LP28303ASPF datasheet(6/8 Pages) POWER

6 / 8 page

LP28303A-00

Apr.-2017

Email: marketing@lowpowersemi.com

www.lowpowersemi.com

Page 6 of 8

Preliminary Datasheet

LP28303A

The resistor values of R1 and R2 are calculated by

the following equations:

For NTC Thermistors:

(

)

(

)

(

)

(

)

(

)

For PTC Thermistors:

(

)

(

)

(

)

(

)

(

)

K1(VNTC1)=45%, K2(VNTC2)=80%.

Where RTL is the low temperature resistance and RTH

is the high temperature resistance of thermistor, as

specified by the thermistor manufacturer. R1 or R2

can be omitted if only one temperature (low or high)

setting is required. Applying a voltage between the

VNTC1 and VNTC2 thresholds to pin NTC disables the

temperature-sensing feature.

Layout Considerations

Switch rise and fall times are kept under 5ns for

maximum efficiency. To minimize radiation, the SW

pin and input bypass capacitor leads (between VIN

and GND) should be kept as short as possible. A

ground plane should be used under the switching

circuitry to prevent inter plane coupling. The Exposed

Pad must be connected to the ground plane for

proper power dissipation. The other paths contain

only DC and/or 600KHz tri-wave ripple current and

are less critical. With the exception of the input and

output filter capacitors (which should be connected to

GND) all other components that return to ground

should be connected to GND.

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