max5969a Maxim Integrated Products, Inc., max5969a Datasheet - Page 12

• Manufacturer Part Number: max5969a
• Description: Ieee 802.3af/at-compliant, Powered Device Interface Controllers With Integrated Power Mosfet
• Manufacturer: Maxim Integrated Products, Inc.

IEEE 802.3af/at-Compliant, Powered Device Interface
Controllers with
Figure 2. Typical Configuration When Using a 12V Wall Power Adapter
Careful PCB layout is critical to achieve high efficiency
and low EMI. Follow these layout guidelines for optimum
performance:
1) Place the input capacitor, classification resistor, and
12
transient voltage suppressor as close as possible to
the MAX5969A/MAX5969B.
-54V
_____________________________________________________________________________________
RECTIFIER
BRIDGE
RJ-45
AND
SMAJ58A
GND
Applications Information
Operation with 12V Adapter
24.9kI
68nF
R
R
CLS
DET
DET
CLS
V
SS
V
DD
Integrated Power MOSFET
Layout Procedure
MAX5969A
MAX5969B
2EC
PG
WAD
RTN
BATTERY
2) Use large SMT component pads for power dissipat-
3) Use short and wide traces for high-power paths.
4) Use the MAX5969 Evaluation Kit layout as a refer-
12V
CLASSIFICATION
(ASSERTED ON)
ing devices such as the MAX5969A/MAX5969B and
the external diodes.
ence.
2-EVENT
PROPER 2EC LOGIC WHEN
THIS CIRCUIT ACHIEVES
BATTERY IS < 12.5V
ENABLE
CONVERTER
DC-DC
IN+
IN-
GND