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參數(shù)資料
| 型號(hào)： | MC78LC40 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Micropower Voltage Regulator(三端正固定電壓的穩(wěn)壓器) |
| 中文描述： | 微功耗穩(wěn)壓器（三端正固定電壓的穩(wěn)壓器） |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 100K |
| 代理商： | MC78LC40 |
MC78LC00 Series
http://onsemi.com
8
APPLICATIONS INFORMATION
A typical application circuit for the MC78LC00 series is
shown in Figure 20.
Input Decoupling (C1)
A 0.1
recommended and should be connected close to the
MC78LC00 package. Higher values and lower ESR will
improve the overall line transient response.
F capacitor either ceramic or tantalum is
Output Decoupling (C2)
The MC78LC00 is a stable component and does not
require any specific Equivalent Series Resistance (ESR) or
a minimum output current. Capacitors exhibiting ESRs
ranging from a few m up to 3.0 can thus safely be used.
The minimum decoupling value is 0.1 F and can be
augmented to fulfill stringent load transient requirements.
The regulator accepts ceramic chip capacitors as well as
tantalum devices. Larger values improve noise rejection and
load regulation transient response.
Hints
Please be sure the Vin and GND lines are sufficiently
wide. When the impedance of these lines is high, there is a
chance to pick up noise or cause the regulator to
malfunction.
Set external components, especially the output capacitor,
as close as possible to the circuit, and make leads as short as
possible.
Thermal
As power across the MC78LC00 increases, it might
become necessary to provide some thermal relief. The
maximum power dissipation supported by the device is
dependent upon board design and layout. Mounting pad
configuration on the PCB, the board material, and also the
ambient temperature effect the rate of temperature rise for
the part. This is stating that when the MC78LC00 has good
thermal conductivity through the PCB, the junction
temperature will be relatively low with high power
dissipation applications.
The maximum dissipation the package can handle is
given by:
TJ(max)
PD
TA
RJA
If junction temperature is not allowed above the
maximum 125
°
C, then the MC78LC00NTR can dissipate
up to 357 mW @ 25
°
C.
The power dissipated by the MC78LC00NTR can be
calculated from the following equation:
Ptot
[Vin* Ignd(Iout)]
or
[Vin
Vout] * Iout
VinMAX
Ptot
Vout*Iout
Ignd
Iout
If an 80 mA output current is needed then the ground
current from the data sheet is 1.1
MC78LC30NTR (3.0 V), the maximum input voltage will
then be 7.4 V.
A. For an
V
out
C2
+
C1
+
Battery or
Unregulated
Voltage
Figure 20. Basic Application Circuit for NTR Suffixes
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC78LC40HT1 | 功能描述:低壓差穩(wěn)壓器 - LDO 4.0V 80mA CMOS LDO 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 |
| MC78LC40HT1G | 功能描述:低壓差穩(wěn)壓器 - LDO 4.0V 80mA CMOS LDO 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 |
| MC78LC40NTR | 功能描述:低壓差穩(wěn)壓器 - LDO 4.0V 80mA CMOS LDO 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 |
| MC78LC40NTRG | 功能描述:低壓差穩(wěn)壓器 - LDO 4.0V 80mA CMOS LDO 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 |
| MC78LC50HT1 | 功能描述:低壓差穩(wěn)壓器 - LDO 5.0V 80mA CMOS LDO 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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