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参数资料
| 型号： | LTC3406ES5-1.8#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 12/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.8V TSOT23-5 |
| 标准包装： | 2,500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.8V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.5MHz |
| 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： | SOT-23-5 细型，TSOT-23-5 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | TSOT-23-5 |
LTC3406
LTC3406-1.5/LTC3406-1.8
APPLICATIO S I FOR ATIO
1
RUN
V FB
5
V OUT
–
+
C OUT
L1
2
3
LTC3406
GND
SW V IN
C IN
4
R2
C FWD
R1
V IN
V OUT
–
+
C OUT
L1
1
2
3
RUN
LTC3406-1.8
GND V OUT
SW V IN
C IN
5
4
V IN
3406 F05b
BOLD LINES INDICATE HIGH CURRENT PATHS
Figure 5a. LTC3406 Layout Diagram
3406 F05a
BOLD LINES INDICATE HIGH CURRENT PATHS
Figure 5b. LTC3406-1.8 Layout Diagram
VIA TO GND
R1
VIA TO V IN
V IN
VIA TO V OUT
VIA TO V IN
V IN
PIN 1
R2
VIA TO V OUT
PIN 1
V OUT
L1
SW
C OUT
LTC3406
C IN
C FWD
V OUT
L1
SW
C OUT
LTC3406-1.8
C IN
GND
3406 F06a
Figure 6a. LTC3406 Suggested Layout
Design Example
As a design example, assume the LTC3406 is used in a
GND
3406 F06b
Figure 6b. LTC3406-1.8 Suggested Layout
Substituting V OUT = 2.5V, V IN = 4.2V, ? I L = 240mA and
f = 1.5MHz in equation (3) gives:
? 1 ?
? = 2 . 81 μ H
single lithium-ion battery-powered cellular phone
application. The V IN will be operating from a maximum of
4.2V down to about 2.7V. The load current requirement
L =
2 . 5 V ?
1 . 5 MHz ( 240 mA ) ?
2 . 5 V ?
4 . 2 V ?
is a maximum of 0.6A but most of the time it will be in
standby mode, requiring only 2mA. Efficiency at both low
and high load currents is important. Output voltage is
2.5V. With this information we can calculate L using
equation (1),
A 2.2 μ H inductor works well for this application. For best
efficiency choose a 720mA or greater inductor with less
than 0.2 ? series resistance.
C IN will require an RMS current rating of at least 0.3A ?
V OUT ? 1 ? OUT ?
L =
1
( ) f ( ? I L )
? V ?
? V IN ?
(3)
I LOAD(MAX) /2 at temperature and C OUT will require an ESR
of less than 0.25 ? . In most cases, a ceramic capacitor will
satisfy this requirement.
3406fa
12
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相关代理商/技术参数 |
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| LTC3406ES5TRMPBF | 制造商:Linear Technology 功能描述:LTC3406 adj 600mA SD dc-dc converter |
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