LM2731XMF datasheet(15/16 Pages) NSC

Part #	LM2731XMF

Description	0.6/1.6 MHz Boost Converters With 22V Internal FET Switch in SOT-23

PDF	16 Pages

Scroll/Zoom	100%

Manufacturer	NSC [National Semiconductor (TI)]

Direct Link	http://www.national.com

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15 / 16 page

Application Hints (Continued)

(SW) =DCxIIND(AVE)

2 xR

DS(ON)

There will be some switching losses as well, so some derat-

ing needs to be applied when calculating IC power dissipa-

tion.

INDUCTOR SUPPLIERS

Recommended suppliers of inductors for this product in-

clude, but are not limited to Sumida, Coilcraft, Panasonic,

TDK and Murata. When selecting an inductor, make certain

that the continuous current rating is high enough to avoid

saturation at peak currents. A suitable core type must be

used to minimize core (switching) losses, and wire power

losses must be considered when selecting the current rating.

SHUTDOWN PIN OPERATION

The device is turned off by pulling the shutdown pin low. If

this function is not going to be used, the pin should be tied

directly to V

IN. If the SHDN function will be needed, a pull-up

resistor must be used to V

IN (approximately 50k-100k

Ω rec-

ommended). The SHDN pin must not be left unterminated.

LM2731XMF Datasheet(PDF) 15 Page - National Semiconductor (TI)