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| 型号： | LTC3549EDCB#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.25A 6DFN |
| 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： | 0.61 V ~ 5.5 V |
| 输入电压： | 1.6 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 2.25MHz |
| 电流 - 输出： | 250mA |
| 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-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 6-DFN-EP（2x3） |
LTC3549
APPLICATIO S I FOR ATIO
Design Example
As a design example, assume the LTC3549 is used in a
Substituting V OUT = 1.5V, V IN = 3.1V, Δ I L = 100mA and
f = 2.25MHz in Equation 3 gives:
1 . 5 ? 1 –
2-alkalinecellbattery-poweredapplication.TheV IN willbe
operating from a maximum of 3.1V down to about 1.8V.
The load current requirement is a maximum of 250mA
L =
1
2 . 25 MHz ? 100 mA
?
?
1 . 5 ?
3 . 1 ? ?
? 3 . 3 μ H
but most of the time it will be in standby mode, requiring
only 2mA. Ef?ciency at both low and high load currents
is important. Output voltage is 1.5V. With this information
we can calculate L using Equation 3:
For best ef?ciency choose a 350mA or greater inductor
with less than 0.3 Ω series resistance. C IN will require an
RMS current rating of at least 0.125A ? I LOAD(MAX) /2 at
temperature.
? ? 1 – V
f ? ? I L
IN ?
L =
V OUT ? V OUT ?
?
(3)
For the feedback resistors, choose R2 = 137k. Then, from
Equation 3, R1 is 200k. Figure 4 shows the complete circuit
along with its ef?ciency curve.
L1
V IN
1.8V TO
3.1V
C IN
4.7 μ F
CERAMIC
RUN SW
LTC3549
3.3 μ H*
CL
22pF
C OUT
4.7 μ F
V OUT
1.5V
V IN
R1
CERAMIC
MODE
GND
*TDK VLF3012AT-3R3MR87
V FB
200k
R2
137k
3549 F04a
Figure 4a. High Ef?ciency Step-Down Regulator
100
90
80
70
60
50
40
30
V IN = 1.8
V IN = 2.5
V IN = 3.1
V OUT
100mV/DIV
AC COUPLED
I LOAD
200mA/DIV
I L
200mA/DIV
20
10
V IN = 2.5V
20 μ s/DIV
3549 F04c
0
0.1
1
10 100
1000
V OUT = 1.5V
I LOAD = 100mA to 250mA
LOAD CURRENT (mA)
3549 F04b
Figure 4b. Burst Mode Ef?ciency, V OUT = 1.5V
Figure 4c. Load Step Response
3549f
14
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| LTC3550EDHC#PBF | 功能描述:IC CHARGER BATT DUAL 16-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
| LTC3550EDHC#TRPBF | 功能描述:IC CHARGER BATT DUAL 16-DFN RoHS:是 类别:集成电路 (IC) >> PMIC - 电池管理 系列:- 标准包装:61 系列:- 功能:电源管理 电池化学:锂离子（Li-Ion）、锂聚合物（Li-Pol） 电源电压:4.35 V ~ 5.5 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:22-WFDFN 裸露焊盘 供应商设备封装:22-DFN（6x3）裸露焊盘 包装:管件 |
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