MAX8554 MAXIM [Maxim Integrated Products], MAX8554 Datasheet - Page 23

• Manufacturer Part Number: MAX8554
• Description: 4.5V to 28V Input, Synchronous PWM Buck Controllers for DDR Termination and Point-of-Load Applications
• Manufacturer: MAXIM [Maxim Integrated Products]

5) When trade-offs in trace lengths must be made, it is
4.5V to 28V Input, Synchronous PWM Buck Controllers
outside using the top copper layer, while tying in
PGND and LX inside (underneath) the 8-pin SO
package.
preferable to allow the inductor charging path to be
made longer than the discharge path. For example,
it is better to allow some extra distance between the
input capacitors and the high-side MOSFET than to
allow distance between the inductor and the low-
side MOSFET or between the inductor and the out-
put filter capacitor.
for DDR Termination and Point-of-Load Applications
TOP VIEW
EN/HSD
REFIN
______________________________________________________________________________________
FSEL
ILIM
GND
POK
VTT
REF
1
2
6
3
4
5
7
8
MAX8553
QSOP
16
15
14
13
12
11
10
9
LX
DH
BST
PGND
DL
VL
V+
VTTR
6) It may be desirable to deliberately introduce some
7) Place feedback resistors as close as possible to
8) Route high-speed switching nodes away from sen-
9) Make all pin-strap control input connections (ILIM,
TRANSISTOR COUNT: 2827
PROCESS: BiCMOS
trace length (droop resistance) between the FB
inductor node and the output filter capacitor to
meet the stability criteria (f
the IC.
sitive analog nodes.
etc.) to GND or VL close to the chip, and do not
connect to PGND.
FSEL
HSD
ILIM
GND
POK
REF
EN
FB
1
2
6
3
4
5
7
8
MAX8554
QSOP
Pin Configurations
Chip Information
ESR
< f
16
15
14
13
12
11
10
9
S
LX
DH
BST
PGND
DL
VL
V+
OUT
/ π).
23