参数资料
| 型号： | SC173MLTRT |
| 厂商： | Semtech |
| 文件页数： | 20/27页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 3A 10MLPD |
| 产品培训模块： | Power Supplies 101 |
| 标准包装： | 1 |
| 系列： | EcoSpeed® |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.75 V ~ 5.23 V |
| 输入电压： | 3 V ~ 5.5 V |
| 频率 - 开关： | 200kHz ~ 1MHz |
| 电流 - 输出： | 3A |
| 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-VFDFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 10-MLPD（3x3） |
| 其它名称： | SC173MLDKR |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页第18页第19页当前第20页第21页第22页第23页第24页第25页第26页第27页
SC173
Layout Guideline
V IN +
R1
V IN -
V O +
C4
C3
C11
C2
C1
0
L1
C5
0
1 1
2 2
3 3
4 4
5 5
SC173
U1
BST VDD
VIN AGND
LX TON
PGND EN/PSV
PGOOD FB
10
9 9
8
7 7
6 6
C10
C 6
R2
EN/PSV
V O -
C7
R3
R6
R7
0
0
R4
C8
C9
0
Schematic for layout illustration
Since the SC173 has integrated switches, special consid-
eration should be given to board layout. Let us use the
schematic shown above as an example. The board level
layout is illustrated in the following four layers.
As shown on the top layer layout, U1 is the switching
regulator SC173. C1 and C11 serve as the decoupling ca-
pacitor for the buck converter power train. C11, with a
value between 1nF and 10nF, is the high frequency fil-
tering capacitor. It is recommended to put C1 and C11
as close as possible to the SC173 to get the best decou-
pling performance, with C11 closest. L1 is the output
filtering inductor. C2, C3 and C4 are the output filtering
capacitors. C5 is the boostrap capacitor. Pin 10 (VDD) is
the input bias power for the internal circuits. It is recom-
mended to get the power from VIN through an RC filter-
ing network consisted of R1, C6 and C10. The value of R1
can be between 3.01 W and 10 W and the capacitance of
C10 should be above 1 m F. C6, with a value of 1nF, is the
high frequency filtering capacitor. The locations of C6
and C10 should be as close as possible to pins 9 and 10,
? 2010 Semtech Corporation
with C6 closest, to get the best possible filtering result.
R2 is the on-time programming resistor. R2 should be
located as close as possible to pin 8 and it should return
to analog ground. The EN/PSV pin is a tri-state pin. Pull
EN/PSV high to enable the part with power save mode
enabled. Connect EN/PSV to AGND to disable the switch-
ing regulator. Leave EN/PSV floating to enable the IC in
forced continuous conduction mode.
Since there are two integrated MOSFETs inside the SC173
that will dissipate a lot of power, to help spread the heat
out of the IC more efficiently, there is a thermal pad un-
derneath the SC173 serving as a heat sink. To enlarge the
heat sinking area, a large copper plane under the thermal
pad as shown on the top layer is recommended.
On inner layer 2, a large analog ground plane (AGND) on
the right hand side is connected to the thermal pad un-
derneath the SC173 using vias. Thus the heat generated
inside the SC173 can be spread through the vias to the
inner layers to expand the heat sinking area.
20
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相关代理商/技术参数 |
参数描述 |
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| SC174 | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:4A EcoSpeedTM Synchronous Step-Down Regulator with Optional Ultrasonic Power Save |
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| SC174EVB | 制造商:SEMTECH 制造商全称:Semtech Corporation 功能描述:4A EcoSpeedTM Synchronous Step-Down Regulator with Optional Ultrasonic Power Save |
| SC174ML.TRT | 制造商:Semtech Corporation 功能描述: |
| SC174MLTRT | 功能描述:IC REG BUCK SYNC ADJ 4A 10MLPD RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:EcoSpeed® 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 |
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