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參數(shù)資料
| 型號(hào)： | LT1618 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Constant-Current/ Constant-Voltage 1.4MHz Step-Up DC/DC Converter(恒定電流/恒定電壓，1.4MHz,步升DC/DC變換器) |
| 中文描述： | 恒定電流/恒定電壓1.4MHz的升壓型DC / DC轉(zhuǎn)換器（恒定電流/恒定電壓，1.4MHz的，步升直流/直流變換器） |
| 文件頁(yè)數(shù)： | 6/12頁(yè) |
| 文件大?。?/td> | 204K |
| 代理商： | LT1618 |
LT1618
6
Capacitor Selection
Low ESR (equivalent series resistance) capacitors should
be used at the output to minimize the output ripple voltage.
Multilayer ceramic capacitors are an excellent choice.
They have an extremely low ESR and are available in very
small packages. X5R and X7R dielectrics are preferred, as
these materials retain their capacitance over wider voltage
and temperature ranges than other dielectrics. A 4.7
μ
F to
10
μ
F output capacitor is sufficient for high output current
designs. Converters with lower output currents may need
only a 1
μ
F or 2.2
μ
F output capacitor. Solid tantalum or
OSCON capacitors can be used, but they will occupy more
board area than a ceramic and will have a higher ESR
APPLICATIO
S I
N
FOR
ATIO
U
W
U
Inductor Selection
Several inductors that work well with the LT1618 are listed
in Table 1, although there are many other manufacturers
and devices that can be used. Consult each manufacturer
for more detailed information and for their entire selection
of related parts. Many different sizes and shapes are
available. Ferrite core inductors should be used to obtain
the best efficiency, as core losses at 1.4MHz are much
lower for ferrite cores than for the cheaper powdered-iron
ones. Choose an inductor that can handle the necessary
peak current without saturating, and ensure that the
inductor has a low DCR (copper-wire resistance) to mini-
mize I
2
R power losses. A 4.7
μ
H or 10
μ
H inductor will be
a good choice for many LT1618 designs.
Table 1. Recommended Inductors
L
MAX
(m
)
57
124
71
109
182
100
78
126
260
HEIGHT
(mm)
2.0
2.0
3.5
3.5
3.5
4.8
2.0
2.0
2.0
PART
CDRH5D18-4R1
CDRH5D18-100
CR43-2R2
CR43-4R7
CR43-100
CR54-100
LQH3C1R0M24
LQH3C2R2M24
LQH3C4R7M24
(
μ
H)
4.1
10
2.2
4.7
10
10
1.0
2.2
4.7
VENDOR
Sumida
(847) 956-0666
www.sumida.com
Murata
(814) 237-1431
www.murata.com
forthe same footprint device. Always use a capacitor with
a sufficient voltage rating.
Ceramic capacitors also make a good choice for the input
decoupling capacitor, which should be placed as close as
possible to the V
IN
pin of the LT1618. A 1
μ
F to 4.7
μ
F input
capacitor is sufficient for most applications. Table 2 shows
a list of several ceramic capacitor manufacturers. Consult
the manufacturers for detailed information on their entire
selection of ceramic parts.
Table 2. Recommended Ceramic Capacitor Manufacturers
VENDOR
PHONE
Taiyo Yuden
(408) 573-4150
Murata
(714) 852-2001
Kemet
(408) 986-0424
URL
www.t-yuden.com
www.murata.com
www.kemet.com
Diode Selection
Schottky diodes, with their low forward voltage drop and
fast switching speed, are the ideal choice for LT1618
applications. Table 3 shows several Schottky diodes that
work well with the LT1618. Many different manufacturers
make equivalent parts, but make sure that the component
chosen has a sufficient current rating and a voltage rating
greater than the output voltage. The diode conducts cur-
rent only when the power switch is turned off (typically
less than half the time), so a 0.5A or 1A diode will be
sufficient for most designs. The companies below also
offer Schottky diodes with higher voltage and current
ratings.
Table 3. Recommended Schottky Diodes
1A PART
0.5A PART
UPS120
UPS130
UPS140
MBRM120
MBR0520
MBRM130
MBR0530
MBRM140
MBR0540
B120
B0520
B130
B0530
B140
B0540
VENDOR
Microsemi
PHONE/URL
(510) 353-0822
www.microsemi.com
ON Semiconductor
(800) 282-9855
www.onsemi.com
Diodes, Inc
(805) 446-4800
www.diodes.com
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參數(shù)描述 |
|---|---|
| LT1618_1 | 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:Constant-Current/Constant-Voltage 1.4MHz Step-Up DC/DC Converter |
| LT1618EDD | 功能描述:IC REG BOOST ADJ 1.5A 10DFN RoHS:否 類(lèi)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:500 系列:- 類(lèi)型:切換式電容器（充電泵），反相 輸出類(lèi)型:固定 輸出數(shù):1 輸出電壓:-3V 輸入電壓:2.3 V ~ 5.5 V PWM 型:Burst Mode? 頻率 - 開(kāi)關(guān):900kHz 電流 - 輸出:100mA 同步整流器:無(wú) 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:SOT-23-6 細(xì)型，TSOT-23-6 包裝:帶卷 (TR) 供應(yīng)商設(shè)備封裝:TSOT-23-6 其它名稱(chēng):LTC1983ES6-3#TRMTR |
| LT1618EDD#PBF | 功能描述:IC REG BOOST ADJ 1.5A 10DFN RoHS:是 類(lèi)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:250 系列:- 類(lèi)型:降壓（降壓） 輸出類(lèi)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(kāi)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(lèi)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(chēng):296-25628-2 |
| LT1618EDD#TR | 功能描述:IC REG BOOST ADJ 1.5A 10DFN RoHS:否 類(lèi)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(lèi)型:升壓（升壓） 輸出類(lèi)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(lèi)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 |
| LT1618EDD#TRPBF | 功能描述:IC REG BOOST ADJ 1.5A 10DFN RoHS:是 類(lèi)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(lèi)型:升壓（升壓） 輸出類(lèi)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(lèi)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 |
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