MAX8513 MAXIM [Maxim Integrated Products], MAX8513 Datasheet - Page 33

• Manufacturer Part Number: MAX8513
• Description: Wide-Input, High-Frequency, Triple-Output Supplies with Voltage Monitor and Power-On Reset
• Manufacturer: MAXIM [Maxim Integrated Products]

Careful PC board layout is critical to achieve low
switching losses and clean, stable operation. The
switching power stage requires particular attention.
Follow these guidelines for good PC board layout:
Place decoupling capacitors as close to the IC pins as
possible. Keep separate the power-ground plane (con-
nect to the sources of the low-side MOSFET, PGND,
and the output capacitor’s return). Connect the input
decoupling capacitors across the drain of the high-side
MOSFETs and the source of the low-side MOSFETs.
The signal-ground plane (connected to GND) is con-
nected to the rest of the circuit-ground return. The two
ground planes then connect together with a single con-
Figure 7. Base-Drive Noise Reduction
Wide-Input, High-Frequency, Triple-Output Supplies
Applications Information
______________________________________________________________________________________
PC Board Layout Guidelines
with Voltage Monitor and Power-On Reset
a) POSITIVE OUTPUT VOLTAGE
b) NEGATIVE OUTPUT VOLTAGE
MAX8513
MAX8514
DRV3P
SUP3N
DRV3N
FB3P
FB3N
C BE
CBE
R13
R14
R14
R13
R12
R12
nection at the IC. Keep the high-current paths as short
as possible. Connect the drains of the MOSFETS to a
large copper area to help in cooling the devices, further
improving efficiency and long-term reliability.
1) Ensure all feedback connections are short and
2) Route high-speed switching nodes away from sen-
3) Ensure the current-sense paths for CSP and CSN
4) A reference PC board layout included in the
V
OUT1
direct. Place the feedback resistors as close to the
IC as possible.
sitive analog areas (FB_, COMP, ILIM).
run parallel and close together to cancel any noise
pickup.
MAX8513 evaluation kit is also provided to further
aid layout.
C8
Q4
Q4
V
OUT1
C7
C7
V
OUT3P
C8
L1B
L1B
V
OUT3N
V
OUT1
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