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參數(shù)資料
| 型號： | LTC3528EDDB-2#TRMPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, 2400 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 3 X 2 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229WECD-1, DFN-8 |
| 文件頁數(shù)： | 4/24頁 |
| 文件大?。?/td> | 0K |
| 代理商： | LTC3528EDDB-2#TRMPBF |
LTC3528-2
12
35282f
APPLICATIONS INFORMATION
VIN > VOUT OPERATION
The LTC3528-2 maintains voltage regulation even when
the input voltage is above the desired output voltage. Note
that the efficiency is much lower in this mode, and the
maximum output current capability will be less. Refer to
the Typical Performance Characteristics.
SHORT-CIRCUIT PROTECTION
TheLTC3528-2outputdisconnectfeatureallowsanoutput
short circuit while maintaining a maximum internally set
current limit. To reduce power dissipation under short-
circuit conditions, the peak switch current limit is reduced
to 750mA (typical).
SCHOTTKY DIODE
Although not required, adding a Schottky diode from
SW to VOUT will improve efficiency by about 2%. Note
that this defeats the output disconnect and short-circuit
protection features.
PCB LAYOUT GUIDELINES
The high speed operation of the LTC3528-2 demands
careful attention to board layout. A careless layout will
not produce the advertised performance. Figure 2 shows
the recommended component placement. A large ground
copper area with the package backside metal pad properly
soldered will help to lower the chip temperature. A multi-
layer board with a separate ground plane is ideal, but not
absolutely necessary.
COMPONENT SELECTION
Inductor Selection
TheLTC3528-2canutilizesmallsurfacemountchipinduc-
tors due to its fast 2MHz switching frequency. Inductor
values between 1.5H and 3.3H are suitable for most
applications.Largervaluesofinductancewillallowslightly
greater output current capability by reducing the inductor
ripple current. Increasing the inductance above 10H will
increase size while providing little improvement in output
current capability.
The minimum inductance value is given by:
L
>
VIN(MIN) VOUT(MAX) – VIN(MIN)
(
)
2 Ripple VOUT(MAX)
H
where:
Ripple = Allowable inductor current ripple (amps peak-
peak)
VIN(MIN) = Minimum input voltage
VOUT(MAX) = Maximum output voltage
The inductor current ripple is typically set for 20% to
40% of the maximum inductor current. High frequency
ferritecoreinductormaterialsreducefrequencydependent
power losses compared to cheaper powdered iron types,
improving efficiency. The inductor should have low ESR
(seriesresistanceofthewindings)toreducetheI2Rpower
losses, and must be able to handle the peak inductor cur-
rent without saturating. Molded chokes and some chip
inductors usually do not have enough core area to support
the peak inductor currents of 1.5A seen on the LTC3528-2.
To minimize radiated noise, use a shielded inductor. See
Table 1 for suggested components and suppliers.
Figure 2. Recommended Component Placement
for Single Layer Board
SHDN
FB
PGOOD
LTC3528-2
VOUT
35282 F02
COUT
VIN
CIN
SGND
PGND
SW
MULTIPLE VIAS
TO GROUND PLANE
8
5
6
7
1
4
3
2
+
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3528EDDB-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1A, 1MHz Synchronous Step-Up DC/DC Converters in 3mm × 2mm DFN |
| LTC3528EDDB-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:1A, 1MHz Synchronous Step-Up DC/DC Converters in 3mm × 2mm DFN |
| LTC3529EDCB#PBF | 制造商:Linear Technology 功能描述:IC SYNC STEP-UP DC/DC CONVERTER DFN-8 制造商:Linear Technology 功能描述:DP-SWREG/Monolithic, Cut Tape 1.5A, 2.35MHz Step-Up DC/DC Converter in 2mm x 3mm 制造商:Linear Technology 功能描述:IC, SYNC STEP-UP DC/DC CONVERTER, DFN-8, Primary Input Voltage:5.25V, No. of Outputs:1, Output Voltage:5V, Output Current:500mA, No. of Pins:8, Operating Temperature Min:-40C, Operating Temperature Max:85C, MSL:MSL 1 - Unlimited , RoHS Compliant: Yes |
| LTC3529EDCB#TRMPBF | 功能描述:IC REG BOOST SYNC 5V 1.5A 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝: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: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) 供應商設備封裝:6-SON（1.45x1） 產品目錄頁面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC3529EDCB#TRPBF | 功能描述:IC REG BOOST SYNC 5V 1.5A 8DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關穩(wěn)壓器 系列:- 標準包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調式 輸出數(shù):1 輸出電壓:1.24 V ~ 30 V 輸入電壓:1.5 V ~ 12 V PWM 型:電流模式，混合 頻率 - 開關:600kHz 電流 - 輸出:500mA 同步整流器:無 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:8-SOIC（0.154"，3.90mm 寬） 包裝:帶卷 (TR) 供應商設備封裝:8-SOIC |
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