RS7215-18NHNSKP datasheet(6/10 Pages) ORISTER

Part #	RS7215-18NHNSKP

Description	1A Adjustable & Fixed Voltage LDO Linear Regulator with Enable Function & Fast Discharge

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Manufacturer	ORISTER [Orister Corporation]

Direct Link	http://www.orister.com

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DS‐RS7215‐02 September, 2009

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Operating Region and Power Dissipation

Maximum power dissipation of the RS7215 depends on the thermal resistance of the case and circuit board, the temperature

difference between the die junction and ambient air, and the rate of airflow. The power dissipation across the devices is P =

IOUT x (VIN‐VOUT). The resulting maximum power dissipation is:

JA

A

J

CA

JC

A

J

MAX

T

P

θ

)

(

)

(

−

=

+

−

=

Where (TJ‐TA) is the temperature difference between the RS7215 die junction and the surrounding air, θJC is the thermal

resistance of the package chosen, and θCA is the thermal resistance through the printed circuit board, copper traces and

other materials to the surrounding air. For better heat‐sinking, the copper area should be equally shared between the VIN,

VOUT, and GND pins.

Dropout 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 RS7215 use 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.

OUT

ON

DS

OUT

IN

DROPOUT

I

R

V

×

=

−

=

)

(

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