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MIC24420 Datasheet(PDF) 24 Page - Micrel Semiconductor

Part No. MIC24420
Description  2.5A Dual Output PWM Synchronous Buck Regulator IC
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Manufacturer  MICREL [Micrel Semiconductor]
Direct Link  http://www.micrel.com
Logo MICREL - Micrel Semiconductor

MIC24420 Datasheet(HTML) 24 Page - Micrel Semiconductor

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Micrel, Inc.
MIC24420/MIC24421
June 2012
24
M9999-062012-C
(SW) must be keep as short as possible.
RC Snubber
Place the RC snubber on the same side of the board
and as close as possible to the low-side MOSFET.
Low-side MOSFET
Low-side drive MOSFET traces (LSD pin to
MOSFET gate pin) must be short and routed over a
ground plane. The ground plane should be the
connection between the MOSFET source and
PGND.
Chose a low-side MOSFET with a high CGS/CGD
ratio and a low internal gate resistance to minimize
the effect of dv/dt inducted turn-on.
Do not put a resistor between the LSD output and
the gate.
Use a 4.5V Vgs rated MOSFET. Its higher gate
threshold voltage is more immune to glitches than a
2.5V or 3.3V rated MOSFET. MOSFETs that are
rated for operation at less than 4.5VGS should not be
used.
High-side MOSFET
Add a 20 to 60 ohm resistor in series with the boost
pin. This will slow down the turn-on time of the high-
side MOSFET while leaving the turn-off time
unaffected.


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