MAX5965AEAX+ Maxim Integrated Products, MAX5965AEAX+ Datasheet - Page 15

• Manufacturer Part Number: MAX5965AEAX+
• Description: IC PSE CTRLR FOR POE 36SSOP
• Manufacturer: Maxim Integrated Products
• Type: Power Over Ethernet Controller (PoE)r

Specifications of MAX5965AEAX+

• Applications: IP Phones, Power over LAN, Network Routers and Switches
• Internal Switch(s): No
• Voltage - Supply: 2.4 V ~ 3.6 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 36-BSOP (0.300", 7.5mm Width)
• Product: PoE / LAN Solutions
• Supply Voltage (max): 60 V
• Supply Voltage (min): 32 V
• Power Dissipation: 1388.9 mW
• Operating Temperature Range: - 40 C to + 85 C
• Mounting Style: SMD/SMT
• Input Voltage: 60V
• Supply Current: 4.8mA
• Digital Ic Case Style: SSOP
• No. Of Pins: 36
• Uvlo: 28.5V
• Frequency: 400kHz
• Filter Terminals: SMD
• Interface: I2C
• Rohs Compliant: Yes
• Controller Type: Power Supply
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX5965A/MAX5965B are quad -48V power con-
trollers designed for use in IEEE 802.3af-compliant/pre-
IEEE 802.3at-compatible PSE. The devices provide PD
discovery, classification, current limit, DC and AC load
disconnect detections in compliance with the IEEE 802.3af
standard. The MAX5965A/MAX5965B are pin compatible
with the MAX5952/MAX5945/LTC4258/LTC4259A PSE
controllers and provides additional features.
The MAX5965A/MAX5965B feature a high-power mode,
which provides up to 45W per port. The devices allow
the user to program the current-limit and overcurrent
thresholds up to 2.5 times the default thresholds. The
MAX5965A/MAX5965B can also be programmed to
decrease the current-limit and overcurrent threshold by
15% for high operating voltage conditions to keep the
output power constant.
The MAX5965A/MAX5965B provide new Class 5 and 2-
event classification (Class 6) for detection and classifica-
tion of high-power PDs. The MAX5965A/MAX5965B
provide instantaneous readout of each port current
through the I
also provide high-capacitance detection for legacy PDs.
The MAX5965A/MAX5965B are fully software config-
urable and programmable through an I
3-wire serial interface with 49 registers. The class-over-
current detection function enables system power man-
agement to detect if a PD draws more than the
allowable current. The MAX5965A/MAX5965B’s exten-
sive programmability enhances system flexibility,
enables field diagnosis, and allows for uses in other
applications.
The MAX5965A/MAX5965B provide four operating
modes to suit different system requirements. Auto mode
allows the device to operate automatically without any
software supervision. Semi-auto mode automatically
detects and classifies a device connected to a port
after initial software activation but does not power up
that port until instructed to by software. Manual mode
allows total software control of the device and is useful
for system diagnostics. Shutdown mode terminates all
activities and securely turns off power to the ports.
The MAX5965A/MAX5965B provide input undervoltage
lockout, input undervoltage detection, a load-stability
safety check during detection, input overvoltage lockout,
overtemperature detection, output voltage slew-rate limit
during startup, power-good, and fault status. The
MAX5965A/MAX5965B’s programmability includes start-
up timeout, overcurrent timeout, and load-disconnect
detection timeout.
High-Power, Quad, Monolithic, PSE Controllers
2
C interface. The MAX5965A/MAX5965B
______________________________________________________________________________________
Detailed Description
2
C-compatible,
for Power over Ethernet
The MAX5965A/MAX5965B communicate with the sys-
tem microcontroller through an I
face. The MAX5965A/MAX5965B feature separate input
and output data lines (SDAIN and SDAOUT) for use
with optocoupler isolation. As slave devices, the
MAX5965A/MAX5965B include four address inputs
allowing 16 unique addresses. A separate INT output
and four independent shutdown inputs (SHD_) provide
fast response from a fault to port shutdown between
the MAX5965A/MAX5965B and the microcontroller. A
RESET input allows hardware reset of the device.
Reset is a condition the MAX5965A/MAX5965B enter
after any of the following conditions:
1) After power-up (V
2) Hardware reset. The RESET input is driven low and
3) Software reset. Writing a 1 into R1Ah[4] any time
4) Thermal shutdown.
During a reset, the MAX5965A/MAX5965B reset their
register map to the reset state as shown in Table 37
and latch in the state of AUTO (pin 35) and MIDSPAN
(pin 2). During normal operation, change at the AUTO
and MIDSPAN input is ignored. While the condition that
caused the reset persists (i.e. high temperature, RESET
input low, or UVLO conditions) the MAX5965A/
MAX5965B do not acknowledge any addressing from
the serial interface.
Set high anytime during normal operation to turn off
power and clear the events and status registers of the
corresponding port. Port reset only resets the events
and status registers.
In midspan mode, the device adopts cadence timing
during the detection phase. When cadence timing is
enabled and a failed detection occurs, the port waits
between 2s and 2.4s before attempting to detect again.
Midspan mode is activated by setting R11h[1] high.
The status of the MIDSPAN pin is written to R11h[1]
during power-up or after a reset. MIDSPAN is internally
pulled low by a 50kΩ resistor.
UVLO thresholds).
back high again any time after power-up.
after power-up.
EE
Port Reset (R1Ah[3:0])
and V
DD
2
C-compatible inter-
Midspan Mode
rise above their
Reset
15