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參數(shù)資料
| 型號(hào)： | LT3580MPMS8E#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 2.8 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | LEAD FREE, PLASTIC, MSOP-8 |
| 文件頁數(shù)： | 7/28頁 |
| 文件大?。?/td> | 289K |
| 代理商： | LT3580MPMS8E#TRPBF |
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LT3580
15
3580fg
APPLICATIONS INFORMATION
so they should not be used for calculating efficiency in
discontinuous mode or at light load currents.
Average Input Current : I
IN =
V
OUT IOUT
V
IN η
Switch I
2R Loss: P
SW = (DC)(IIN )
2(R
SW )
Base Drive Loss (AC): P
BAC = 13n(IIN )(VOUT )(f)
Base Drive Loss (DC): P
BDC =
(V
IN )(IIN )(DC)
50
Input Power Loss: P
INP = 7mA(VIN )
where:
RSW = switch resistance (typically 200mΩ at 1.5A)
DC = duty cycle (see the Power Switch Duty Cycle sec-
tion for formulas)
η = power conversion efficiency (typically 88% at high
currents)
Example: boost configuration, VIN = 5V, VOUT = 12V,
IOUT = 0.5A, f = 1.25MHz, VD = 0.5V:
IIN = 1.36A
DC = 61.5%
PSW = 228mW
PBAC = 270mW
PBDC = 84mW
PINP = 35mW
Total LT3580 power dissipation (PTOT) = 617mW
Thermal resistance for the LT3580 is influenced by the pres-
ence of internal, topside or backside planes. To calculate
die temperature, use the appropriate thermal resistance
number and add in worst-case ambient temperature:
TJ = TA + θJA PTOT
where TJ = junction temperature, TA = ambient tempera-
ture,
θJA = 43°C/W for the 3mm × 3mm DFN package and
35°C/W to 40°C/W for the MSOP Exposed Pad package.
PTOT is calculated above.
VIN Ramp Rate
While initially powering a switching converter application,
the VINramprateshouldbelimited.HighVINrampratescan
cause excessive inrush currents in the passive components
of the converter. This can lead to current and/or voltage
overstress and may damage the passive components or
the chip. Ramp rates less than 500mV/μs, depending on
component parameters, will generally prevent these issues.
Also, be careful to avoid hot-plugging. Hot-plugging occurs
when an active voltage supply is “instantly” connected or
switched to the input of the converter. Hot-plugging results
in very fast input ramp rates and is not recommended.
Finally, for more information, refer to Linear application
note AN88, which discusses voltage overstress that can
occur when an inductive source impedance is hot-plugged
to an input pin bypassed by ceramic capacitors.
Layout Hints
As with all high frequency switchers, when considering
layout, care must be taken to achieve optimal electrical,
thermal and noise performance. One will not get adver-
tised performance with a careless layout. For maximum
efficiency, switch rise and fall times are typically in the
5ns to 10ns range. To prevent noise, both radiated and
conducted, the high speed switching current path, shown in
Figure 8, must be kept as short as possible. This is imple-
mented in the suggested layout of a boost configuration in
Figure 9. Shortening this path will also reduce the parasitic
trace inductance. At switch-off, this parasitic inductance
produces a flyback spike across the LT3580 switch. When
operating at higher currents and output voltages, with poor
layout, this spike can generate voltages across the LT3580
that may exceed its absolute maximum rating. A ground
plane should also be used under the switcher circuitry to
prevent interplane coupling and overall noise.
The VC and FB components should be kept as far away
as practical from the switch node. The ground for these
components should be separated from the switch cur-
rent path. Failure to do so can result in poor stability or
subharmonic oscillation.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT3581 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:3.3A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3581EDE#PBF | 功能描述:IC REG MULTI CONFIG ADJ 14DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:250 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V 輸入電壓:2.05 V ~ 6 V PWM 型:電壓模式 頻率 - 開關(guān):2MHz 電流 - 輸出:500mA 同步整流器:是 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:6-UFDFN 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:6-SON（1.45x1） 產(chǎn)品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LT3581EDE#TRPBF | 功能描述:IC REG MULTI CONFIG ADJ 14DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.2V，1.5V，1.8V，2.5V 輸入電壓:2.7 V ~ 20 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:50mA 同步整流器:是 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬）裸露焊盤 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:10-MSOP 裸露焊盤 |
| LT3581EDE-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:3.3A Boost/Inverting DC/DC Converter with Fault Protection |
| LT3581EDE-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:3.3A Boost/Inverting DC/DC Converter with Fault Protection |
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