Datasheet

18Maxim Integrated
MAX5988A/MAX5988B
IEEE 802.3af-Compliant, High-Efficiency, Class 1/Class 2,
Powered Devices with Integrated DC-DC Converter
Typical Application Circuits (continued)
Figure 4. MAX5988A/MAX5988B Buck Regulator and Adjustable LDO Output
MAX5988A
MAX5988B
VDRV
CLASS2
MPS
V
DD
V
CC
WAD
WK
SL
LDO_IN
RREF
GND PGND
ULP
AUX
LX
FB
LDO_OUT
LDO_FB
LED
L0
47µH
C1
68nF
C3
1µF
R1
7.5k
I
R
SL
60.4kI
0I
TO µP OPEN-DRAIN OUTPUTS
OR PULLDOWN SWITCHES
R
SIG
24.9kI
R2
2.49k
I
5V
OUTPUT
ADJ_LDO_OUT
TO 5V OUTPUTS
C2
10µF
2.2µF
R3
R4
RJ45 AND
BRIDGE
RECTIFIER
C6
1µF
C5
1µF
C4
100µF