参数资料
型号: SC1566I5M1.8TRT
厂商: Semtech
文件页数: 8/12页
文件大小: 0K
描述: IC REG LDO 1.8V 3A TO-263-5
标准包装: 1
稳压器拓扑结构: 正,固定式
输出电压: 1.8V
输入电压: 2.2 V ~ 5.5 V
电压 - 压降(标准): 0.35V @ 3A
稳压器数量: 1
电流 - 输出: 3A
电流 - 限制(最小): 3A
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: TO-263-6,D²Pak(5 引线+接片),TO-263BA
供应商设备封装: TO-263-5
包装: 标准包装
产品目录页面: 1358 (CN2011-ZH PDF)
其它名称: SC1566I5M1.8DKR
SC1566
POWER MANAGEMENT
Applications Information (Cont.)
( 150 ? 85 ) = 36 ° C / W
( T J ( MAX ) ? T A ( MAX ) )
R TH ( J ? A )( MAX ) = =
Using this figure, and assuming T A(MAX) = 85°C, we can
calculate the maximum thermal impedance allowable to
maintain T J ≤ 150°C (see page 7):
P D ( MAX ) 1 . 81
R TH ( J ? C )( MAX ) = 3 ° C / W and R TH ( C ? S ) = 0 ° C / W ,
therefore R TH ( S ? A )( MAX ) = 33 ° C / W
This should be achievable for the TO-263 package using
pcb copper area to aid in conducting the heat away from
the device, such as a large (~2 squ. inch) pad connected
to the tab of the device. Internal ground/power planes
and air flow will also assist in removing heat. For higher
power dissipations it may be necessary to use a small
heatsink and the TO-220 package.
Co=2.2uF, Stable Region:
Unstable Region:
3mA
30mA
300mA
Load
Co=22uF, Stable Region:
Unstable Region:
3mA
30mA
300mA
Load
0.001
0.01
0.1
ESR(Ohms)
1
3A
10
0.001
0.01
0.1
ESR(Ohms)
1
3A
10
Co=220uF, Stable Region:
Unstable Region:
3mA
30mA
300mA
3A
Load
0.001
0.01
0.1
1
10
ESR(Ohms)
Figure 1. Phase-margin Contour Plot
? 2005 Semtech Corp.
8
www.semtech.com
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