FS8853 datasheet(10/13 Pages) ETC

10 / 13 page

FS8853

300mA LDO Linear Regulator

Fortune Semiconductor Co.

TEL : +886-2-2809-4742

10/13

TD-0405006

Rev. 1.5

http://www.fsc.com.tw

FAX: +886-2-2809-4874

package is mounted on a double sided printed

circuit board with two square inches of copper

allocated for “heat spreading”, the resulting θJA is

180 °C/W.

Based

maximum

operating

junction

temperature 125 °C with an ambient of 25°C, the

maximum power dissipation will be:

() ()

MAX

555

180

125

−

Thermal characteristics were measured using a

double sided board with 1” x 2” square inches of

copper area connected to the GND pin for “heat

spreading”.

Input-Output Voltage

A regulator’s

minimum

input-output

voltage

differential, or dropout voltage, determines the

lowest usable supply voltage. In battery-powered

systems, this will determine the useful end-of-life

battery voltage. The FS8853 uses a P-channel

MOSFET pass transistor, its dropout voltage is a

function of drain-to-source on-resistance (RDS(ON))

multiplied by the load current.

VDROPOUT = VIN-VOUT = RDS(ON) x IOUT

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