AAT4618 datasheet(9/11 Pages) AAT

Part #	AAT4618

Description	Current Limited Load Switch

PDF	11 Pages

Scroll/Zoom	100%

Manufacturer	AAT [Advanced Analog Technology, Inc.]

Direct Link	http://www.aatech.com.tw

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9 / 11 page

AAT4618 would be if the AAT4618 were not dissi-

pating power. Equation 1 can be rearranged to

solve for IMAX, as shown in Equation 2.

Eq. 2:

TSD(MIN) is the minimum temperature required to

activate the AAT4618 over-temperature protection.

With the typical specification of 125°C, 115°C is a

safe minimum value to use.

For example, if an application is specified to oper-

ate in 50°C environments, the PCB operates at

temperatures as high as 85°C. The application is

sealed and its PCB is small, causing RθJA to be

approximately 150 °C/W. Using Equation 2,

Eq. 3:

The AAT4618 is safe to operate at the minimum

current limit level of 500mA at 85°C.

IMAX

= 950mA

115 - 85

220 · 150

IMAX

TSD(MIN) - TA(MAX)

RDS(ON)(MAX) · RΘJA

AAT4618

Current Limited Load Switch

4618.2006.05.1.2

AAT4618 Datasheet(PDF) 9 Page - Advanced Analog Technology, Inc.