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| 型号： | LTC3417AIFE-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ DL 20TSSOP |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 输出电压： | 0.8 V ~ 5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.5MHz，600kHz ~ 4MHz |
| 电流 - 输出： | 1A，1.5A |
| 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： | 20-TSSOP（0.173"，4.40mm 宽）裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-TSSOP-EP |
LTC3417A-1
APPLICATIONS INFORMATION
A reasonable starting point for setting ripple current is
Δ I L = 0.35I LOAD(MAX) , where I LOAD(MAX) is the maximum
current output. The largest ripple, Δ I L , occurs at the maxi-
mum input voltage. To guarantee that the ripple current
stays below a speci?ed maximum, the inductor value
should be chosen according to the following equation:
typical surface mount inductors that work well in
LTC3417A-1 applications.
Input Capacitor (C IN ) Selection
In continuous mode, the input current of the converter can
be approximated by the sum of two square waves with
L =
V OUT
f O ? I L
1–
V OUT
V IN(MAX)
duty cycles of approximately V OUT1 /V IN and V OUT2 /V IN . To
prevent large voltage transients, a low equivalent series
resistance (ESR) input capacitor sized for the maximum
The inductor value will also have an effect on Burst Mode
operation. The transition from low current operation begins
when the peak inductor current falls below a level set by the
burst clamp. Lower inductor values result in 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 inductor
values will cause the burst frequency to increase.
Inductor Core Selection
Different core materials and shapes will change the size/
current relationship of an inductor. 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
RMS current must be used. Some capacitors have a
de-rating spec for maximum RMS current. If the capaci-
tor being used has this requirement, it is necessary to
calculate the maximum RMS current. The RMS current
calculation is different if the part is used in “in phase” or
“out of phase”.
For “in phase”, there are two different equations:
V OUT1 > V OUT2 :
I RMS = 2 ?I 1 ?I 2 ? D2(1– D1) + I 2 2 (D2 – D2 2 ) + I 12 (D1– D1 2 )
V OUT2 > V OUT1 :
I RMS = 2 ?I 1 ?I 2 ? D1(1– D2) + I 2 2 (D2 – D2 2 ) + I 12 (D1– D1 2 )
where:
and D2 = OUT2
often depends more on the price vs size requirements
of any radiated ?eld/EMI requirements than on what the
LTC3417A-1 requires to operate. Table 1 shows some
D1 =
V OUT1
V IN
V
V IN
Table 1
MANUFACTURER
PART NUMBER
VALUE (μH)
MAX DC CURRENT (A)
DCR
DIMENSIONS L × W × H (mm)
L1 on OT1
Toko
Coilcraft
Sumida
Midcom
A920CY-1R5M-D62CB
A918CY-1R5M-D62LCB
D01608C-152ML
CDRH4D22/HP 1R5
DUP-1813-1R4R
1.5
1.5
1.5
1.5
1.4
2.8
2.9
2.6
3.9
5.5
0.014
0.018
0.06
0.031
0.033
6 × 6 × 2.5
6 × 6 × 2
6.6 × 4.5 × 2.9
5 × 5 × 2.4
4.3 × 4.8 × 3.5
L2 on OUT2
Toko
Coilcraft
Sumida
Midcom
A915AY-2ROM-D53LC
D01608C-222ML
CDRH3D16/HP 2R2
DUP-1813-2R2R
2.0
2.2
2.2
2.2
2.2
3.9
2.3
1.75
1.6
3.9
0.027
0.07
0.047
0.035
0.047
5 × 5 × 3
6.6 × 4.5 × 2.9
4 × 4 × 1.8
3.2 × 3.2 × 2
4.3 × 4.8 × 3.5
3417a1fa
10
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相关代理商/技术参数 |
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|---|---|
| LTC3417AIFE-2#PBF | 功能描述:IC REG BUCK SYNC ADJ DL 20TSSOP 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 |
| LTC3417AIFE-2#TRPBF | 功能描述:IC REG BUCK SYNC ADJ DL 20TSSOP 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 |
| LTC3417AIFE-2-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous 1.5A/1A 4MHz Step-Down DC/DC Regulator |
| LTC3417AIFE-2-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous 1.5A/1A 4MHz Step-Down DC/DC Regulator |
| LTC3417AIFEPBF | 制造商:Linear Technology 功能描述:Conv DC-DC Dual Step-Down 5.5V TSSOP20EP |
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