MAX6746KA46+T Maxim Integrated, MAX6746KA46+T Datasheet

MAX6746KA46+T

Manufacturer Part Number

MAX6746KA46+T

Description

Supervisory Circuits

Manufacturer

Maxim Integrated

Series

MAX6746, MAX6747, MAX6748, MAX6749, MAX6750, MAX6751, MAX6752, MAX6753r

Datasheet

1.MAX6746KA46T.pdf (22 pages)

Specifications of MAX6746KA46+T

Number Of Voltages Monitored

Monitored Voltage

1.575 V to 5 V

Undervoltage Threshold

4.533 V

Overvoltage Threshold

4.718 V

Output Type

Active Low, Push-Pull

Manual Reset

Resettable

Watchdog

Battery Backup Switching

No Backup

Power-up Reset Delay (typ)

9.487 ms

Supply Voltage - Max

5.5 V

Maximum Operating Temperature

+ 125 C

Mounting Style

SMD/SMT

Package / Case

SOT-23

Chip Enable Signals

Maximum Power Dissipation

714 mW

Minimum Operating Temperature

- 40 C

Power Fail Detection

Supply Current (typ)

5 uA

Supply Voltage - Min

1 V

Current page: 1 of 22
Download datasheet (3Mb)

19-6142; Rev 0; 12/11

The MAX5984 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 MAX5984

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 MAX5984 provides up to 40W to

a single port (Class 5 enabled) and still provides high-

capacitance detection for legacy PDs.

The MAX5984 provides input undervoltage lockout

(UVLO), input overvoltage lockout, overtemperature

detection, output voltage slew-rate limit during startup,

and LED status indication.

The MAX5984 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.

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 is a registered service mark of the Institute of Electrical and Electronics Engineers, Inc.

WiMAX is a registered service mark of WiMAX Forum Corp.

+Denotes a lead(Pb)-free/RoHS-compliant package.

*EP = Exposed pad.

**Future product—Contact factory for availability.

MAX5984AETI+

MAX5984BETI+** 2-EVENT

MAX5984CETI+**

MAX5984DETI+

PART

Single-Port PSE End-Point Applications

Single-Port PSE Power Injectors (Midspan

Applications)

PoE Repeaters

Switches/Routers

Industrial Automation Equipment

Wireless LAN Access Point/WiMAX® Base

Stations

_______________________________________________________________ Maxim Integrated Products 1

2-EVENT

SELECT

PWMEN

LSCEN

PIN-

Ordering Information

General Description

Single-Port, 40W, IEEE 802.3af/at PSE

-40NC to +85NC 28 TQFN-EP*

TEMP RANGE

Controller with Integrated MOSFET

Applications

PIN-

PACKAGE

S IEEE 802.3af/at Compliant

S Up to 40W for Single-Port PSE Applications

S Integrated 0.5I Power MOSFET and Sense

S 2-Event Pin-Select (MAX5984A/MAX5984B)

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

S Current Foldback and Duty Cycle-Controlled

S LED Indicator for Port Status

S Direct Fast-Shutdown Control Capability

S Space-Saving, 28-Pin TQFN (5mm x 5mm)

Resistor

Detections

Current Limit

Package

-54V

Typical Operating Circuit

LED

2-EVENT

LEGACY

MIDSPAN

OSC

EE_DIG

MAX5984A

AGND

OUTP

ILIM1

ILIM2

OUT

DET

Features

PSE OUTPUT

Related parts for MAX6746KA46+T

MAX6746KA46+T Summary of contents

Page 1

... IEEE is a registered service mark of the Institute of Electrical and Electronics Engineers, Inc. WiMAX is a registered service mark of WiMAX Forum Corp. _______________________________________________________________ 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. ...

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) 0V 0mA 20ms/div SHORT-CIRCUIT TRANSIENT RESPONSE 0V 0mA 10µs/div ZERO-CURRENT DETECTION WAVEFORM WITH DC DISCONNECT ENABLED 0V 0mA 40ms/div ...

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 0V 0mA 400ms/div DETECTION WITH INVALID PD (25kΩ TO 10µF) MAX5984 toc16a 0V 0mA 40ms/div DETECTION WITH INVALID PD (33kΩ) MAX5984 ...

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 0V 0mA 100ms/div DETECTION IN MIDSPAN WITH INVALID PD (33kΩ) MAX5984 toc18b 0V 0mA 400ms/div CLASSIFICATION WITH ...

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 0V 0mA 0V 200ms/div LED OVERCURRENT FAULT ...

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 Detection Collision Avoidance Logic Input. Referenced the digital supply. Leave unconnected to activate the detection collision avoidance circuitry 7 MIDSPAN for midspan PSE systems. Force low ...

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 2-EVENT/PWMEN/LSCEN Detailed Description ...

Page 14

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET During a reset, the MAX5984 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 PD Classification During the PD classification mode, the MAX5984 forces a probe voltage (-18V typ) at DET and measures the current into DET. The measured current determines the class of 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 MAX5984 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 MAX5984 internally generates digital supplies (ref- erenced power the internal logic circuitry. All EE logic inputs and outputs are referenced to V Electrical Characteristics table for ...

Page 19

Single-Port, 40W, IEEE 802.3af/802.3at PSE Controller with Integrated MOSFET The MAX5984 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 (footprints www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code ...

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 2011 Maxim Integrated Products © ...

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