Datasheet > AAT4672

AAT4672

更新时间： 2022-04-23 23:00:11

品牌	Logo	应用领域
ANALOGICTECH		开关
页数	文件大小	规格书
24页	1259K
描述
Power Supply Selector Switch

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AAT4672 数据手册

PRODUCT DATASHEET

AAT4672

SmartSwitch

Power Supply Selector Switch

PCB Layout Recommendations

T_SD(MIN)- T_A(MAX)

_DS(ON)(MAX)· R_ΘJA

Eq. 2:

I_MAX

For proper thermal management, to minimize PCB trace

resistance, and to take advantage of the low R_DS(ON)val-

ues of the two internal power switches in the AAT4672,

certain circuit board layout rules should be followed:

MAIN, AUX, and OUT should be routed using wider than

normal traces. The two MAIN pins (1 and 2) and two

AUX pins (3 and 4) should be connected to the same

wide PCB trace; and GND should be connected to a

ground plane. For best performance, input capacitors

(C_MAIN, C_AUX) and output capacitor (C_OUT) should be placed

as close to the package pins as possible. The AAT4672

evaluation board layout follows the printed circuit board

layout recommendations and can be used as an example

of an optimal board layout.

T_SD(MIN)is the minimum temperature required to activate

the AAT4672 over-temperature protection (thermal

shutdown). With typical specification of 140°C, 125°C is

a safe minimum value to use.

For example, for a 2.5V input power supply application

that is specified to operate in 50°C environments where

the PCB operates at temperatures as high as 85°C. The

application is sealed and its PCB is small, causing R_θJAto

be approximately 160°C/W. The R_DS(ON)(MAX)is estimated

to be 300mΩ (from the “R_DS(ON)vs. Temperature” perfor-

mance graph, where V_IN= 2.5V at 85°C plus 50%). To

find the maximum current (I_MAX) for this application, use

Equation 2:

125°C - 85°C

300mΩ · 160°C/W

I_MAX

= 0.913A

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4672.2008.04.1.0

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