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参数资料
| 型号： | LTC3545EUD-1#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/20页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.8A 16QFN |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 3 |
| 输出电压： | 0.6 V ~ 5.5 V |
| 输入电压： | 2.25 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 800mA |
| 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： | 16-WFQFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 16-QFN-EP（3x3） |
LTC3545/LTC3545-1
APPLICATIONS INFORMATION
The basic LTC3545/LTC3545-1 application circuit is shown
Table 1. Representative Surface Mount Inductors
on the ?rst page of this data sheet. External component
selection 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 10μH. Its value is chosen based on the
desired ripple current. Large inductor values lower ripple
current and small inductor values 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 for an 800mA regulator is
Δ I L = 320mA (40% of 800mA).
PART
NUMBER
Wurth WE-
TPC 744031
CoilCraft
LPS4012
Sumida
CDH38D11/
SLD
Sumida
CDRH3D16
VALUE
(μH)
1.5
2.5
3.6
1
1.5
2.2
3.3
1.4
2.4
3.6
1.5
2.2
3.3
DCR
( Ω MAX)
0.035
0.045
0.065
0.06
0.07
0.1
0.1
0.055
0.094
0.13
0.043
0.075
0.11
MAX DC
CURRENT (A)
1.75
1.45
1.38
2.5
2.5
2.1
1.5
1.8
1.3
1.1
1.55
1.2
1.1
W × L × H (mm 3 )
3.8 × 3.8 × 1.65
4.0 × 4.0 × 1.1
4.0 × 4.0 × 1.2
3.8 × 3.8 × 1.8
Δ I L OUT ? 1 – OUT ?
=
( ? )( L )
V
1 ? V ?
? V IN ?
(1)
C IN and C OUT Selection
In continuous mode, a worst-case estimate for the input
current ripple can be determined by assuming that the
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 960mA rated inductor
should be enough for most applications (800mA + 160mA).
For better ef?ciency, choose a low DCR inductor.
source current of the top MOSFET is a square wave of
duty cycle V OUT /V IN , and amplitude I OUT(MAX) . To prevent
large voltage transients, a low ESR input capacitor sized for
the maximum RMS current must be used. The maximum
RMS capacitor current is given by:
Inductor Core Selection
Different core materials and shapes will change the
I RMS ? I OUT ( MAX )
V OUT ( V IN – V OUT )
V IN
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 LTC3545/LTC3545-1 require to operate.
Table 1 shows typical surface mount inductors that work
This formula has a maximum at V IN = 2V OUT , where I RMS
= I OUT /2. This simple worst-case condition is commonly
used for design. Note that the capacitor manufacturer’s
ripple current ratings are often based on 2000 hours of
life (non-ceramic capacitors). This makes it advisable to
further de-rate the capacitor, or choose a capacitor rated
at a higher temperature than required. Always consult the
manufacturer if there is any question.
well in LTC3545/LTC3545-1 applications.
35451fb
12
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3545EUDPBF | 制造商:Linear Technology 功能描述:Conv DC-DC Triple Step-Down 5.5V QFN16EP |
| LTC3545EUD-PBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Triple 800mA Synchronous Step-Down Regulator-2.25MHz |
| LTC3545EUD-TRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Triple 800mA Synchronous Step-Down Regulator-2.25MHz |
| LTC3545IUD#PBF | 功能描述:IC REG BUCK SYNC ADJ 0.8A 16QFN 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 |
| LTC3545IUD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.8A 16QFN 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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