Datasheet

20 Maxim Integrated
High-Efficiency, 4A, Step-Down DC-DC
Regulators with Internal Power Switches
MAX15066/MAX15166
Layout Procedure
Careful PCB layout is critical to achieve clean and stable
operation. It is highly recommended to duplicate the
MAX15066/MAX15166 evaluation kit layout for optimum
performance. If deviation is necessary, follow these
guidelines for good PCB layout:
1) Connect input and output capacitors to the power
ground plane; connect all other capacitors to the
signal ground plane. Connect the signal ground
plane to the power ground plane at a single point
adjacent to the ground bump of the IC.
2) Place capacitors on V
DD
, IN, and SS as close as
possible to the device and the corresponding pin
using direct traces. Keep the power ground plane
and signal ground plane separate. Connect all GND
bumps at only one common point near the input
bypass capacitor return terminal.
3) Keep the high-current paths as short and wide as
possible. Keep the path of switching current short
and minimize the loop area formed by LX, the output
capacitors, and the input capacitors.
4) Connect IN, LX, and GND separately to large
copper areas to help cool the device to further improve
efficiency and long-term reliability.
5) For better thermal performance, maximize the copper
trace widths for consecutive bumps (LX, IN, GND)
using solder mask (SMD) lands.
6) Ensure all feedback connections are short and direct.
Place the feedback resistors and compensation
components as close as possible to the device.
7) Route high-speed switching nodes (such as LX and
BST) away from sensitive analog areas (such as SS,
FB, and COMP).
Chip Information
PROCESS: BiCMOS
Package Information
For the latest package outline information and land patterns, go
to www.maximintegrated.com/packages. Note that a “+”, “#”,
or “-” in the package code indicates RoHS status only. Package
drawings may show a different suffix character, but the drawing
pertains to the package regardless of RoHS status.
PACKAGE
TYPE
PACKAGE
CODE
OUTLINE
NO.
LAND
PATTERN NO.
16 WLP W162B2+1
21-0200
—
+Denotes a lead(Pb)-free/RoHS-compliant package.
Ordering Information
PART TEMP RANGE PIN-PACKAGE FREQUENCY
MAX15066EWE+ -40°C to +85°C 16 WLP 500kHz
MAX15166EWE+ -40°C to +85°C 16 WLP 350kHz