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參數(shù)資料
| 型號(hào)： | LTC3442 |
| 廠商： | Linear Integrated Systems |
| 英文描述： | Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation |
| 中文描述： | 微功率同步降壓升壓與自動(dòng)突發(fā)模式的DC / DC轉(zhuǎn)換器操作 |
| 文件頁(yè)數(shù)： | 13/20頁(yè) |
| 文件大?。?/td> | 332K |
| 代理商： | LTC3442 |
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LTC3442
13
3442f
APPLICATIU
W
U
U
COMPONENT SELECTION
Table 1. Inductor Vendor Information
SUPPLIER
Coilcraft
CoEv Magnetics
Murata
PHONE
(847) 639-6400
(800) 227-7040
(814) 237-1431
(800) 831-9172
USA: (847) 956-0666
Japan: 81(3) 3607-5111
(847) 803-6100
(847) 297-0070
FAX
(847) 639-1469
(650) 361-2508
(814) 238-0490
WEB SITE
www.coilcraft.com
www.circuitprotection.com/magnetics.asp
www.murata.com
Sumida
USA: (847) 956-0702
Japan: 81(3) 3607-5144
(847) 803-6296
(847) 699-7864
www.sumida.com
TDK
TOKO
www.component.tdk.com
www.tokoam.com
Figure 6. Recommended Component Placement. Traces Carrying
High Current Should be Short and Wide. Trace Area at FB and V
C
Pins are Kept Low. Lead Length to Battery Should be Kept Short.
V
OUT
and V
IN
Ceramic Capacitors Close to the IC Pins.
Inductor Selection
The high frequency operation of the LTC3442 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
V
V
I
L
V
f
V
I
V
H
L
V
V
f
V
H
BOOST
IN MIN
(
OUT
IN MIN
(
OUT
–
BUCK
OUT
IN MAX
(
OUT
L
IN MAX
(
>
>
)
)
)
)
(
–
)
(
)
2
2
12
11
10
9
8
7
1
2
3
4
5
6
FB
V
C
R
LIM
V
IN
V
OUT
BURST
SHDN/SS
RT
SGND
SW1
PGND
SW2
V
IN
V
OUT
GND
R
T
MULTIPLE
VIAS
3442 F06
V
IN
where f = operating frequency, Hz
I
L
= maximum allowable inductor ripple current, A
V
IN(MIN)
= minimum input voltage, V
V
IN(MAX)
= maximum input voltage, V
V
OUT
= output voltage, V
I
OUT(MAX)
= maximum output load current
For high efficiency, choose a ferrite inductor with a high
frequency core material to reduce core loses. The inductor
should have low ESR (equivalent series resistance) to
reduce the I
2
R 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 1A to 2A 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 filter 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 =
I
V
V
C
V
OUT
OUT
% RIPPLE_BUCK =
I
V
V
C
V
V
OUT
INMAX
OUT
(
)
where C
OUT
= output filter capacitor in Farads and
f = switching frequency in Hz.
f
OUT MAX
(
OUT
INMIN
(
2
)
)
(
–
)
%
100
f
OUT MAX
(
INMAX
(
OUT
)
)
(
–
)
%
100
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| LTC3442EDE | Micropower Synchronous Buck-Boost DC/DC Converter with Automatic Burst Mode Operation |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC3442EDE | 制造商:Linear Technology 功能描述:Conv DC-DC Single Non-Inv/Inv/Step Up/Step Down 2.4V to 5.5V 12-Pin DFN EP |
| LTC3442EDE#PBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 12DFN 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(yè)面:1032 (CN2011-ZH PDF) 其它名稱:296-25628-2 |
| LTC3442EDE#TR | 制造商:Linear Technology 功能描述:Conv DC-DC Single Non-Inv/Inv/Step Up/Step Down 2.4V to 5.5V 12-Pin DFN EP T/R |
| LTC3442EDE#TRPBF | 功能描述:IC REG BUCK BOOST SYNC ADJ 12DFN 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 |
| LTC3443 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:High Current Micropower 600kHz Synchronous Buck-Boost DC/DC Converter |
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