IEEE 802.3af/at-Compliant, Powered Device Interface
Controllers with Integrated Power MOSFET
Simplified Block Diagram
V DD
V DD
22.8V/22V
EN
CLASSIFICATION
1.23V
CLS
V DD
5V
5V REGULATOR 1.23V
D
SET
Q
D
SET
Q
PSE 2
2EC
V DD
CLR
Q
CLR
Q
1.5mA
11.6V/4V
DET
46μA
11.6V/10.8V
5V
PG
V DD
THERMAL
SHUTDOWN
95ms
V ON /V OFF
V DD
WAPD
230μA
WAD
HSON
R
S
Q
4V
9V
15V
V SS
I SWITCH
K x I SWITCH
ISOLATION
SWITCH
V ON /V OFF = 38.6V/31V FOR MAX5969B
V ON /V OFF = 35.4V/31V FOR MAX5969A
RTN
I REF
1/K
S
I0
I1
135mA
760mA
MAX5969A
MAX5969B
MUX
8
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