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參數資料
| 型號： | ILC7082AIK5-285 |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 固定正電壓單路輸出LDO穩(wěn)壓器 |
| 英文描述： | 2.85 V FIXED POSITIVE LDO REGULATOR, 0.3 V DROPOUT, PDSO8 |
| 封裝： | PLASTIC, SOIC-8 |
| 文件頁數： | 15/16頁 |
| 文件大?。?/td> | 322K |
| 代理商： | ILC7082AIK5-285 |
150mA SOT-23 Ultra Low Noise CMOS RF-LDO Regulator
Rev. 1.4 September 2001
8
However, being aware of these current flows, there is also
another potential source of induced voltage noise from the
resistance inherent in the PCB trace. Figure 6 shows where
the additive resistance of the PCB can manifest itself. Again
these resistances may be very small, but a summation of
several currents can develop detectable voltage ripple and
will be amplified by the LDO. Particularly the accumulation
of current flows in the ground plane can develop significant
voltages unless care is taken. With a degree of care, the
ILC7082 will yield outstanding performance.
Printed Circuit Board Layout Guidelines
As was mentioned in the previous section, to take full
advantage of any high performance LDO regulator requires
paying careful attention to grounding and printed circuit
board (PCB) layout.
Figure 7 shows the effects of poor grounding and PCB lay-
out magnified by the ESR and PCB resistances and the
accumulation of current flows.
Note thatparticularly during high output load current, the
LDO regulator’s ground pin and the ground return for C
OUT
and C
NOISE
are not at the same potential as the system
ground. This is due to high frequency impedance caused by
PCB’s trace inductance and DC resistance. The current
loop between C
OUT, CNOISE and the LDO regulator’s ground
pin will degrade performance of the LDO.
Figure 8 shows an optimum schematic. In this schematic,
high output surge current has little effect on the ground cur-
rent and noise bypass current return of the LDO regulator.
Note that the key difference here is that C
OUT and CNOISE are
directly connected to the LDO regulator’s ground pin. The
LDO is then separately connected to the main ground plane
and returned to a single point system ground.
The layout of the LDO and its external components are also
based on some simple rules to minimize EMI and output
voltage ripple.
ILC7082
SOT-23-5
ON
OFF
12
3
4
5
C
NOISE
R
PCB
ESR
R
PCB
V
IN
C
IN
I
OUT
C
OUT
I
1
ESR
V
OUT
R
PCB
R
PCB
Figure 6: Inherent PCB resistance
Figure 7: Effects of poor circuit layout
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PDF描述 |
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| ILS-08053.9UH+/-20% | 1 ELEMENT, 3.9 uH, GENERAL PURPOSE INDUCTOR, SMD |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| ILC7082AIM525X | 功能描述:低壓差穩(wěn)壓器 - LDO 0.15A 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數量: 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 |
| ILC7082AIM525X_Q | 功能描述:低壓差穩(wěn)壓器 - LDO 0.15A 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數量: 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 |
| ILC7082AIM526X | 功能描述:低壓差穩(wěn)壓器 - 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數量: 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 |
| ILC7082AIM527X | 功能描述:低壓差穩(wěn)壓器 - 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 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調節(jié):0.3 % 輸出端數量: 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 |
| ILC7082AIM5-28 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Positive Fixed Voltage Regulator |
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