MAX5971A Datasheet, PDF (1/21 Pages) Maxim Integrated Products – Single-Port, 40W, IEEE 802.3af/at PSE Controller with Integrated MOSFET

19-5142; Rev 0; 1/10
EVAALVUAAILTAIOBNLEKIT
Single-Port, 40W, IEEE 802.3af/at PSE
Controller with Integrated MOSFET
General Description
The MAX5971A is a single-port, power-sourcing equip-
ment (PSE) power controller designed for use in IEEE^®
802.3af/at-compliant PSE. This device provides powered
device (PD) discovery, classification, current limit, and
DC and AC load-disconnect detections. The MAX5971A
operates automatically without the need for any software
programming and features an integrated power MOSFET
and sense resistor. The device also supports new Class 5
and 2-event classification for detection and classification
of high-power PDs. The MAX5971A provides up to 40W
to a single port (Class 5 enabled) and still provides high-
capacitance detection for legacy PDs.
The MAX5971A provides input undervoltage lockout
(UVLO), input overvoltage lockout, overtemperature
detection, output voltage slew-rate limit during startup,
and LED status indication.
The MAX5971A is available in a space-saving, 28-pin
TQFN (5mm x 5mm) power package, and is rated for the
extended (-40NC to +85NC) temperature range.
Applications
Single-Port PSE End-Point Applications
Single-Port PSE Power Injectors (Midspan
Applications)
Switches/Routers
Industrial Automation Equipment
Wireless LAN Access Point/WiMAX™ Base
Station
Features
S IEEE 802.3af/at Compliant
S Up to 40W for Single-Port PSE Applications
S Integrated 0.5I Power MOSFET and Sense
Resistor
S PD Detection and Classification
S Programmable Current Limit for Class 5 PDs
S High-Capacitance Detection for Legacy Devices
S Supports Both DC and AC Load Removal
Detections
S Current Foldback and Duty Cycle-Controlled
Current Limit
S LED Indicator for Port Status
S Direct Fast-Shutdown Control Capability
S Space-Saving, 28-Pin TQFN (5mm x 5mm)
Package
Ordering Information
PART
TEMP RANGE PIN-PACKAGE
MAX5971AETI+
-40NC to +85NC
28 TQFN-EP*
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Typical Operating Circuit
PSE OUTPUT
AGND
-54V
VEE
OUT
VEE_DIG
OUTP
LED _MAX5971A
PWMEN
LEGACY
DET
MIDSPAN
ILIM1
OSC
ILIM2
EN
IEEE is a registered service mark of the Institute of Electrical
and Electronics Engineers, Inc.
WiMAX is a trademark of WiMAX Forum.
________________________________________________________________ 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.