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参数资料
| 型号： | LTC3405ES6#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 13/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ .3A SOT23-6 |
| 标准包装： | 1 |
| 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： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1.5MHz |
| 电流 - 输出： | 300mA |
| 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-23-6 细型，TSOT-23-6 |
| 包装： | 标准包装 |
| 供应商设备封装： | TSOT-23-6 |
| 产品目录页面： | 1334 (CN2011-ZH PDF) |
| 其它名称： | LTC3405ES6#TRMPBFDKR |
LTC3405
APPLICATIO S I FOR ATIO
Substituting V OUT = 2.5V, V IN = 4.2V, ? I L = 100mA and
f = 1.5MHz in equation (3) gives:
For the feedback resistors, choose R1 = 412k. R2 can
then be calculated from equation (2) to be:
? 1 ?
? ? 6 . 8 μ H
R 2 = ? OUT ? 1 ? R 1 = 875 . 5 k ; use 8 87k
L =
2 . 5 V ?
1 . 5 MHz ( 100 mA ) ?
2 . 5 V ?
4 . 2 V ?
? V ?
? 0 . 8 ?
For best efficiency choose a 300mA or greater inductor
with less than 0.3 ? series resistance.
Figure 11 shows the complete circuit along with its
efficiency curve.
C IN will require an RMS current rating of at least 0.125A ?
I LOAD(MAX) /2 at temperature and C OUT will require an ESR
of less than 0.6 ? and greater than 0.1 ? . In most cases,
a tantalum capacitor will satisfy this requirement.
100
90
80
70
V IN = 4.2V
V IN = 2.7V
V IN = 3.6V
C IN
V IN
2.7V
TO 4.2V
?
2.2 μ F
CER
4
1
6
V IN SW
LTC3405
RUN
MODE V FB
3
5
6.8 μ H*
22pF
+
V OUT
2.5V
C OUT **
33 μ F
TANT
60
50
40
TAIYO YUDEN LMK212BJ225MG
GND
2
887k
412k
3405 F11a
*SUMIDA CMD4D11-6R8MC
** AVX TPSB336K006R0600
?
30
0.1
1 10 100
OUTPUT CURRENT (mA)
1000
3405 F11b
Figure 11a
TYPICAL APPLICATIO S
Single Li-Ion to 1.8V/300mA Regulator
Optimized for Small Footprint and High Efficiency
Figure 11b
V IN
2.7V
TO 4.2V
C IN **
1 μ F
CER
4
1
6
V IN SW
LTC3405
RUN
MODE V FB
3
5
1M
4.7 μ H*
22pF
V OUT
1.8V
C OUT ?
4.7 μ F
CER
* MURATA LQH3C4R7M34
TAIYO YUDEN CERAMIC JMK212BJ475MG
100
GND
2
332k
200k
** TAIYO YUDEN CERAMIC JMK107BJ105MA
?
3405 TA01a
90
80
70
60
50
40
30
V IN = 4.2V
V IN = 2.7V
V IN = 3.6V
V OUT
100mV/DIV
AC COUPLED
I L
200mA/DIV
I LOAD
200mA/DIV
0.1
1
10
100
1000
V IN = 3.6V
40 μ s/DIV
OUTPUT CURRENT (mA)
3405 TA01b
I LOAD = 100mA TO 250mA
3405 TA01c
3405fa
13
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