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參數(shù)資料
| 型號(hào)： | MIC5191BMM TR |
| 廠商： | Micrel Inc |
| 文件頁(yè)數(shù)： | 13/15頁(yè) |
| 文件大?。?/td> | 845K |
| 描述： | IC REG CTRLR SGL POS ADJ 10-MSOP |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類(lèi)型： | 正，可調(diào)式 |
| 輸出數(shù)： | 1 |
| 輸出電壓： | 可調(diào) |
| 電流 - 電源： | 15mA |
| 輸入電壓： | 1 V ~ 5.5 V |
| 工作溫度： | -40°C ~ 125°C |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 供應(yīng)商設(shè)備封裝： | 10-MSOP |
| 包裝： | 帶卷 (TR) |
| 其它名稱(chēng)： | MIC5191BMMTR MIC5191BMMTR-ND |
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Micrel, Inc.
MIC5191
December 2006
13
M9999-122206
The transient response also contributes to the overall AC
output voltage deviation. Figure 12 shows a 1A to 10A
load transient. The top trace is the output of the
switching regulator (same circuit as Figure10). The
output voltage undershoots by 100mV. Just by their
topology, linear regulators have the ability to respond at
much higher speeds than a switching regulator. Linear
regulators do not have the limitation or restrictions of
switching regulators which must reduce their bandwidth
to less than their switching frequency.
Using the MIC5191 as a filter for a switching regulator
reduces output noise due to ripple and high frequency
switching noise. It also reduces undershoot (Figure 12)
and over-shoot (Figure 13) due to load transients with
decreased capacitance.
Figure 13. Transient Response
Due to the high DC gain (80dB) of the MIC5191, it also
adds increased output accuracy and extremely high load
regulation.
Distributed Power Supply
As technology advances and processes move to smaller
and smaller geometries, voltage requirements go down
and current requirements go up. This creates unique
challenges when trying to supply power to multiple
devices on a board. When there is one load to power,
the difficulties are not quite as complex; trying to
distribute power to multiple loads from one supply is
much more problematic.
If a large circuit board has multiple small-geometry
ASICs, it will require the powering of multiple loads with
its one power source. Assuming that the ASICs are
dispersed throughout the board and that the core voltage
requires a regulated 1V, Figure 14 shows the long traces
from the power supply to the loads. Not only do we have
to contend with the tolerance of the supply (line
regulation, load regulation, output accuracy and
temperature tolerances), but the trace lengths create
additional issues with resistance and inductance. With
lower voltages these parasitic values can easily bump
the output voltage out of a usable tolerance.
Load
Load
Switching
Power
Supply
Circuit Board
Load
Load
Long Traces
Figure 14. Board Layout
But by placing multiple, small MIC5191 circuits close to
each load, the parasitic trace elements caused by
distance to the power supply are almost completely
negated. By adjusting the switching supply voltage to
1.2V, for example, the MIC5191 will provide accurate 1V
output, efficiently and with very little noise.
Load
Load
Switching
Power
Supply
Circuit Board
Load
Load
MIC5191
MIC5191
MIC5191
MIC5191
Figure 15. Improved Distributed Supplies
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC5191YML | 制造商:MICREL 制造商全稱(chēng):Micrel Semiconductor 功能描述:Ultra High-Speed, High-Current Active Filter / LDO Controller |
| MIC5191YML TR | 功能描述:低壓差控制器 - LDO Ultra Hi-Speed Hi-Current Active Filter/LDO Controller(Lead Free) RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類(lèi)型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
| MIC5191YML-TR | 功能描述:Linear Regulator Controller IC Positive Adjustable 1 Output 10-MLF? (3x3) 制造商:microchip technology 系列:- 包裝:* 零件狀態(tài):停產(chǎn) 類(lèi)型:正，可調(diào)式 輸出數(shù):1 電流 - 電源:15mA 電壓 - 輸入:1 V ~ 5.5 V 工作溫度:-40°C ~ 125°C 封裝/外殼:10-VFDFN 裸露焊盤(pán)，10-MLF? 供應(yīng)商器件封裝:10-MLF?（3x3） 標(biāo)準(zhǔn)包裝:1 |
| MIC5191YMM | 功能描述:低壓差控制器 - LDO Ultra Hi-Speed Hi-Current Active Filter/LDO Controller(Lead Free) RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類(lèi)型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
| MIC5191YMM TR | 功能描述:低壓差控制器 - LDO Ultra Hi-Speed Hi-Current Active Filter/LDO Controller(Lead Free) RoHS:否 制造商:Micrel 最大輸入電壓:5.5 V 輸出電壓:Adjustable 輸出電流:10 mA 負(fù)載調(diào)節(jié): 輸出類(lèi)型:Adjustable, Fixed 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOT-23-6 |
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