rt9232a Richtek Technology Corporation, rt9232a Datasheet - Page 13

• Manufacturer Part Number: rt9232a
• Description: Programmable Frequency Synchronous Buck Controller
• Manufacturer: Richtek Technology Corporation

RT9232A
of high-side MOSFET. The MOSFETs of linear regulator
should have wide pad to dissipate the heat. In multilayer
PCB, use one layer as power ground and have a separate
control signal ground as the reference of the all signal. To
avoid the signal ground is effect by noise and have best
load regulation, it should be connected to the ground
terminal of output. Furthermore, follows below guidelines
can get better performance of IC:
(1). The IC needs a bypassing ceramic capacitor as a R-C
filter to isolate the pulse current from power stage and
supply to IC, so the ceramic capacitor should be placed
adjacent to the IC.
(2). Place the high frequency ceramic decoupling close
to the power MOSFETs.
(3). The feedback part should be placed as close to IC as
possible and keep away from the inductor and all noise
sources.
(4). The components of bootstraps should be closed to
each other and close to MOSFETs.
(5).The PCB trace from Ug and Lg of controller to
MOSFETs should be as short as possible and can carry
1A peak current.
(6). Place all of the components as close to IC as possible.
DS9232A-02 March 2007
www.richtek.com
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