Rainbow-electronics MAX5945 Manual de usuario descargar pdf (Pagina 2)

MAX5945

Quad Network Power Controller

for Power-Over-LAN

2 _______________________________________________________________________________________

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 V

, unless otherwise noted.)

AGND, DGND, DET_, V

, 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

, 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, V

= 0V, V

to DGND = +3.3V, all voltages are referenced to V

, unless otherwise noted. Typical

values are at AGND = +48V, DGND = +48V, V

= (DGND + 3.3V), T

= +25°C. Currents are positive when entering the pin and

negative otherwise.)

PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS

POWER SUPPLIES

AGND

- V

32 60

DGND

060

to V

DGND

= V

AGND

1.71 5.50

Operating Voltage Range

to V

DGND

= V

3.0 5.5

OUT_ = V

, SENSE_ = V

, DET_ = AGND,

all logic inputs open, SCL = SDAIN = V

INT and SDAOUT open; measured at AGND

in power mode after GATE_ pullup

4.2 6.8

Supply Currents

DIG

All logic inputs high, measured at V

2.7 5.6

GATE DRIVER AND CLAMPING

GATE_ Pullup Current I

Power mode, gate drive on, V

GATE

= V

(Note 2) -40 -50 -60 µA

Weak GATE_ Pulldown Current I

PDW

SHD_ = DGND, V

GATE_

= V

+ 5V 30 40 50 µA

Maximum Pulldown Current I

PDS

SENSE

= 1V, V

GATE_

= V

+ 2V 100 mA

External Gate Drive V

GATE

- V

, power mode, gate drive on 9 10 11 V

CURRENT LIMIT

Current-Limit Clamp Voltage V

SU_LIM

Maximum V

SENSE_

allowed during current limit,

OUT_

= V

(Note 3)

202 212 220 mV

Default, class 0,

class 3, class 4

178.5 196

Class 1 49 61

Overcurrent Threshold After

Startup

FLT_LIM

Overcurrent V

SENSE_

threshold allowed for

t ≤ t

FAULT

after startup;

OUT_

= V

Class 2 90 104

Foldback Initial OUT_ Voltage V

FLBK_ST

OUT_

- V

, above which the current-limit trip

voltage starts folding back

30 V

Foldback Final OUT_ Voltage V

FLBK_END

OUT_

- V

, above which the current-limit trip

voltage reaches V

TH_FB

50 V

Note 1: GATE_ is internally clamped to 11.4V above V

. Driving GATE_ higher than 11.4V above V

may damage the device.

1 2 3 4 5 6 7 ... 43 44

Quad Network Power Controller 1

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Rainbow-electronics MAX5945 Manual de usuario Pagina 2

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