MAX5971AETI+T Maxim Integrated Products, MAX5971AETI+T Datasheet

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MAX5971AETI+T

Manufacturer Part Number
MAX5971AETI+T
Description
IC CTRLR PD IEEE 802.3AF 28WQFN
Manufacturer
Maxim Integrated Products
Type
Power Over Ethernet Controller (PoE)r
Datasheet
1.MAX5971AETIT.pdf (22 pages)

Specifications of MAX5971AETI+T

Applications
Remote Peripherals (Industrial Controls, Cameras, Data Access)
Internal Switch(s)
Yes
Current Limit
Adjustable
Voltage - Supply
32 V ~ 60 V
Operating Temperature
-40°C ~ 85°C
Mounting Type
Surface Mount
Package / Case
28-WFQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
19-5142; Rev 1; 9/10
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.
IEEE is a registered service mark of the Institute of Electrical
and Electronics Engineers, Inc.
WiMAX is a trademark of WiMAX Forum.
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.
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
_______________________________________________________________ Maxim Integrated Products 1
General Description
Single-Port, 40W, IEEE 802.3af/at PSE
Controller with Integrated MOSFET
Applications
®
S
S
S
S
S
S
S
S
S
S
S
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
MAX5971AETI+
IEEE 802.3af/at Compliant
Up to 40W for Single-Port PSE Applications
Integrated 0.5I Power MOSFET and Sense
Resistor
PD Detection and Classification
Programmable Current Limit for Class 5 PDs
High-Capacitance Detection for Legacy Devices
Supports Both DC and AC Load Removal
Detections
Current Foldback and Duty Cycle-Controlled
Current Limit
LED Indicator for Port Status
Direct Fast-Shutdown Control Capability
Space-Saving, 28-Pin TQFN (5mm x 5mm)
Package
-54V
PART
V
V
LED
PWMEN
LEGACY
MIDSPAN
OSC
EN
Typical Operating Circuit
EE
EE_DIG
MAX5971A
-40NC to +85NC
TEMP RANGE
Ordering Information
AGND
OUTP
ILIM1
ILIM2
OUT
DET
PIN-PACKAGE
28 TQFN-EP*
Features
PSE OUTPUT

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MAX5971AETI+T Summary of contents

Page 1

... Station 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. IEEE 802.3af/at Compliant S ® ...

Page 2

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET ABSOLUTE MAXIMUM RATINGS (Voltages referenced unless otherwise noted.) EE AGND, DET, LED ..................................................-0.3V to +80V OUT ......................................................-0. OUTP .......................................................- EE_DIG ...............................................................-0.3V to +0.3V ...

Page 3

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET ELECTRICAL CHARACTERISTICS (continued 32V to 60V -40NC to +85NC, all voltages are referenced to V AGND +54V ...

Page 4

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET ELECTRICAL CHARACTERISTICS (continued 32V to 60V -40NC to +85NC, all voltages are referenced to V AGND +54V ...

Page 5

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET ELECTRICAL CHARACTERISTICS (continued 32V to 60V -40NC to +85NC, all voltages are referenced to V AGND +54V ...

Page 6

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET (T = +25°C, unless otherwise noted.) A ANALOG SUPPLY CURRENT vs. INPUT VOLTAGE 2.7 MEASURED AT AGND 2.6 2.5 2.4 2 ...

Page 7

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET (T = +25°C, unless otherwise noted.) A OVERCURRENT TIMEOUT (240Ω TO 138Ω) MAX5971A toc08 0V 0mA 20ms/div SHORT-CIRCUIT TRANSIENT RESPONSE MAX5971A toc10 0V 0mA 10µs/div ZERO-CURRENT DETECTION WAVEFORM WITH DC DISCONNECT ...

Page 8

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET (T = +25°C, unless otherwise noted.) A OVERCURRENT RESTART DELAY MAX5971A toc14 0V 0mA 400ms/div DETECTION WITH INVALID PD (25kΩ TO 10µF) MAX5971A toc16a 0V 0mA 40ms/div DETECTION WITH INVALID PD ...

Page 9

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET (T = +25°C, unless otherwise noted.) A STARTUP IN MIDSPAN WITH A VALID PD MAX5971A toc17 0V 0mA 100ms/div DETECTION IN MIDSPAN WITH INVALID PD (33kΩ) MAX5971A toc18b 0V 0mA 400ms/div ...

Page 10

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET (T = +25°C, unless otherwise noted.) A STARTUP USING 2-EVENT CLASSIFICATION WITH A VALID PD 0V 0mA 100ms/div LED DETECTION FAULT WITH PWM DISABLED MAX5971A toc22b 0V 0mA 0V 200ms/div LED ...

Page 11

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET TOP VIEW *EXPOSED PAD, CONNECT TO AGND. PIN NAME Analog Low-Side Supply Input. Bypass with an external 100V, 47FF capacitor in parallel with 100V, 0.1FF ...

Page 12

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET PIN NAME Legacy Detection Logic Input. Referenced LEGACY supply. Leave unconnected to activate the legacy PD detection. Force low to disable this function. The LEGACY logic level latches ...

Page 13

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET EN LEGACY PORT STATE REGISTER FILE MIDSPAN MACHINE (SM) CENTRAL LOGIC UNIT (CLU) INTERNAL AGND SUPPLIES ANALOG BIAS AND VOLTAGE SUPPLY REFERENCES V EE MONITOR CURRENT REFERENCES LED PWM Detailed Description ...

Page 14

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET During a reset, the MAX5971A latches in the state of MIDSPAN, LEGACY, and OSC. During normal operation, changes to these inputs are ignored. In midspan mode, the device adopts cadence timing ...

Page 15

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET Powered Device Classification (PD Classification) During the PD classification mode, the MAX5971A forces a probe voltage (-18V typ) at DET and measures the current into DET. The measured current determines the ...

Page 16

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET 80ms 0V -4V -9.3V -18V -48V V OUT Figure 1. Detection, Classification, and Port Power-Up Sequence 80ms 0V -4V -9.3V -18V -48V V OUT Figure 2. Detection, 2-Event Classification, and Port ...

Page 17

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET Overcurrent Protection The MAX5971A has an internal sense resistor, R (see the Simplified Diagram), connected between the source of the internal MOSFET and V load current. Under normal operating conditions, the ...

Page 18

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET The MAX5971A internally generates digital supplies (referenced power the internal logic circuitry. EE All logic inputs and outputs are referenced to V See the Electrical Characteristics table ...

Page 19

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET The MAX5971A also contains an internal square wave, PWM signal generator. The PWM runs at a typical fre- quency of 25kHz with an approximate typical duty cycle of 6.25%. PWMEN is ...

Page 20

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET 1N4448 47µF 100V -54V Figure 7. Typical Operating Circuit 2 (AC Load Removal Detection, Internal PWM Enabled for LED Indication, and Class 5 Detection Enabled) -54V Figure 8. Typical Operating Circuit ...

Page 21

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET Chip Information PROCESS: BiCMOS ______________________________________________________________________________________ Package Information For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates ...

Page 22

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 22 2010 Maxim Integrated Products © ...

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