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参数资料
| 型号： | LTC3543EDCB#PBF |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 1.3 A SWITCHING REGULATOR, 2250 kHz SWITCHING FREQ-MAX, PDSO6 |
| 封装： | 2 X 3 MM, 0.75 MM HEIGHT, LEAD FREE, PLASTIC, MO-229, DFN-6 |
| 文件页数： | 8/20页 |
| 文件大小： | 329K |
| 代理商： | LTC3543EDCB#PBF |
LTC3543
16
3543fa
VOUT
4
5
6
3
2
1
R1
R2
SW
VIN
VFB
MODE
RUN
CFWD
CIN
L
GND
VIN
CAP
COUT
3543 F06
C1
VIA TO GND
VIA TO VOUT
VIA TO R2
VIA TO R1
Figure 6. LTC3543 Suggested Layout
Design Example
As a design example, assume the LTC3543 is used in
a single lithium-ion battery-powered cellular phone ap-
plication. The VIN will be operating from a maximum of
4.2V down to about 2.7V. The load current requirement
is a maximum of 600mA, but most of the time it will be
in standby mode, requiring only 2mA. Efciency at both
low and high load currents is important. Output voltage
is 1.5V. With this information we can calculate L using
Equation 1,
L
V
fI
V
OUT
L
OUT
IN
=
Δ
1
A 3.3μH inductor works well for this application, yielding
a ripple current of only 130mA. For best efciency choose
a 665mA or greater inductor with less than 0.05
Ω series
resistance.
In Equation 2, CIN will require an RMS current rating of
at least 0.3A at ILOAD(MAX)/2 at temperature.
Using Equation 3, Selecting a 4.7μF capacitor with an
ESR of 0.05
Ω for COUT yields an 8mV voltage ripple on
the regulated output voltage.
For feedback resistors, choose R1 = 402k. R2 can then
be calculated using Equation 4.
R
V
Rk
OUT
2
06
1
1 604
=
=
.
Figure 6 shows the complete circuit along with its ef-
ciency curve.
APPLICATIONS INFORMATION
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3543EDCB#TRM | 1.3 A SWITCHING REGULATOR, 2250 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3543EDCB | 1.3 A SWITCHING REGULATOR, 2250 kHz SWITCHING FREQ-MAX, PDSO6 |
| LTC3544BEUD#TR | 0.8 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PQCC16 |
| LTC3544EUD | 0.8 A SWITCHING REGULATOR, 2700 kHz SWITCHING FREQ-MAX, PQCC16 |
| LTC3547BEDDB | 0.7 A DUAL SWITCHING CONTROLLER, 2700 kHz SWITCHING FREQ-MAX, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC3544 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Quad Synchronous Step-Down Regulator: 2.25MHz, 300mA, 200mA, 200mA, 100mA |
| LTC3544B | 制造商:LINER 制造商全称:Linear Technology 功能描述:Quad Synchronous Step-Down Regulator: 2.25MHz, 300mA, 200mA, 200mA, 100mA |
| LTC3544BEUD | 制造商:LINER 制造商全称:Linear Technology 功能描述:Quad Synchronous Step-Down Regulator: 2.25MHz, 300mA, 200mA, 200mA, 100mA |
| LTC3544BEUD#PBF | 功能描述:IC REG BUCK SYNC ADJ QUAD 16QFN RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:250 系列:- 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:2.05 V ~ 6 V PWM 型:电压模式 频率 - 开关:2MHz 电流 - 输出:500mA 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:6-UFDFN 包装:带卷 (TR) 供应商设备封装:6-SON（1.45x1） 产品目录页面:1032 (CN2011-ZH PDF) 其它名称:296-25628-2 |
| LTC3544BEUD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ QUAD 16QFN RoHS:是 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:降压（降压） 输出类型:固定 输出数:1 输出电压:1.2V，1.5V，1.8V，2.5V 输入电压:2.7 V ~ 20 V PWM 型:- 频率 - 开关:- 电流 - 输出:50mA 同步整流器:是 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 包装:带卷 (TR) 供应商设备封装:10-MSOP 裸露焊盘 |
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