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参数资料
| 型号： | LTC3404MPMS8#PBF |
| 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 8MSOP |
| 标准包装： | 50 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 6 V |
| 输入电压： | 2.65 V ~ 6 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.4MHz |
| 电流 - 输出： | 600mA |
| 同步整流器： | 是 |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-MSOP |
LTC3404
APPLICATIO S I FOR ATIO
? 1 ?
? = 6 μ H
R 2 = ? OUT ? 1 ? R 1 = 875 . 5 k ; use 8 87k
Substituting V OUT = 2.5V, V IN = 4.2V, ΔI L =120mA and
f = 1.4MHz in equation (3) gives:
2 . 5 V ? 2 . 5 V ?
L =
1 . 4 MHz ( 120 mA ) ? 4 . 2 V ?
A 6.2 μ H inductor works well for this application. For best
efficiency choose a 1A inductor with less than 0.25 Ω
series resistance.
C IN will require an RMS current rating of at least 0.15A at
0.25 Ω . In most applications, the requirements for these
capacitors are fairly similar.
For the feedback resistors, choose R1 = 412k. R2 can
then be calculated from equation (2) to be:
? V ?
? 0 . 8 ?
Figure 8 shows the complete circuit along with its effi-
ciency curve.
temperature and C OUT will require an ESR of less than
95
V IN
2.65V
V IN = 3V
10 μ F***
47pF
1
2
3
4
RUN
I TH
V FB
GND
LTC3404
PLL LPF
SYNC/MODE
V IN
SW
8
CER
7
6
5 6.2 μ H*
22 μ F**
CER
TO 4.2V
V OUT
2.5V
90
85
80
75
V IN = 4.2V
V IN = 3.6V
412k
887k
20pF
3404 F08a
* TOKO D63LCB A920CY-6R2M
** TAIYO-YUDEN CERAMIC JMK325BJ226MM
70
0.1
1.0
V OUT = 2.5V
L = 6.2 μ H
10 100 1000
*** TAIYO-YUDEN CERAMIC LMK325BJ106MN
OUTPUT CURRENT (mA)
3404 F8b
Figure 8. Single Lithium-Ion to 2.5V/0.3A Regulator from Design Example
TYPICAL APPLICATIO S
Single Li-Ion to 2.5V/0.6A Regulator
Using All Ceramic Capacitors
LTC3404
1
2
RUN
I TH
PLL LPF
SYNC/MODE
8
7
47pF
3
4
V FB
GND
V IN
SW
6
5
4.7 μ H*
V OUT
2.5V
V IN
C IN *** 3V TO 4.2V
10 μ F
20pF
887k
C OUT ** 0.6A
22 μ F
CER
CER
* TOKO D52LC A914BYW-4R7M
** TAIYO-YUDEN CERAMIC JMK325BJ226MM
*** TAIYO-YUDEN CERAMIC LMK325BJ106MN
412k
3404 TA03
3404fb
14
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相关代理商/技术参数 |
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|---|---|
| LTC3405 | 制造商:LINEAR 制造商全称:LINEAR 功能描述:Standalone 250mA Li-Ion Battery Charger in 2 × 2 DFN |
| LTC3405A | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5MHz, 300mA Synchronous Step-Down Regulator in ThinSOT |
| LTC3405A-1.375 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.375V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT |
| LTC3405A-1.5 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5V, 1.8V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT |
| LTC3405A-1.8 | 制造商:LINER 制造商全称:Linear Technology 功能描述:1.5V, 1.8V, 1.5MHz, 300mA Synchronous Step-Down Regulators in ThinSOT |
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