- 您现在的位置：买卖IC网 > PDF目录14862 > LTC3547EDDB#TRMPBF (Linear Technology)IC REG BUCK SYNC ADJ .3A DL 8DFN PDF资料下载
参数资料
| 型号： | LTC3547EDDB#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ .3A DL 8DFN |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 2 |
| 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 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 300mA |
| 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： | 标准包装 |
| 供应商设备封装： | 8-DFN（3x2） |
| 产品目录页面： | 1335 (CN2011-ZH PDF) |
| 其它名称： | LTC3547EDDB#TRMPBFDKR |
LTC3547
APPLICATIO S I FOR ATIO
A general LTC3547 application circuit is shown in
Figure 1. External component selection is driven by the
load requirement, and begins with the selection of the
inductor L. Once the inductor is chosen, C IN and C OUT
can be selected.
Inductor Selection
Although the inductor does not in?uence the operat-
ing frequency, the inductor value has a direct effect on
ripple current. The inductor ripple current Δ I L decreases
with higher inductance and increases with higher V IN
or V OUT :
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 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 LTC3547 requires to operate. Table 1
shows some typical surface mount inductors that work
well in LTC3547 applications.
? I L = OUT ? ? 1 ? OUT ?
V ? V ?
f O ? L ? V IN ?
(1)
Table 1. Representative Surface Mount Inductors
MANU- MAX DC
Accepting larger values of Δ I L allows the use of low
inductances, but results in higher output voltage ripple,
FACTURER
Taiyo Yuden
PART NUMBER
CB2016T2R2M
CB2012T2R2M
VALUE CURRENT
2.2μH 510mA
2.2μH 530mA
DCR HEIGHT
0.13 Ω 1.6mm
0.33 Ω 1.25mm
greater core losses, and lower output current capability.
CB2016T3R3M
3.3μH
410mA
0.27 Ω
1.6mm
A reasonable starting point for setting ripple current
is 40% of the maximum output load current. So, for a
300mA regulator, Δ I L = 120mA (40% of 300mA).
The inductor value will also have an effect on Burst Mode
operation. The transition to low current operation begins
when the peak inductor current falls below a level set by
the internal burst clamp. Lower inductor values result in
higher ripple current which causes the transition to occur
at lower load currents. This causes a dip in ef?ciency in
the upper range of low current operation. Furthermore,
lower inductance values will cause the bursts to occur
with increased frequency.
Panasonic
Sumida
Murata
Taiyo Yuden
FDK
TDK
ELT5KT4R7M
CDRH2D18/LD
LQH32CN4R7M23
NR30102R2M
NR30104R7M
FDKMIPF2520D
FDKMIPF2520D
FDKMIPF2520D
VLF3010AT4R7-
MR70
VLF3010AT3R3-
MR87
VLF3010AT2R2-
M1RD
4.7μH
4.7μH
4.7μH
2.2μH
4.7μH
4.7μH
3.3μH
2.2μH
4.7μH
3.3μH
2.2μH
950mA
630mA
450mA
1100mA
750mA
1100mA
1200mA
1300mA
700mA
870mA
1000mA
0.2 Ω
0.086 Ω
0.2 Ω
0.1 Ω
0.19 Ω
0.11 Ω
0.1 Ω
0.08 Ω
0.24 Ω
0.17 Ω
0.12 Ω
1.2mm
2mm
2mm
1mm
1mm
1mm
1mm
1mm
1mm
1mm
1mm
V IN
2.5V TO 5.5V
C1
RUN2 V IN RUN1
L2
LTC3547
L1
V OUT2
C F2
SW2
SW1
C F1
V OUT1
C OUT2
R4
R3
V FB2
GND
V FB1
R1
R2
C OUT1
3547 F01
Figure 1. LTC3547 General Schematic
3547fa
8
相关PDF资料 |
PDF描述 |
|---|---|
| VI-25Z-EY-F3 | CONVERTER MOD DC/DC 2V 20W |
| MAX6465XR34+T | IC VOLT DETECTOR LP SC70-3 |
| VI-25Z-EW-F3 | CONVERTER MOD DC/DC 2V 40W |
| LTC3528EDDB#TRMPBF | IC REG BOOST SYNC ADJ 1A 8DFN |
| RBM06DRMD-S664 | CONN EDGECARD 12POS .156 WW |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3548 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous,400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
| LTC3548-1 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, Fixed Output 2.25MHz Step-Down DC/DC Regulator |
| LTC3548-2 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous, Fixed/Adjustable Output, 2.25MHz Step-Down DC/DC Regulator |
| LTC3548A | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
| LTC3548AEDD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Synchronous 400mA/800mA, 2.25MHz Step-Down DC/DC Regulator |
发布紧急采购，3分钟左右您将得到回复。