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SC1182CSW 参数 Datasheet PDF下载

SC1182CSW图片预览
型号: SC1182CSW
PDF下载: 下载PDF文件 查看货源
内容描述: 可编程同步DC / DC转换器,双低压差线性稳压控制器 [PROGRAMMABLE SYNCHRONOUS DC/DC CONVERTER, DUAL LOW DROPOUT REGULATOR CONTROLLER]
分类和应用: 转换器控制器
文件页数/大小: 12 页 / 132 K
品牌: SEMTECH [ SEMTECH CORPORATION ]
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PROGRAMMABLE SYNCHRONOUS DC/DC  
CONVERTER, DUAL LOW DROPOUT  
REGULATOR CONTROLLER  
SC1182/3  
August 25, 1998  
4) The Output Capacitor(s) (Cout) should be located  
as close to the load as possible, fast transient load  
currents are supplied by Cout only, and connections  
between Cout and the load must be short, wide cop-  
per areas to minimize inductance and resistance.  
5V supply through a 10 resistor, the Vcc pin should  
be decoupled directly to AGND by a 0.1 F ceramic  
µ
capacitor, trace lengths should be as short as possi-  
ble.  
7) The Current Sense resistor and the divider across  
it should form as small a loop as possible, the traces  
running back to CS+ and CS- on the SC1182/3  
should run parallel and close to each other. The  
5) The SC1182/3 is best placed over a quiet ground  
plane area, avoid pulse currents in the Cin, Q1, Q2  
loop flowing in this area. PGNDH and PGNDL should  
be returned to the ground plane close to the package.  
The AGND pin should be connected to the ground  
side of (one of) the output capacitor(s). If this is not  
possible, the AGND pin may be connected to the  
ground path between the Output Capacitor(s) and the  
Cin, Q1, Q2 loop. Under no circumstances should  
AGND be returned to a ground inside the Cin, Q1, Q2  
loop.  
0.1 F capacitor should be mounted as close to the  
µ
CS+ and CS- pins as possible.  
8) Ideally, the grounds for the two LDO sections  
should be returned to the ground side of (one of) the  
output capacitor(s).  
6) Vcc for the SC1182/3 should be supplied from the  
5V  
+
Vout  
+
Currents in various parts of the power section  
9
© 1998 SEMTECH CORP.  
652 MITCHELL ROAD NEWBURY PARK CA 91320