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MAX5953DUTM+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27
MAX5953A/MAX5953B/MAX5953C/MAX5953D
IEEE 802.3af PD Interface and PWM Controllers
with Integrated Power MOSFETs
22 ______________________________________________________________________________________
Block Diagrams
V+
UVLO
V+
UVLO*
*MAX5953A/MAX5953C ONLY.
**MAX5953C/MAX5953D ONLY.
***MAX5953A/MAX5953B ONLY.
GATE
MAX5953A
MAX5953B
MAX5953C
MAX5953D
CLASSIFICATION
RCLASS
PGOOD**
6.8V
EN
REF
2.4V
REF
2.4V, 0.8
HYST
21.8V
39V
200mV
V
EE
V
GATE
, 6V
1.2V, REF
5V, REF
Q4
PGOOD***
OUT
Q3
Q1
0.6Ω
Q2
38Ω
EN
Figure 8. Powered Device Interface Block Diagram
MAX5953A/MAX5953B/MAX5953C/MAX5953D
IEEE 802.3af PD Interface and PWM Controllers
with Integrated Power MOSFETs
______________________________________________________________________________________ 23
Figure 9. DC-DC Converter Block Diagram (Voltage-Mode PWM Controller and Two-Switch Power Stage)
OVT
DCUVLO
REFOK
REGOK
OVRLD
T
T
5V
5V
80µA
33µA
IFLT
5V
OVRLD
CPWM
ILIM
DCUVLO
REGOUT
RCFF
FLTINT
RAMP
OPTO
CSS
GND
INBIAS
HVIN
DCUVLO
PPWM
BST
XFRMRH
DRVIN
XFRMRL
DRNH
SRC
PGND
RTCT
CS
REGOK
REG
OVT
REFOK
REF
(1.25V)
7.5V
50Ω
GND
Q
D
R
Q
R
T-FF
SHDN
OSC
50Ω
GND
R
S
Q
CLK
THERMAL
SHUTDOWN
OVT
1.25V
DCUVLO
80ns
DELAY
LEADING-
EDGE
DELAY
ONE
SHOT
LEVEL
SHIFT
10MHz
PGND
150mV
QH
QB
QL
0.4Ω
30Ω
0.4Ω
MAX5953A
MAX5953B
MAX5953C
MAX5953D
2.7V/1.9V
Block Diagrams (continued)
MAX5953A/MAX5953B/MAX5953C/MAX5953D
IEEE 802.3af PD Interface and PWM Controllers
with Integrated Power MOSFETs
24 ______________________________________________________________________________________
Typical Operating Circuit
PGOOD
V+
UVLO
R1*
R3
(R
DISC
)
25.5kΩ
C1
68nF
D1
60V
-48V
RTN
-48V
R2*
R
RCLASS
4
6
8
RCLASS
18
DCUVLO
37
HVIN
39
DRNH
PPWM
BST
33, 34
21
36
XFRMRH
31, 32
XFRMRL
28, 29
INBIAS
40
V
EE
10
RCFF
44
RAMP
45
DRVIN
30
GATE
9
OUT
16
REGOUT
FLTINT
43
42 24
RTCT
CSS
22
GND
25
OPTO
41
23
PGND
PGND
E
U2
FOD2712
C
LED
FB
GND
COMP
20
CS
26, 27
SRC
OUT
SGND
MAX5953A
U1
*R1 AND R2 ARE OPTIONAL AND WHEN USED, THEY MUST TOTAL 25.5kΩ AND REPLACE R3, 25.5kΩ.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27

MAX5953DUTM+T

Mfr. #:
Buy MAX5953DUTM+T
Manufacturer:
Maxim Integrated
Description:
Switching Controllers IEEE 802.3af PD Int & PWM Controlle
Lifecycle:
New from this manufacturer.
Delivery:
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