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参数资料
| 型号： | LTC3406BES5-1.2#TRMPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.2V TSOT23-5 |
| 标准包装： | 500 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1.2V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 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 |
| 其它名称： | LTC3406BES5-1.2#PBF LTC3406BES5-1.2#PBF-ND |
LTC3406B-1.2
APPLICATIO S I FOR ATIO
The regulator loop then acts to return V OUT to its steady-
state value. During this recovery time V OUT can be moni-
tored for overshoot or ringing that would indicate a stability
problem. For a detailed explanation of switching control
loop theory, see Application Note 76.
A second, more severe transient is caused by switching in
loads with large (>1 μ F) supply bypass capacitors. The
discharged bypass capacitors are effectively put in parallel
with C OUT , causing a rapid drop in V OUT . No regulator can
deliver enough current to prevent this problem if the load
switch resistance is low and it is driven quickly. The only
3. Keep the (–) plates of C IN and C OUT as close as possible.
Design Example
As a design example, assume the LTC3406B-1.2 is used
in a 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
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. With this informa-
tion we can calculate L using equation (1),
1 . 2 V ? 1 ?
V IN ?
solutionistolimittherisetimeoftheswitchdrivesothat
the load rise time is limited to approximately (25 ? C LOAD ).
Thus, a 10 μ F capacitor charging to 3.3V would require a
L =
1
( f ) ( ? I L )
?
?
1 . 2 V ?
?
(3)
250 μ s rise time, limiting the charging current to about
130mA.
Substituting V IN = 4.2V, ? I L = 240mA and f = 1.5MHz in
equation (3) gives:
? 1 ?
? = 2 . 38 μ H
PC Board Layout Checklist
When laying out the printed circuit board, the following
checklist should be used to ensure proper operation of the
L =
1 . 2 V ?
1 . 5 MHz ( 240 mA ) ?
1 . 2 V ?
4 . 2 V ?
LTC3406B-1.2. These items are also illustrated graphi-
cally in Figures 3 and 4. Check the following in your layout:
1. The power traces, consisting of the GND trace, the SW
trace and the V IN trace should be kept short, direct and
wide.
2. Does the (+) plate of C IN connect to V IN as closely as
possible? This capacitor provides the AC current to the
internal power MOSFETs.
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 ?
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.
1
RUN
VIA TO V OUT
VIA TO V IN
V IN
LTC3406B-1.2
–
2
GND V OUT
5
PIN 1
V OUT
+
C OUT
L1
3
SW
V IN
C IN
4
V OUT
L1
SW
LTC3406B-1.2
V IN
3406B12 F03
BOLD LINES INDICATE HIGH CURRENT PATHS
C OUT
GND
C IN
3406B12 F04
Figure 3. LTC3406B-1.2 Layout Diagram
Figure 4. LTC3406B-1.2 Suggested Layout
sn3406b12 3406b12fs
10
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3406BES5TRMPBF | 制造商:Linear Technology 功能描述:DC-DC Converter Step-Down 5.5V TSOT23-5 |
| LTC3406ES5 | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 2.5V to 5.5V 5-Pin TSOT-23 |
| LTC3406ES5#PBF | 制造商:Linear Technology 功能描述:Conv DC-DC Single Step Down 2.5V to 5.5V 5-Pin TSOT-23 制造商:Linear Technology 功能描述:IC DC-DC CONV 1.5 MHz 5-SOT-23 制造商:Linear Technology 功能描述:BUCK 5.5VIN 1.5MHZ 0.6A 5TSOT23 制造商:Linear Technology 功能描述:BUCK, 5.5VIN, 1.5MHZ, 0.6A, 5TSOT23 制造商:Linear Technology 功能描述:IC, DC-DC CONV, 1.5 MHz, 5-SOT-23; Primary Input Voltage:5.5V; No. of Outputs:1; Output Voltage:600mV; Output Current:600mA; No. of Pins:5; Operating Temperature Min:-40C; Operating Temperature Max:85C; Package / Case:5-SOT-23 ;RoHS Compliant: Yes |
| LTC3406ES5#TR | 功能描述:IC REG BUCK SYNC ADJ TSOT23-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
| LTC3406ES5#TRM | 功能描述:IC REG BUCK SYNC ADJ TSOT23-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:2,500 系列:- 类型:升压（升压） 输出类型:可调式 输出数:1 输出电压:1.24 V ~ 30 V 输入电压:1.5 V ~ 12 V PWM 型:电流模式，混合 频率 - 开关:600kHz 电流 - 输出:500mA 同步整流器:无 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 包装:带卷 (TR) 供应商设备封装:8-SOIC |
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