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LP28303ASPF датащи(PDF) 6 Page - Lowpower Semiconductor inc

номер детали LP28303ASPF
подробное описание детали  2.5A Synchronous Buck Li-ion Charger
PDF  8 Pages
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производитель  POWER [Lowpower Semiconductor inc]
домашняя страница  http://www.lowpowersemi.com
Logo POWER - Lowpower Semiconductor inc

LP28303ASPF датащи(HTML) 6 Page - Lowpower Semiconductor inc

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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:
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For PTC Thermistors:
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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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