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参数资料
| 型号： | LTC3411EMS#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/24页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 10MSOP |
| 标准包装： | 50 |
| 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： | 2.63 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 1.25A |
| 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-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 10-MSOP |
| 产品目录页面： | 1334 (CN2011-ZH PDF) |
LTC3411
APPLICATIONS INFORMATION
higher ripple current which causes this to occur at lower
load currents. This causes a dip in ef?ciency in the upper
range of low current operation. In Burst Mode operation,
lower inductance values will cause the burst frequency
to increase.
Inductor Core Selection
Different core materials and shapes will change the
size/current and price/current relationship of an induc-
tor. Toroid or shielded pot cores in ferrite or permalloy
materials are small and don’t radiate much energy, but
generally cost more than powdered iron core inductors
with similar electrical characteristics. The choice of which
style inductor to use often depends more on the price vs
size requirements and any radiated ?eld/EMI requirements
than on what the LTC3411 requires to operate. Table 1
shows some typical surface mount inductors that work
well in LTC3411 applications.
Table 1. Representative Surface Mount Inductors
Catch Diode Selection
Although unnecessary in most applications, a small
improvement in ef?ciency can be obtained in a few ap-
plications by including the optional diode D1 shown in
Figure 5, 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 diode peak cur-
rent 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 ef?ciency,
usually negating the possible bene?ts for LTC3411 circuits.
Another problem that a Schottky diode can introduce is
higher leakage current at high temperatures, which could
reduce the low current ef?ciency.
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.
MANU-
MAX DC
FACTURER PART NUMBER
VALUE CURRENT DCR HEIGHT
Input Capacitor (C IN ) Selection
Toko
Toko
Coilcraft
Coilcraft
Sumida
Sumida
A914BYW-2R2M-D52LC 2.2μH
A915AY-2ROM-D53LC 2μH
D01608C-222 2.2μH
LP01704-222M 2.2μH
CDRH4D282R2 2.2μH
CDC5D232R2 2.2μH
2.05A
3.3A
2.3A
2.4A
2.04A
2.16A
49mΩ 2mm
22mΩ 3mm
70mΩ 3mm
120mΩ 1mm
23mΩ 3mm
30mΩ 2.5mm
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:
Taiyo Yuden N06DB2R2M
Taiyo Yuden N05DB2R2M
Murata LQN6C2R2M04
2.2μH
2.2μH
2.2μH
3.2A
2.9A
3.2A
29mΩ 3.2mm
32mΩ 2.8mm
24mΩ 5mm
I RMS ≈ I MAX
V OUT ( V IN ? V OUT )
V IN
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10
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| LTC3411IDD#PBF | 功能描述:IC REG BUCK SYNC ADJ 1.25A 10DFN 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 |
| LTC3411IDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 1.25A 10DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
| LTC3411IMS#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:- 设计资源:Design Support Tool 标准包装:1 系列:- 类型:升压（升压） 输出类型:固定 输出数:1 输出电压:3V 输入电压:0.75 V ~ 2 V PWM 型:- 频率 - 开关:- 电流 - 输出:100mA 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:SOT-23-5 细型，TSOT-23-5 包装:剪切带 (CT) 供应商设备封装:TSOT-23-5 其它名称:AS1323-BTTT-30CT |
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| LTC3412 | 制造商:LINER 制造商全称:Linear Technology 功能描述:8A, 4MHz, Monolithic Synchronous Step-Down Regulator |
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