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| 型号： | LTC3411AEDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1.25A 10DFN |
| 标准包装： | 121 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.5MHz |
| 电流 - 输出： | 1.25A |
| 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-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-DFN（3x3） |
LTC3411A
APPLICATIONS INFORMATION
shows some typical surface mount inductors that work
well in LTC3411A applications.
Table 1. Representative Surface Mount Inductors
MANU- MAX DC
FACTURER PART NUMBER VALUE CURRENT DCR HEIGHT
Toko A914BYW-1R2M=P3: 1.2μH 2.15A 44mΩ 2mm
D52LC
diode peak current and average power dissipation so as
not to exceed the diode ratings. The main problem with
Schottky diodes is that their parasitic capacitance reduces
the efficiency, usually negating the possible benefits for
LTC3411A circuits. Another problem that a Schottky diode
can introduce is higher leakage current at high tempera-
tures, which could reduce the low current efficiency.
A960AW-1R2M=P3: 1.2μH
D518LC
DB3015C-1068AS-1R0N 1.0μH
DB3018C-1069AS-1R0N 1.0μH
1.8A
2.1A
2.1A
46mΩ 1.8mm
43mΩ 1.5mm
45mΩ 1.8mm
Remember to keep lead lengths short and observe proper
grounding (see Board Layout Considerations) to avoid ring-
ing and increased dissipation when using a catch diode.
Coilcraft
Sumida
DB3020C-1070AS-1R0N 1.0μH
A914BYW-2R2M-D52LC 2.2μH
A915AY-2ROM-D53LC 2.0μH
LPO1704-122ML 1.2μH
D01608C-222 2.2μH
LP01704-222M 2.2μH
CR32-1R0 1.0μH
CR5D11-1R0 1.0μH
2.1A
2.05A
3.3A
2.1A
2.3A
2.4A
2.1A
2.2A
47mΩ 2mm
49mΩ 2mm
22mΩ 3mm
80mΩ 1mm
70mΩ 3mm
120mΩ 1mm
72mΩ 3mm
40mΩ 1.2mm
Input Capacitor (C IN ) Selection
In continuous mode, the input current of the converter is a
square wave with a duty cycle of approximately V OUT /V IN .
To prevent large voltage transients, a low equivalent series
resistance (ESR) input capacitor sized for the maximum
RMS current must be used. The maximum RMS capacitor
current is given by:
CDRH3D14-1R2
CDRH4D18C/LD-1R1
CDRH4D28C/LD-1R0
1.2μH
1.1μH
1.0μH
2.2A
2.1A
3.0A
36mΩ 1.5mm
24mΩ 2mm
17.5mΩ 3mm
I RMS ≈ I MAX
V OUT (V IN ? V OUT )
V IN
CDRH4D28C-1R1 1.1μH 3.8A 22mΩ 3mm
CDRH4D28-1R2 1.2μH 2.56A 23.6mΩ 3mm
CDRH6D12-1R0 1.0μH 2.80A 37.5mΩ 1.5mm
CDRH4D282R2 2.2μH 2.04A 23mΩ 3mm
CDC5D232R2 2.2μH 2.16A 30mΩ 2.5mm
Taiyo Yuden NPO3SB1ROM 1.0μH 2.6A 27mΩ 1.8mm
N06DB2R2M 2.2μH 3.2A 29mΩ 3.2mm
N05DB2R2M 2.2μH 2.9A 32mΩ 2.8mm
Murata LQN6C2R2M04 2.2μH 3.2A 24mΩ 5mm
FDK MIPW3226DORGM 0.9μH 1.4A 80mΩ 1mm
Catch Diode Selection
Although unnecessary in most applications, a small
improvement in efficiency can be obtained in a few ap-
plications by including the optional diode D1 shown in
Figure 4, which conducts when the synchronous switch
is off. When using Burst Mode operation or pulse skip
mode, the synchronous switch is turned off at a low
current and the remaining current will be carried by the
optional diode. It is important to adequately specify the
where the maximum average output current I MAX equals
the peak current minus half the peak-to-peak ripple current,
I MAX = I LIM – Δ I L /2.
This formula has a maximum at V IN = 2V OUT , where
I RMS ? I OUT /2. This simple worst case is commonly used
to design because even significant deviations do not offer
much relief. Note that capacitor manufacturer’s ripple cur-
rent ratings are often based on only 2000 hours lifetime.
This makes it advisable to further derate the capacitor,
or choose a capacitor rated at a higher temperature than
required. Several capacitors may also be paralleled to meet
the size or height requirements of the design. An additional
0.1μF to 1μF ceramic capacitor is also recommended on
V IN for high frequency decoupling, when not using an all
ceramic capacitor solution.
Output Capacitor (C OUT ) Selection
The selection of C OUT is driven by the required ESR to
minimize voltage ripple and load step transients. Typically,
once the ESR requirement is satisfied, the capacitance
3411afc
For more information www.linear.com/LTC3411A
11
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3411AEDD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.25A, 4MHz, Synchronous Step-Down DC/DC Converter |
| LTC3411AEMS#PBF | 功能描述:IC REG BUCK SYNC ADJ 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC3411AEMS#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 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:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC3411AEMS-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.25A, 4MHz, Synchronous Step-Down DC/DC Converter |
| LTC3411AEMS-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.25A, 4MHz, Synchronous Step-Down DC/DC Converter |
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