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If the RS7300 uses a SOT‐89 package and this package is mounted on a double sided printed circuit board with two square
英寸的铜分配给“热扩散” ，由此产生的θ
JA
is 155°C/W.
Based on the maximum operating junction temperature 125°C with an ambient of 25°C, the maximum power dissipation will
是：
P
最大
=
(
T
J
−
T
A
) (
125
−
25
)
=
=
0
.
65 W
θ
JC
+
θ
CA
155
Thermal characteristics were measured using a double sided board with 1”x2” square inches of copper area connected to the
GND引脚“热扩散” 。
输入输出电压差
监管机构的最小输入输出电压差，或压差电压，确定最低可用电源电压。在
电池供电的系统，这将决定报废的有用电池电压。的RS7300使用P沟道MOSFET
导通晶体管，其电压差是漏极 - 源极导通电阻R的函数
DS （ ON）
乘以负载电流。
V
降
=
V
IN
−
V
OUT
=
R
DS
(
ON
)
×
I
OUT
DS‐RS7300‐14
September, 2009
www.Orister.com
ORISTER [ ORISTER CORPORATION ]
