rt8011 Richtek Technology Corporation, rt8011 Datasheet - Page 14

• Manufacturer Part Number: rt8011
• Description: 4mhz, Synchronous Step-down Regulator
• Manufacturer: Richtek Technology Corporation

RT8011/A
resistance of C
discharge C
by the regulator to return V
During this recovery time, V
overshoot or ringing that would indicate a stability problem.
The COMP pin external components and output capacitor
shown in Typical Application Circuit will provide adequate
compensation for most applications.
Layout Considerations
Follow the PCB layout guidelines for optimal performance
of RT8011/A.
www.richtek.com
14
A ground plane is recommended. If a ground plane layer
is not used, the signal and power grounds should be
segregated with all small-signal components returning
to the GND pin at one point that is then connected to
the PGND pin close to the IC. The exposed pad should
be connected to GND.
Connect the terminal of the input capacitor(s), C
close as possible to the PVDD pin. This capacitor
provides the AC current into the internal power
MOSFETs.
LX node is with high frequency voltage swing and should
be kept small area. Keep all sensitive small-signal nodes
away from LX node to prevent stray capacitive noise
pick-up.
Flood all unused areas on all layers with copper.
Flooding with copper will reduce the temperature rise
of powercomponents.
You can connect the copper areas to any DC net (PVDD,
VDD, VOUT, PGND, GND, or any other DC rail in your
system).
Connect the FB pin directly to the feedback resistors.
The resistor divider must be connected between V
and GND.
OUT
generating a feedback error signal used
OUT
. ΔI
LOAD
OUT
also begins to charge or
OUT
to its steady-state value.
can be monitored for
IN
, as
OUT
Figure 8. RT8011A Demo
Figure 7. RT8011 Demo Board
Board (Only WDFN-8E 3x3)
DS8011/A-00 August 2006