19-4593; Rev 3; 3/12
High-Power, Quad, Monolithic, PSE Controllers
for Power over Ethernet
/MAX965B
General Description
Features
o IEEE 802.3af Compliant/IEEE 802.3at Compatible
o Instantaneous Readout of Port Current Through
The MAX5965A/MAX5965B are quad, monolithic, -48V
®
power controllers designed for use in IEEE 802.3af-com-
pliant/IEEE 802.3at-compatible power-sourcing equipment
(PSE). These devices provide powered device (PD) dis-
covery, classification, current limit, DC and AC load discon-
nect detections in compliance with the IEEE 802.3af
standard. The MAX5965A/MAX5965B are pin compatible
with the MAX5952/MAX5945/LTC4258/LTC4259A PSE
controllers and provide additional features.
2
I C Interface
o High-Power Mode Enables Up to 45W Per Port
o High-Capacitance Detection for Legacy Devices
o Pin Compatible with MAX5952/MAX5945/
LTC4258/LTC4259A
The MAX5965A/MAX5965B feature a high-power mode
that provides up to 45W per port. The MAX5965A/
MAX5965B provide new Class 5 and 2-event classifica-
tion (Class 6) for detection and classification of high-
power PDs. The MAX5965A/MAX5965B provide
instantaneous readout of each port current through the
I2C interface. The MAX5965A/MAX5965B also provide
high-capacitance detection for legacy PDs.
These devices feature an I2C-compatible, 3-wire serial inter-
face, and are fully software configurable and programmable.
The class-overcurrent detection function enables system
power management to detect if a PD draws more than the
allowable current. The MAX5965A/MAX5965B’s extensive
programmability enhances system flexibility, enables field
diagnosis, and allows for uses in other applications.
o Four Independent Power-Switch Controllers
o PD Detection and Classification (Including 2-
Event Classification)
o Selectable Load-Stability Safety Check During
Detection
o Supports Both DC and AC Load Removal
Detections
2
o I C-Compatible, 3-Wire Serial Interface
o Current Foldback and Duty-Cycle-Controlled
Current Limit
o Open-Drain INT Signal
o Direct Fast Shutdown Control Capability
o Special Class 5 Classification
The MAX5965A/MAX5965B provide four operating modes
to suit different system requirements. Auto mode allows
the devices to operate automatically without any software
supervision. Semi-automatic 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 soft-
ware control of the device and is useful for system diag-
nostics. Shutdown mode terminates all activities and
securely turns off power to the ports.
Ordering Information
PART
TEMP RANGE
-40°C to +85°C
0°C to +85°C
-40°C to +85°C
0°C to +85°C
PIN-PACKAGE
36 SSOP
MAX5965AEAX+
MAX5965AUAX+*
MAX5965BEAX+
MAX5965BUAX+*
36 SSOP
36 SSOP
The MAX5965A/MAX5965B provide input undervoltage
lockout (UVLO), input undervoltage detection, a load-
stability safety check during detection, input overvolt-
age lockout, overtemperature detection, output voltage
slew-rate limit during startup, power-good status, and
fault status. The MAX5965A/MAX5965B’s programma-
bility includes startup timeout, overcurrent timeout, and
load-disconnect detection timeout.
36 SSOP
+Denotes a lead(Pb)-free/RoHS-compliant package.
*Future product—contact factory for availability.
Selector Guide
AC DISCONNECT
FEATURE
PART
PIN-PACKAGE
The MAX5965A/MAX5965B are available in a 36-pin SSOP
package and are rated for both extended (-40°C to +85°C)
and upper commercial (0°C to +85°C) temperature ranges.
MAX5965AEAX+
MAX5965AUAX+
MAX5965BEAX+
MAX5965BUAX+
36 SSOP
36 SSOP
36 SSOP
36 SSOP
No
No
Applications
Power-Sourcing Equipment (PSE)
Switches/Routers
Yes
Yes
Pin Configuration appears at end of data sheet.
Midspan Power Injectors
IEEE is a registered service mark of the Institute of Electrical and Electronics Engineers, Inc.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
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