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| 型号： | LTC3440EDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK BOOST SYNC ADJ 10DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 2.5 V ~ 5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | Burst Mode? |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LTC3440
APPLICATIO S I FOR ATIO
Ripple = allowable inductor current ripple
(e.g., 0.2 = 20%)
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 an inductor with a high fre-
quency core material, such as ferrite, 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 toroid, pot core
or shielded bobbin inductor. See Table 1 for suggested
components and Table 2 for a list of component suppliers.
Table 1. Inductor Vendor Information
The output capacitance is usually many times larger in
order to handle the transient response of the converter.
For a rule of thumb, the ratio of the operating frequency to
the unity-gain bandwidth of the converter is the amount
the output capacitance will have to increase from the
above calculations in order to maintain the desired tran-
sient response.
The other component of ripple is due to the ESR (equiva-
lent series resistance) of the output capacitor. Low ESR
capacitors should be used to minimize output voltage
ripple. For surface mount applications, Taiyo Yuden ce-
ramic capacitors, AVX TPS series tantalum capacitors or
Sanyo POSCAP are recommended.
Input Capacitor Selection
Since the V IN pin is the supply voltage for the IC it is
recommended to place at least a 4.7 μ F, low ESR bypass
capacitor.
SUPPLIER
PHONE
FAX
WEB SITE
Table 2. Capacitor Vendor Information
Coilcraft
Coiltronics
Murata
(847) 639-6400
(561) 241-7876
USA:
(814) 237-1431
(847) 639-1469
(561) 241-9339
USA:
(814) 238-0490
www.coilcraft.com
www.coiltronics.com
www.murata.com
SUPPLIER
AVX
Sanyo
PHONE
(803) 448-9411
(619) 661-6322
FAX
(803) 448-1943
(619) 661-1055
WEB SITE
www.avxcorp.com
www.sanyovideo.com
Sumida
(800) 831-9172
USA: www.japanlink.com/
Taiyo Yuden (408) 573-4150
(408) 573-4159
www.t-yuden.com
I OUT ( MAX ) ? ( V OUT IN ( MIN ) ) ? 100
% Ripple _ Boost = %
C OUT ? V OUT ? f
I OUT ( MAX ) ? ( V IN ( MAX ) – V OUT ) ? 100
(847) 956-0666 (847) 956-0702 sumida
Japan:
81(3) 3607-5111 81(3) 3607-5144
Output Capacitor Selection
The bulk value of the 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:
– V
2
% Ripple _ Buck = %
C OUT ? V IN ( MAX ) ? V OUT ? f
Optional Schottky Diodes
To achieve a 1%-2% efficiency improvement above 50mW,
Schottky diodes can be added across synchronous switches
B (SW1 to GND) and D (SW2 to V OUT ). The Schottky
diodes will provide a lower voltage drop during the break-
before-make time (typically 15ns) of the NMOS to PMOS
transition. General purpose diodes such as a 1N914 are
not recommended due to the slow recovery times and will
compromise efficiency. If desired a large Schottky diode,
such as an MBRM120T3, can be used from SW2 to V OUT .
A low capacitance Schottky diode is recommended
from GND to SW1 such as a Phillips PMEG2010EA or
equivalent.
where C OUT = output filter capacitor, F
3440fb
12
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相关代理商/技术参数 |
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| LTC3440EMS | 功能描述:IC REG BUCK BST SYNC 0.6A 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3440EMS#PBF | 功能描述:IC REG BUCK BST SYNC 0.6A 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V 输入电压:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 同步整流器:是 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3440EMS#TR | 功能描述:IC REG BUCK BST SYNC 0.6A 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3440EMS#TRPBF | 功能描述:IC REG BUCK BST SYNC 0.6A 10MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
| LTC3440EMSPBF | 制造商:Linear Technology 功能描述:LTC3440 adj 600mA SU/SD dc-dc converter |
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