RT9178-25PB datasheet(10/11 Pages) RICHTEK

Part #	RT9178-25PB

Description	200mA, Ultra-Low Noise, Ultra-Fast CMOS LDO Regulator

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Manufacturer	RICHTEK [Richtek Technology Corporation]

Direct Link	http://www.richtek.com

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10 / 11 page

RT9178

10

DS9178-15 March 2007

www.richtek.com

It should be noted that stability problems have been seen

in applications where “vias” to an internal ground plane

were used at the ground points of the device and the input

and output capacitors. This was caused by varying ground

potentials at these nodes resulting from current flowing

through the ground plane. Using a single point ground

technique for the regulator and it’ s capacitors fixed the

problem. Since high current flows through the traces going

into VIN and coming from VOUT, Kelvin connect the capacitor

leads to these pins so there is no voltage drop in series

with the input and output capacitors.

Optimum performance can only be achieved when the

device is mounted on a PC board according to the diagram

below:

SOT-23-5 Board Layout

GND

V

OUT

EN

V

IN

BP

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