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參數(shù)資料
| 型號(hào)： | LTC3423 |
| 廠商： | Linear Integrated Systems |
| 英文描述： | Low Output Voltage 3MHz Micropower Synchronous Boost Converters |
| 中文描述： | 低輸出電壓3MHz的微功率同步升壓轉(zhuǎn)換器 |
| 文件頁(yè)數(shù)： | 8/12頁(yè) |
| 文件大?。?/td> | 203K |
| 代理商： | LTC3423 |
8
LTC3423/LTC3424
34234f
APPLICATIOU
The inductor current ripple is typically set to 20% to 40%
of the maximum inductor current.
For high efficiency, choose an inductor with a high fre-
quency core material, such as ferrite, to reduce core
losses. 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 at full load without
saturating. Molded chokes or chip inductors usually do
not have enough core to support the peak inductor cur-
rents in the 1A to 2A region. To minimize radiated noise,
use a toroid, pot core or shielded bobbin inductor. See
Table 1 for a list of component suppliers.
W
U
U
Figure 1. Recommended Component Placement. Traces
Carrying High Current Are Direct. Trace Area FB and V
C
Pins
Are Kept Low. Lead Length to Battery Should be Kept Short
where
I
L
= Average Inductor Current
I
P
= Peak Inductor Current
The ESR is usually the most dominant factor for ripple in
most power converters. The ripple due to capacitor ESR is
simply given by:
VR
CESR
= I
P
R
ESR
Volts
where
R
ESR
= Capacitor Series Resistance
Low ESR capacitors should be used to minimize output
voltage ripple. For surface mount applications, AVX TPS
series tantalum capacitors and Sanyo POSCAP or Taiyo-
Yuden ceramic capacitors are recommended. For through-
hole applications Sanyo OS-CON capacitors offer low ESR
in a small package size. See Table 2 for a list of component
suppliers.
In some layouts it may be required to place a 1
μ
F low ESR
capacitor as close to the V
OUT
and GND pins as possible.
Table 1. Inductor Vendor Information
SUPPLIER
PHONE
Coilcraft
(847) 639-6400
Coiltronics
(516) 241-7876
Murata
(814) 237-1431
(800) 831-9172
Sumida
USA: (847) 956-0666
Japan: 81-3-3607-5111 81-3-3607-5144
FAX
(847) 639-1469
(516) 241-9339
(814) 238-0490
WEBSITE
www.coilcraft.com
www.coiltronics.com
www.murata.com
(847) 956-0702
www.japanlink.com
sumida
V
OUT
3423/24 F01
R
MODE
V
IN
SW
GND
SHDN
V
C
FB
V
OUT
V
DD
V
IN
2.7V
TO 5.5V
Output Capacitor Selection
The output voltage ripple has several components. The
bulk value of the capacitor is set to reduce the ripple due
to charge into the capacitor each cycle. The max ripple due
to charge is given by:
VR
I
V V
V
V
C
V
f
BULK
L
OUT
IN
OUT
OUT
OUT
=
(
–
)
Volts
Table 2. Capacitor Vendor Information
SUPPLIER
PHONE
AVX
(803) 448-9411
Sanyo
(619) 661-6322
Taiyo Yuden
(408) 573-4150
FAX
(803) 448-1943
(619) 661-1055
(408) 573-4159
WEBSITE
www.avxcorp.com
www.sanyovideo.com
www.t-yuden.com
Input Capacitor Selection
The input filter capacitor reduces peak currents drawn from
the input source and reduces input switching noise. In most
applications a 3.3
μ
F is sufficient.
Output Diode
The Schottky diode across the synchronous PMOS switch
is not required, but provides a lower drop during the break-
before-make time (typically 20ns) of the NMOS to PMOS
transition. The addition of the Schottky diode will improve
peak efficiency (see graph “Efficiency Loss Without
Schottky vs Frequency”). Use of a Schottky diode such as
a MBRM120T3, 1N5817 or equivalent. Since slow recov-
ery times will compromise efficiency, do not use ordinary
rectifier diodes.
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| LTC3423EMS | 功能描述:IC REG BOOST SYNC ADJ 1A 10MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)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(kāi)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(pán)，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(yè)面:1094 (CN2011-ZH PDF) 其它名稱:576-3303-2 |
| LTC3423EMS#PBF | 功能描述:IC REG BOOST SYNC ADJ 1A 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)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(kāi)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(pán)，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(yè)面:1094 (CN2011-ZH PDF) 其它名稱:576-3303-2 |
| LTC3423EMS#TR | 功能描述:IC REG BOOST SYNC ADJ 1A 10MSOP RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 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(yīng)商設(shè)備封裝:8-SOIC |
| LTC3423EMS#TRPBF | 功能描述:IC REG BOOST SYNC ADJ 1A 10MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開(kāi)關(guān)穩(wěn)壓器 系列:- 標(biāo)準(zhǔn)包裝:2,500 系列:- 類型:升壓（升壓） 輸出類型:可調(diào)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(kāi)關(guān):600kHz 電流 - 輸出:500mA 同步整流器:無(wú) 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(yīng)商設(shè)備封裝:8-SOIC |
| LTC3424 | 制造商:LINEAR 制造商全稱:LINEAR 功能描述:Low Output Voltage 3MHz Micropower Synchronous Boost Converters |
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