FS8855 datasheet(11/14 Pages) FORTUNE

tên linh kiện	FS8855

Giải thích chi tiết về linh kiện	500 mA LDO Linear Regulator

PDF	14 Pages

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nhà sản xuất	FORTUNE [Fortune Semiconductor Corp.]

Trang chủ	https://www.ic-fortune.com/eng/index.asp

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11 / 14 page

FS8855

Rev. 2.7

11/14

If the FS8855 uses a SOT-89 package and this

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 temperature 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

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 FS8855 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

FS8855 bảng dữ liệu(PDF) 11 Page - Fortune Semiconductor Corp.