrel
’
s Designing with Low-
Dropout Voltage Regulators handbook.
Fixed Regulator Circuits
MIC5219-x.x
V
IN
IN
EN
OUT
BYP
GND
1μF
V
OUT
Figure 5. Low-Noise Fixed Voltage Regulator
Figure 5 shows a basic MIC5219-x.xBMX fixed-voltage regu-
lator circuit. A 1
μ
F minimum output capacitor is required for
basic fixed-voltage applications.
MIC5219-x.x
IN
EN
OUT
BYP
GND
470pF
V
IN
2.2μF
V
OUT
Figure 6. Ultra-Low-Noise Fixed Voltage Regulator
Figure 6 includes the optional 470pF noise bypass capacitor
between BYP and GND to reduce output noise. Note that the
minimum value of C
OUT
must be increased when the bypass
capacitor is used.
Adjustable Regulator Circuits
MIC5219
IN
EN
OUT
ADJ
GND
V
IN
1μF
V
OUT
R1
R2
Figure 7. Low-Noise Adjustable Voltage Regulator
Figure 7 shows the basic circuit for the MIC5219 adjustable
regulator. The output voltage is configured by selecting
values for R1 and R2 using the following formula:
V
1.242V
R2
R1
1
OUT
=
+
Although ADJ is a high-impedance input, for best perfor-
mance, R2 should not exceed 470k
.
MIC5219
V
IN
IN
EN
OUT
ADJ
GND
2.2μF
V
OUT
R1
R2
470pF
Figure 8. Ultra-Low-Noise Adjustable Application.
Figure 8 includes the optional 470pF bypass capacitor from
ADJ to GND to reduce output noise.
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| MIC5247 | 150mA Low-Voltage レCap Linear Regulator Preliminary Information |
| MIC5247-1.8BM5 | 150mA Low-Voltage レCap Linear Regulator Preliminary Information |
| MIC5248 | 150mA UCap CMOS LDO Regulator w/Power Good |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC5219_01 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:500mA-Peak Output LDO Regulator |
| MIC5219_09 | 制造商:MICREL 制造商全稱:Micrel Semiconductor 功能描述:500mA-Peak Output LDO Regulator |
| MIC5219-1.2BM5 | 制造商:Exar Corporation 功能描述:Voltage Regulator |
| MIC5219-2.5BM5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MIC5219-2.5BM5 TR | 功能描述:IC REG LDO 2.5V .5A SOT23-5 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(yīng)商設(shè)備封裝:TO-39 包裝:散裝 其它名稱:*LM78M12CH*LM78M12CH/NOPBLM78M12CH |
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