MAX5952AEAX+ Maxim Integrated Products, MAX5952AEAX+ Datasheet - Page 34

• Manufacturer Part Number: MAX5952AEAX+
• Description: IC PSE CNTRLR FOR POE 36-SSOP
• Manufacturer: Maxim Integrated Products
• Type: Power Over Ethernet Controller (PoE)r

Specifications of MAX5952AEAX+

• Applications: Remote Peripherals (Industrial Controls, Cameras, Data Access)
• Internal Switch(s): No
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-BSOP (0.300", 7.5mm Width)
• Product: Controllers & Switches
• Supply Voltage (max): 5.5 V
• Supply Voltage (min): 1.71 V
• Power Dissipation: 941 mW
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Supply Current: 4.8 mA
• Input Voltage: 60V
• Digital Ic Case Style: SSOP
• No. Of Pins: 36
• Uvlo: 28.5V
• Frequency: 400kHz
• Interface: I2C
• Termination Type: SMD
• Rohs Compliant: Yes
• Filter Terminals: SMD
• Controller Type: Power Over Ethernet PD
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

High-Power, Quad, PSE Controller
for Power-Over-Ethernet
TSTART[1,0] (Table 20a) programs the startup timers.
Startup time is the time the port is allowed to be in cur-
rent limit during startup. TFAULT[1,0] programs the
fault time. Fault time is the time allowed for the port to
be in current limit during normal operation. RSTR[1,0]
programs the discharge rate of the TFAULT_ counter
and effectively sets the time the port remains off after
an overcurrent fault. TDISC[1,0] programs the load dis-
connect detection time. The device turns off power to
the port if it fails to provide a minimum power mainte-
nance signal for longer than the load disconnect detec-
tion time (TDISC).
Table 20a. Timing Register
Table 20b. Startup, Fault, and Load Disconnect Timer Values for Timing Register
34
RSTR[1]
RSTR[0]
TSTART[1]
TSTART[0]
TFAULT[1]
TFAULT[0]
TDISC[1]
TDISC[0]
(ADDRESS = 16h)
______________________________________________________________________________________
SYMBOL
BIT [1:0]
00
01
10
11
ADDRESS = 16h
16 x t
32 x t
64 x t
0 x t
BIT
RSTR
7
6
5
4
3
2
1
0
FAULT
FAULT
FAULT
FAULT
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
t
DISC
1 / 2 x t
1 / 4 x t
2 x t
nominal (350ms, typ)
DISC
Restart timer programming bit 1
Restart timer programming bit 0
Startup timer programming bit 1
Startup timer programming bit 0
Overcurrent timer programming bit 1
Overcurrent timer programming bit 0
Load disconnect timer programming bit 1
Load disconnect timer programming bit 0
DISC
DISC
t
DISC
nominal
nominal
nominal
Set the bits in R16h to scale the t
t
Electrical Characteristics table.
When the MAX5952 shuts down a port due to an
extended overcurrent condition (either during startup or
normal operation), if RSTR_EN is set high, the part does
not allow the port to power back on before the restart
timer (Table 20b) returns to zero. This effectively sets a
minimum duty cycle that protects the external MOSFET
from overheating during a prolonged output overcur-
rent conditions. A reset sets R16h = 00h.
DISC
t
START
to a multiple of their nominal value specified in the
1 / 2 x t
2 x t
4 x t
nominal (60ms, typ)
START
START
START
t
DESCRIPTION
START
nominal
nominal
nominal
t
FAULT
1 / 2 x t
2 x t
4 x t
START
nominal (60ms, typ)
FAULT
FAULT
FAULT
t
FAULT
, t
FAULT
nominal
nominal
nominal
, and