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參數(shù)資料
| 型號(hào)： | MC33761 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Ultra Low-Noise Low Dropout Voltage Regulator with 1.0 V ON/OFF Control(超低噪聲，帶1.0V開關(guān)控制的低壓差穩(wěn)壓器) |
| 中文描述： | 超低噪聲低壓差穩(wěn)壓器1.0第V /關(guān)控制（超低噪聲，帶1.0V的開關(guān)控制的低壓差穩(wěn)壓器） |
| 文件頁數(shù)： | 6/13頁 |
| 文件大?。?/td> | 402K |
| 代理商： | MC33761 |
MC33761
http://onsemi.com
6
APPLICATION HINTS
Input Decoupling
As with any regulator, it is necessary to reduce the
dynamic impedance of the supply rail that feeds the
component. A 1.0 F capacitor either ceramic or tantalum is
recommended and should be connected close to the
MC33761 package. Higher values will correspondingly
improve the overall line transient response.
Output Decoupling
Thanks to a novel concept, the MC33761 is a stable
component and does not require any specific Equivalent
Series Resistance (ESR) neither 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 1.0 F and can be augmented to fulfill stringent load
transient requirements. The regulator accepts ceramic chip
capacitors as well as tantalum devices.
Noise Decoupling
Unlike other LDOs, the MC33761 is a true lownoise
regulator. Without the need of an external bypass capacitor,
it typically reaches the incredible level of 40 VRMS overall
noise between 100 Hz and 100 kHz. To give maximum
insight on noise specifications, ON Semiconductor includes
spectral density graphics. The classical bypass capacitor
impacts the startup phase of standard LDOs. However,
thanks to its lownoise architecture, the MC33761 operates
without a bypass element and thus offers a typical 40 s
startup phase.
Protections
The MC33761 hosts several protections, giving natural
ruggedness and reliability to the products implementing the
component. The output current is internally limited to a
maximum value of 180 mA
typical
while temperature
shutdown occurs if the die heats up beyond 125
°
C. These
values let you assess the maximum differential voltage the
device can sustain at a given output current before its
protections come into play.
The maximum dissipation the package can handle is given
by:
TJmax
RJA
If T
Jmax
is limited to 125
°
C, then the MC33761 can
dissipate up to 470 mW @ 25
°
C. The power dissipated by
the MC33761 can be calculated from the following formula:
Pmax
TA
Ptot
Vin
Ignd(Iout)
Vin
Vout
Iout
or
Vinmax
Ptot
Vout
Iout
Ignd
Iout
If a 80 mA output current is needed, the ground current is
extracted from the datasheet curves: 4.0 mA @ 80 mA. For
a MC33761SNT128 (2.8 V) delivering 80 mA and
operating at 25
°
C, the maximum input voltage will then be
8.3 V.
Typical Applications
The following picture portrays the typical application of
the MC33761.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC33761SNT1025 | 制造商:ON SEMI 功能描述:New |
| MC33761SNT1-025 | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 80mA Output 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 |
| MC33761SNT1-025G | 功能描述:低壓差穩(wěn)壓器 - LDO 2.5V 80mA Output w/Enable Low Noise 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 |
| MC33761SNT1-028 | 功能描述:低壓差穩(wěn)壓器 - LDO 2.8V 80mA Output 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 |
| MC33761SNT1-028G | 功能描述:低壓差穩(wěn)壓器 - LDO 2.8V 80mA Output w/Enable Low Noise 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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