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参数资料
| 型号： | LTC3543EDCB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 11/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 8DFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz |
| 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： | 8-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-DFN（3x2） |
LTC3543
APPLICATIONS INFORMATION
? ? 1 ? OUT ?
Δ I L =
The basic LTC3543 application circuit is shown on the
front page of this data sheet. External component selec-
tion is driven by the load requirement and begins with the
selection of L followed by C IN and C OUT .
Inductor Selection
For most applications, the value of the inductor will fall
in the range of 1μH to 4.7μH. Its value is chosen based
on the desired ripple current. Large value inductors
lower ripple current, and small value inductors result in
higher ripple currents. Higher V IN or V OUT also increases
the ripple current, as shown in Equation 1. A reasonable
starting point for setting ripple current is Δ I L = 130mA
20% I LOAD(MAX) .
V OUT ? V ?
f ? L ? V IN ? (1)
The DC current rating of the inductor should be at least equal
to the maximum load current plus half the ripple current
to prevent core saturation. Thus, a 665mA rated induc-
tor should be enough for most applications (600mA +
65mA). For better ef?ciency, choose a low DC-resistance
inductor.
Table 1. Representative Surface Mount Inductors
The inductor value also has an effect on Burst Mode opera-
tion. The transition to low current operation begins when
the inductor current peaks fall to approximately 100mA.
Lower inductor values (higher Δ I L ) will cause this to occur
at lower load currents, which can cause 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 do not radiate much en-
ergy, 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 re-
quirements, than on what the LTC3543 requires to operate.
Table 1 shows some typical surface mount inductors that
work well in LTC3543 applications.
MANUFACTURER
TDK
Sumida
Taiyo Yuden
CoEv
Murata
PART NUMBER
VLF3010AT-2R2M1R0
VLF3012AT-2R2M1R0
VLCF4020T-2R2N1R7
VLCF5020-2R7N1R7
VLCF5020-3R3N1R6
VLCF5020-4R7N1R4
CDRH2D18/HP-2R2NC
NR4018T4R7M
NP03SB4R7M
DN4835-2R2
DN4835-3R3
DN4835-6R8
LQH32CN2R2M33
LQH55DN2R2M03
LQH55DN3R3M03
LQH55DN4R7M0 3
VALUE (μH)
2.2
2.2
2.2
2.7
3.3
4.7
2.2
4.7
4.7
2.2
3.3
6.8
2.2
2.2
3.3
4.7
MAX DC CURRENT (A)
1.0
1.0
1.7
1.7
1.6
1.4
1.6
1.7
1.2
2.6
2.43
1.41
0.79
3.2
2.9
2.7
DCR (m Ω )
100
88
54
58
69
79
48
90
47
47
58
117
97
29
36
41
HEIGHT (mm)
1.0
1.2
2.0
2.0
2.0
2.0
2.0
1.8
1.8
3.5
3.5
3.5
3.2
4.7
4.7
4.7
3543fa
11
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相关代理商/技术参数 |
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| LTC3544BEUD#PBF | 功能描述:IC REG BUCK SYNC ADJ QUAD 16QFN 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 |
| LTC3544BEUD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ QUAD 16QFN 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 |
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