參數(shù)資料
型號： LTC3533EDE#TR
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： 7 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO14
封裝： 4 X 3 MM, 0.75 MM HEIGHT, PLASTIC, MO-229WGED-3, DFN-14
文件頁數(shù)： 3/16頁
文件大小： 313K
代理商： LTC3533EDE#TR
LTC3533
11
3533f
APPLICATIONS INFORMATION
Inductor Selection
The high frequency operation of the LTC3533 allows the
use of small surface mount inductors. The inductor ripple
current is typically set to 20% to 40% of the maximum
inductor current. For a given ripple the inductance terms
are given as follows:
L
VV
V
fI
V
BOOST
IN MIN
OUT
IN MIN
L
OUT
>
()
(
)
2
H
L
VV
V
fI
V
H
BUCK
OUT
IN MAX
OUT
LIN MAX
>
(
)
()
where f = switching frequency, Hz
IL = maximum allowable inductor ripple current
VIN(MIN) = minimum input voltage
VIN(MAX) = maximum input voltage
VOUT = output voltage
For high efciency, choose a ferrite inductor with a high
frequency core material to reduce core losses. The induc-
tor should have low ESR (equivalent series resistance) to
reduce the I2R losses, and must be able to handle the peak
inductor current without saturating. Molded chokes or chip
inductors usually do not have enough core to support the
peak inductor currents in the 4A to 6A region. To minimize
radiated noise, use a shielded inductor. See Table 1 for a
suggested list of inductor suppliers.
Output Capacitor Selection
The bulk value of the output lter capacitor is set to reduce
the ripple due to charge into the capacitor each cycle. The
steady state ripple due to charge is given by:
%_
(
)
()
(
)
Ripple Boost
IV
V
OUT MAX
OUT
IN MIN
=
100
C
CV
f
Ripple Buck
VV
OUT
IN MAX
OUT
%
%_
()
()
2
=
1
100
8
2
LC
V
f
OUT
IN MAX
%
()
where COUT = output lter capacitor
IOUT(MAX) = maximum output load current
The output capacitance is usually many times larger than
the minimum value in order to handle the transient response
COMPONENT SELECTION
Figure 4. Recommended Component Placement. Traces Carrying
High Current Should be Short and Wide. Trace Area at FB and VC
Pins are Kept Low. Lead Length to Battery Should be Kept Short.
PVOUT and PVIN Ceramic Capacitors Close to the IC Pins.
Table 1. Inductor Vendor Information
SUPPLIER
PHONE
FAX
WEB SITE
Coilcraft
(847) 639-6400
(847) 639-1469
www.coilcraft.com
CoEv Magnetics
(800) 227-7040
(650) 361-2508
www.circuitprotection.com/magnetics.asp
Murata
(814) 237-1431
(800) 831-9172
(814) 238-0409
www.murata.com
Sumida
USA: (847) 956-0666
Japan: 81(3) 3607-5111
USA: (847) 956-0702
Japan: 81(3) 3607-5144
www.sumida.com
TDK
(847) 803-6100
(847) 803-6296
www.component.tdk.com
TOKO
(847) 297-0070
(847) 699-7864
www.tokoam.com
14
13
12
11
10
9
8
1
2
3
4
5
6
7
VC
FB
RUN/SS
PVIN
VIN
PVOUT
VOUT
RT
BURST
SGND
SW1
PGND
SW2
VIN
VOUT
3533 F04
MULTIPLE VIAS
GND
相關(guān)PDF資料
PDF描述
LTC3533EDE 7 A SWITCHING REGULATOR, 2000 kHz SWITCHING FREQ-MAX, PDSO14
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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LTC3534EGN#PBF 功能描述:IC REG BUCK BST SYNC 0.5A 16SSOP 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
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