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參數(shù)資料
| 型號： | LTC3546IFE#TR |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | DUAL SWITCHING CONTROLLER, 4000 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 4.40 MM, PLASTIC, TSSOP-28 |
| 文件頁數(shù)： | 7/28頁 |
| 文件大?。?/td> | 356K |
| 代理商： | LTC3546IFE#TR |
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LTC3546
15
3546fb
Burst Mode Operation Considerations
Therearetwofactorsthatdeterminetheloadcurrentatwhich
theLTC3546entersBurstModeoperation:theinductorvalue
and the BMC pin voltage. The transition from low current
operation begins when the peak inductor current falls below
a level set by the burst clamp. Lower inductor values result in
higher ripple current which causes Burst Mode operation to
occur at lower load currents. Lower inductor values will also
cause a dip in efciency in the upper range of low current
operation. Lower inductor values will also cause the burst
frequency to increase in Burst Mode operation.
The burst clamp level can be set by the voltage on the BMC
pin. If BMC is tied to VIN, an internally set level is used. A
BMC pin voltage between 0V and 0.6V will set the burst
clamp level (see charts OUT1 Minimum Peak Current vs
VBMC1 and OUT2 Minimum Peak Current vs VBMC2 in the
Typical Performance Characteristics section). Generally, a
higher clamp level results in improved light load efciency
and higher output voltage ripple, while a lower clamp level
results in small output voltage ripple at the expense of
efciency. The BMC pin should be connected to ground
when Burst Mode operation is not selected.
Inductor Core Selection
Different core materials and shapes will change the size/cur-
rent relationship of an inductor. Toroid or shielded pot cores
in ferrite or permalloy materials are small and don’t radiate
much energy, but generally cost more than powdered iron
core inductors with similar electrical characteristics. The
choice of which style inductor to use often depends more
on the price vs size requirements of any radiated eld/EMI
requirements than on what the LTC3546 requires to oper-
ate. Table 1 shows some typical surface mount inductors
that work well in LTC3546 applications.
Input Capacitor (CIN) Selection
In continuous mode, the input current of the converter can
be approximated by the sum of two square waves with
duty cycles of approximately VOUT1/VIN and VOUT2/VIN. To
prevent large voltage transients, a low equivalent series
resistance (ESR) input capacitor sized for the maximum
RMS current must be used. Some capacitors have a de-
rating spec for maximum RMS current. If the capacitor
being used has this requirement it is necessary to calculate
APPLICATIONS INFORMATION
Table 1.
MANUFACTURER
PART NUMBER
VALUE (μH)
MAX DC CURRENT (A)
DCR
DIMENSIONS L × W × H (mm)
Würth Elektronik
WE-PD2 MS
7447745012
1.2
4.6
0.017
5.2 × 5.8 × 2
Würth Elektronik
WE-PD2 MS
74477450056
0.56
6.5
0.0078
5.2 × 5.8 × 2
Vishay
IHLP-1616AB-11
1.2
3.75
0.068
4.06 × 4.45 × 1.20
Vishay
IHLP-1616AB-11
0.47
6
0.019
4.06 × 4.45 × 1.20
Coilcraft
LPS6225-122
1.2
5.4
0.04
6.2 × 6.2 × 2.5
Coilcraft
DO1813H-561
0.56
7.7
0.01
6.10 × 8.89 × 5.00
Coiltronics
SD20-1R2
1.2
2.55
0.0275
5.2 × 5.2 × 2
Coiltronics
SD20-R47
0.47
4
0.02
5.2 × 5.2 × 2
Sumida
CDRH3D23NP-1R5NC
1
2.8
0.025
3.8 × 3.8 × 2.3
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3546IFETRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Synchronous, 3A/1A or 2A/2A Confi gurable Step-Down DC/DC Regulator |
| LTC3546IUFD#PBF | 功能描述:IC REG BUCK SYNC ADJ 1A/2A 28QFN 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:- 產(chǎn)品培訓(xùn)模塊:MIC23xxx HyperLight Load™ Regulators 標(biāo)準(zhǔn)包裝:5,000 系列:HyperLight Load® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:1.8V 輸入電壓:2.7 V ~ 5.5 V PWM 型:混合物 頻率 - 開關(guān):4MHz 電流 - 輸出:2A 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:8-VFDFN 裸露焊盤，8-MLF? 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:8-MLF?（2x2） 產(chǎn)品目錄頁面:1094 (CN2011-ZH PDF) 其它名稱:576-3303-2 |
| LTC3546IUFD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 1A/2A 28QFN 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:- 設(shè)計資源:Design Support Tool 標(biāo)準(zhǔn)包裝:1 系列:- 類型:升壓（升壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:3V 輸入電壓:0.75 V ~ 2 V PWM 型:- 頻率 - 開關(guān):- 電流 - 輸出:100mA 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:SOT-23-5 細型，TSOT-23-5 包裝:剪切帶 (CT) 供應(yīng)商設(shè)備封裝:TSOT-23-5 其它名稱:AS1323-BTTT-30CT |
| LTC3546IUFDPBF | 制造商:Linear Technology 功能描述:Conv DC-DC Dual Step-Down 5.5V QFN28EP |
| LTC3546IUFDTRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Dual Synchronous, 3A/1A or 2A/2A Confi gurable Step-Down DC/DC Regulator |
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