参数资料
型号: SC470ITSTRT
厂商: Semtech
文件页数: 18/31页
文件大小: 0K
描述: IC REG CTRLR BUCK PWM 14-TSSOP
标准包装: 1
PWM 型: 控制器
输出数: 1
电源电压: 5 V ~ 5.5 V
降压:
升压:
回扫:
反相:
倍增器:
除法器:
Cuk:
隔离:
工作温度: -40°C ~ 125°C
封装/外壳: 14-TSSOP(0.173",4.40mm 宽)
包装: 标准包装
产品目录页面: 1358 (CN2011-ZH PDF)
其它名称: SC470ITSDKR
NOT RECOMMENDED FOR NEW DESIGN
SC470
POWER MANAGEMENT
Application Information (Cont.)
The layout can be considered in two parts, the control section referenced to VSSA and the power section. Looking
at the control section first, locate all components referenced to VSSA on the schematic and place these components
at the chip. Connect VSSA using either a wide (>0.020”) trace or a copper pour if room allows. Very little current
flows in the chip ground therefore large areas of copper are not needed.
VBAT
5VSUS
5VSUS
R1
1M
0402
R2
10R
0402
VOUT
1
2
3
U1
EN/PSV
TON
VOUT
SC470
BST
DH
LX
14
13
12
VOUT SWITCH (1)
R5
49k9
C5
56p
0402
R3
20k0
0402
4
5
VCCA
FB
ILIM
VDDP
11
10
PGOOD
0402
6
PGD
DL
9
C8
1nF
0402
R7
20k0
0402
C10
1uF
0603
7
VSSA
PGND
8
C9
1uF
0603
Figure 9: Components Connected to VSSA
Figure 10: Example VSSA 0.020” Traces
In Figure 10 above, all components referenced to VSSA have been placed and have been connected using 0.020”
traces. Decoupling capacitors C9 and C10 are as close as possible to their pins. C9 should connect to the ground
plane using two vias
? 2005 Semtech Corp.
18
www.semtech.com
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