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参数资料
| 型号： | LTC3409IDD#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 14/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 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： | 0.62 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： | 1.7MHz ~ 2.6MHz |
| 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-EP（3x3） |
LTC3409
APPLICATIONS INFORMATION
Design Example
As a design example, assume the LTC3409 is used in a
2-alkaline cell battery-powered application. The V IN will be
operating from a maximum of 3.2V down to about 1.8V.
The load current requirement is a maximum of 600mA
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 2:
For best ef?ciency choose a 750mA or greater inductor
with less than 0.3Ω series resistance. C IN will require
an RMS current rating of at least 0.3A ? I LOAD(MAX) /2 at
temperature.
For the feedback resistors, choose R2 = 133k. R1 can then
be calculated from Equation 2 at 191K. Figure 4 shows the
complete circuit along with its ef?ciency curve.
Table 2 below gives 1% resistor values for selected output
voltages.
L =
1
f ? I L
V OUT 1–
V OUT
V IN
(2)
V OUT
0.85V
1.2V
R1
51.1k
127k
R2
133k
133k
Substituting V OUT = 1.5V, V IN = 3.2V, ΔI L = 240mA and
f = 1.7MHz in Equation 2 gives:
1.5V
1.8V
191k
255k
133k
133k
1.5 ?? 1–
1.5 ? ?
3.2 ? ?
L=
1
1.7MHz ? 240mA
?
? ?
? 2.2 μ H
Burst Mode Ef?ciency, 1.5V OUT
100
V IN
1.6V TO 5.5V
C IN
4.7μF
R2
133k
LTC3409
V FB SYNC
GND RUN
L1
2.2μH
V OUT
90
80
70
60
1.8V IN
3.1V IN
2.5V IN
V IN
V IN
R1
191k
SW
MODE
C OUT
10μF
CER
1.5V
0.6A
50
40
30
L1: SUMIDA CDRH2D18/LD
3409 F04
20
10
C1
10pF
0
0.1
1
10 100
1000
LOAD CURRENT (mA)
3409 F04b
Figure 4
3409fc
14
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相关代理商/技术参数 |
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|---|---|
| LTC3410 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.25MHz, 300mA Synchronous Step-Down Regulator in SC70 |
| LTC3410-1.875 | 制造商:LINER 制造商全称:Linear Technology 功能描述:2.25MHz, 300mA Synchronous Step-Down Regulator in SC70 |
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