MAX8524 MAXIM [Maxim Integrated Products], MAX8524 Datasheet - Page 19

• Manufacturer Part Number: MAX8524
• Description: 2- to 8-Phase VRM 10/9.1 PWM Controllers with Precise Current Sharing and Fast Voltage Positioning
• Manufacturer: MAXIM [Maxim Integrated Products]

A properly designed PC board layout is important in
any switching DC-DC converter circuit. If possible,
mount the MOSFETs, inductors, input/output capaci-
tors, and current-sense resistor on the top side of the
PC board. Connect the ground for these devices close
together on a power ground plane. Make all other
ground connections to a separate analog ground plane.
Connect the analog ground plane to power ground at a
single point.
To help dissipate heat, place high-power components
(MOSFETs and inductors) on a large PC board area, or
use a heat sink. Keep high-current traces short, wide,
and tightly coupled to reduce trace inductances and
resistances. Also, make the gate-drive connections (DH_
and DL_) short, wide, and tightly coupled to reduce EMI
and ringing induced by high-frequency gate currents.
Pin Configurations (continued)
TOP VIEW
with Precise Current Sharing and Fast Voltage
PWRGD
CS1_3-
PWM3
PWM1
COMP
CLKO
CS1+
CS3+
Applications Information
GND
CLKI
ILIM
OSC
V
REF
CC
2- to 8-Phase VRM 10/9.1 PWM Controllers
______________________________________________________________________________________
PC Board Layout Guidelines
10
11
12
13
14
1
2
3
4
5
6
7
8
9
MAX8524
QSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
PWM2
PWM4
CS4+
CS2_4-
CS2+
RS+
RS-
EN
N.C.
VID4
VID3
VID2
VID1
VID0
Use Kelvin-sense connections for the current-sense
resistors. All signal traces of the current sense and the
remote-voltage sense should be tightly coupled and as
far away as possible from the inductors and other
switching noise sources. Use the ground plane to
shield the current-sense traces and the feedback from
noise sources.
Place the REF capacitor, the V
sense decoupling capacitors, and the remote-sense
decoupling capacitors as close to the MAX8524/
MAX8525 as possible.
For an example PC board layout, refer to the MAX8525
evaluation kit.
TRANSISTOR COUNT: 9021
PROCESS: BiCMOS
Chip Information
Positioning
CC
capacitor, the current-
19