MAX5945 datasheet(2/44 Pages) MAXIM

2 / 44 page

Quad Network Power Controller

for Power-Over-LAN

_______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional

operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to

absolute maximum rating conditions for extended periods may affect device reliability.

(Voltages referenced to VEE, unless otherwise noted.)

AGND, DGND, DET_, VDD, RESET, A3, A2, A1, A0, SHD_,

OSC_IN, SCL, SDAIN, OUT_ and AUTO............-0.3V to +80V

GATE_ (internally clamped, Note 1)....................-0.3V to +11.4V

SENSE_ ..................................................................-0.3V to +24V

VDD, RESET, A3, A2, A1, A0, SHD_, OSC_IN, SCL, SDAIN and

AUTO to DGND ....................................................-0.3V to +7V

INT and SDAOUT to DGND....................................-0.3V to +12V

Maximum Current into INT, SDAOUT, DET_ .......................80mA

Maximum Power Dissipation

36-Pin SSOP (derate 11.4mW/°C above +70°C) .........941mW

Operating Temperature Ranges:

MAX5945EAX ..................................................-40°C to +85°C

MAX5945CAX .....................................................0°C to +70°C

Storage Temperature Range .............................-65°C to +150°C

Junction Temperature ......................................................+150°C

Lead Temperature (soldering, 10s) .................................+300°C

ELECTRICAL CHARACTERISTICS

(AGND = +32V to +60V, VEE = 0V, VDD to DGND = +3.3V, all voltages are referenced to VEE, unless otherwise noted. Typical

values are at AGND = +48V, DGND = +48V, VDD = (DGND + 3.3V), TA = +25°C. Currents are positive when entering the pin and

negative otherwise.)

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

UNITS

POWER SUPPLIES

VAGND

VAGND - VEE

VDGND

060

VDD to VDGND, VDGND = VAGND

1.71

5.50

Operating Voltage Range

VDD

VDD to VDGND, VDGND = VEE

3.0

5.5

IEE

OUT_ = VEE, SENSE_ = VEE, DET_ = AGND,

all logic inputs open, SCL = SDAIN = VDD,

INT and SDAOUT open; measured at AGND

in power mode after GATE_ pullup

4.2

6.8

Supply Currents

IDIG

All logic inputs high, measured at VDD

2.7

5.6

GATE DRIVER AND CLAMPING

GATE_ Pullup Current

IPU

Power mode, gate drive on, VGATE = VEE (Note 2)

-40

-50

-60

µA

Weak GATE_ Pulldown Current

IPDW

SHD_ = DGND, VGATE_ = VEE + 5V

µA

Maximum Pulldown Current

IPDS

VSENSE = 1V, VGATE_ = VEE + 2V

100

External Gate Drive

VGS

VGATE - VEE , power mode, gate drive on

CURRENT LIMIT

Current-Limit Clamp Voltage

VSU_LIM

Maximum VSENSE_ allowed during current limit,

VOUT_ = VEE (Note 3)

202

212

220

Default, class 0,

class 3, class 4

178.5

196

Class 1

Overcurrent Threshold After

Startup

VFLT_LIM

Overcurrent VSENSE_

threshold allowed for

≤ tFAULT after startup;

VOUT_ = VEE

Class 2

104

Foldback Initial OUT_ Voltage

VFLBK_ST

VOUT_ - VEE, above which the current-limit trip

voltage starts folding back

Foldback Final OUT_ Voltage

VFLBK_END

VOUT_ - VEE, above which the current-limit trip

voltage reaches VTH_FB

Note 1: GATE_ is internally clamped to 11.4V above VEE. Driving GATE_ higher than 11.4V above VEE may damage the device.

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