MAX5953DUTM+【PDF 2/27 页】IC INTERFACE 802.3AF 48TQFN

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IEEE 802.3af PD Interface and PWM Controllers

with Integrated Power MOSFETs

2 _______________________________________________________________________________________

ABSOLUTE MAXIMUM RATINGS

ELECTRICAL CHARACTERISTICS

= (V+ - V

) = 48V, GATE = PGOOD = PGOOD = unconnected, GND = OUT, HVIN = V+, UVLO = V

, T

= 0癈 to +125癈, unless

otherwise noted. Typical values are at T

= +25癈. All voltages are referenced to V

, unless otherwise noted.) (Note 1)

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.

V+ to V

................................................................-0.3V to +90V

OUT, PGOOD, PGOOD to V

.....................-0.3V to (V+ + 0.3V)

RCLASS, GATE to V

...........................................-0.3V to +12V

UVLO to V

............................................................ -0.3V to +8V

PGOOD to OUT........................................... -0.3V to (V+ + 0.3V)

HVIN, INBIAS, DRNH, XFRMRH,

XFRMRL to GND.................................................-0.3V to +80V

BST to GND........................................................... -0.3V to +95V

BST to XFRMRH .................................................... -0.3V to +12V

PGND to GND .......................................................-0.3V to +0.3V

DCUVLO, RAMP, CSS, OPTO, FLTINT, RCFF,

RTCT to GND..................................................... -0.3V to +12V

SRC, CS to GND...................................................... -0.3V to +6V

REGOUT, DRVIN to GND.......................................-0.3V to +12V

REGOUT to HVIN .................................................. -80V to +0.3V

REGOUT to INBIAS ............................................... -80V to +0.3V

PPWM to GND....................................-0.3V to (V

REGOUT

+ 0.3V)

Maximum Input/Output Current (Continuous)

OUT to V

....................................................................500mA

V+, RCLASS to V

.........................................................70mA

UVLO, PGOOD, PGOOD to V

.....................................20mA

GATE to V

....................................................................80mA

REGOUT to GND ............................................................50mA

DRNH, XFRMRH, XFRMRL, SRC to GND (Average),

= +125癈..................................................................0.9A

PPWM to GND ..............................................................?0mA

Continuous Power Dissipation* (T

= +70癈)

48-Pin TQFN 7mm X 7mm

(derate 27.8mW/癈 above +70癈).............................2222mW

?/DIV>

................................................................................36癈/W

Operating Ambient Temperature Range ................0癈 to +85癈

Operating Junction Temperature Range..............0癈 to +125癈

Junction Temperature......................................................+150癈

Storage Temperature Range.............................-60癈 to +150癈

Lead Temperature (soldering, 10s).................................+300癈

PARAMETER

SYMBOL

CONDITIONS

MIN

TYP

MAX

NIT

POWERED DEVICE (PD) INTERFACE

DETECTION MODE

Input Offset Current

OFFSET

= 1.4V to 10.1V (Note 2)

礎

Effective Differential Input

Resistance (Note 3)

= 1.4V, up to 10.1V with 1V step

550

CLASSIFICATION MODE

Classification Current Turn-Off

Threshold

TH CLASS

rising (Note 4)

20.8

21.8

22.5

Class 0, R

RCLASS

= 10k&

Class 1, R

RCLASS

= 732&

9.17

11.83

Class 2, R

RCLASS

= 392&

17.29

19.71

Class 3, R

RCLASS

= 255&

26.45

29.55

Classification Current

CLASS

= 12.6V

to 20V,

DISC

25.5k&

(Notes 5, 6)

Class 4, R

RCLASS

= 178&

36.6

41.4

POWER MODE

Operating Supply Voltage

= (V+ - V

)

Operating Supply Current

Measure at V+, not including R

DISC

GATE = V

, HVIN = GND = OUT

0.4

MAX5953A/MAX5953C

37.4

38.6

40.2

Default Power Turn-On Voltage

UVLO ON

increasing

MAX5953B/MAX5953D

34.3

35.4

36.9

Default Power Turn-Off Voltage

UVLO OFF

decreasing, MAX5953A/MAX5953C

*As per JEDEC 51 standard.

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