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参数资料
| 型号： | LTC3447EDD#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 10DFN |
| 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： | 0.69 V ~ 2.05 V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 频率 - 开关： | 1MHz |
| 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： | 10-WFDFN 裸露焊盘 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-DFN（3x3） |
LTC3447
APPLICATIO S I FOR ATIO
junction temperature of the part. The temperature rise
is given by:
T R = θ JA ? P D
where P D is the power dissipated by the regulator and
θ JA is the thermal resistance from the junction of the die
to the temperature.
The junction temperature, T J , is given by:
T J = T A + T R
possible? This capacitor provides the AC current to the
internal power MOSFETs.
5. Keep the switching node, SW, away from the sensitive
V OUT and FB nodes.
6. Keep the (–) plates of C IN and C OUT as close as pos-
sible.
where T A is the ambient temperature.
As an example, consider the LTC3447 when using an input
voltage of 3.6V, an ambient temperature of 70°C, and a
buck load current of 500mA. From the typical performance
graph of switch resistance, the R DS(ON) of the P-channel
switch at 70°C is approximately 0.45 Ω . Therefore, power
dissipated by the part is:
P D = I LOAD2 ? R DS(ON) = 112.5mW
For the DFN-10 package, the θ JA is 43°C/W. Thus, the
junction temperature of the regulator is:
T J = 70°C + (0.1125)(43) = 74.8°C
which is well below the maximum junction temperature of
R1
R2
V OUT
GND
FB
PGOOD
V IN
GND PLANE
SDA
V CCD
SCL
RUN
SW
C2
150°C. Note that at higher supply voltages, the junction
V IN
C IN
L1
temperature is lower due to reduced switch resistance
(R DS(ON) ).
PC Board Layout Checklist
When laying out the printed circuit board, the following
GND PLANE
C OUT
VIA
TO
V OUT
3447 F09
checklist should be used to ensure proper operation of
the LTC3447. These items are also illustrated graphically
in Figures 9 and 10. Check the following in your layout:
Figure 9. LTC3447 Suggested Layout
1. The power traces, consisting of the GND trace, the
R1
V OUT
SDA
SW trace, and the V IN trace should be kept short, direct
and wide.
2. Does the V OUT pin connect directly to the output voltage
R2
GND
FB
V CCD
SCL
C2
reference? Ensure that there is no load current running
from the output voltage and the V OUT sense pin.
3. Does the FB pin connect directly to the feedback voltage
PGOOD
V IN
RUN
SW
reference? Ensure that there is no load current running
from the feedback reference voltage and the FB pin.
V IN
C IN
C OUT
L1
V OUT
4. Does the (+) plate of C IN connect to V IN as closely as
3447 F11
Figure 10. LTC3447 Layout Diagram
3447f
14
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| LTC3448EDD | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8DFN RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 产品培训模块:MIC23xxx HyperLight Load™ Regulators 标准包装:5,000 系列:HyperLight Load® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:1.8V 输入电压:2.7 V ~ 5.5 V PWM 型:混合物 频率 - 开关:4MHz 电流 - 输出:2A 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:8-VFDFN 裸露焊盘，8-MLF? 包装:带卷 (TR) 供应商设备封装:8-MLF?（2x2） 产品目录页面:1094 (CN2011-ZH PDF) 其它名称:576-3303-2 |
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| LTC3448EDD#TRPBF | 功能描述:IC REG BUCK SYNC ADJ 0.6A 8DFN 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: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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