MAX5980 Datasheet, PDF (1/49 Pages) Maxim Integrated Products – Quad, IEEE 802.3at/af PSE Controller

19-5568; Rev 1; 9/11
Quad, IEEE 802.3at/af PSE Controller
for Power-over-Ethernet
General Description
The MAX5980 is a quad, power-sourcing equipment
(PSE) power controller designed for use in IEEE^®
802.3at/af-compliant PSE. This device provides powered
device (PD) discovery, classification, current limit, and
load disconnect detection. The device supports both
fully automatic operation and software programmability.
The device also supports new 2-event classification and
Class 5 for detection and classification of high-power
PDs. The device supports single-supply operation, pro-
vides up to 70W to each port (Class 5 enabled), and still
provides high-capacitance detection for legacy PDs.
The device features an I²C-compatible, 3-wire serial
interface, and is fully software configurable and pro-
grammable. The device provides instantaneous readout
of port current and voltage through the I²C interface. The
device’s extensive programmability enhances system
flexibility, enables field diagnosis, and allows for uses in
other, nonstandard applications.
The device is available in a space-saving, 32-pin TQFN
(5mm x 5mm) power package and is rated for the auto-
motive (-40NC to +105NC) temperature range.
IEEE is a registered service mark of the Institute of Electrical and
Electronics Engineers, Inc.
Features
S IEEE 802.3at/af Compliant
S 0.25I Current-Sensing Resistor
S Up to 70W per Port for PSE Applications
S 9-Bit Port Current and Voltage Monitoring
S I²C-Compatible, 3-Wire Serial Interface
S Supports Single-Supply Operation
S High-Capacitance Detection for Legacy Devices
S Supports DC Load-Removal Detections
S Space-Saving, 32-Pin TQFN (5mm x 5mm) Power
Package
Applications
PSE-ICM
Power-Sourcing Equipment (PSE)
Switches/Routers
Midspan Power Injectors
Ordering Information
PART
TEMP RANGE
PIN-PACKAGE
MAX5980GTJ+
-40NC to +105NC
32 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Simplified Operating Circuit
AGND
EN ^{-54V VDD}
EN
AUTO
MIDSPAN
EN_CL5
A0
A1
A2
A3
MAX5980
OUT1
GATE1
OUT2
GATE2
OUT3
GATE3
OUT4
GATE4
PORT 1
OUTPUT
PORT 2
OUTPUT
PORT 3
OUTPUT
PORT 4
OUTPUT
-54V
________________________________________________________________ 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.