MP3924 datasheet(8/56 Pages) MPS

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MP3924

– QUAD-PORT IEEE 802.3AF/AT PSE CONTROLLER

MP3924 Rev. 1.0

MonolithicPower.com

7/16/2021

MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.

ELECTRICAL CHARACTERISTICS (continued)

VIN = 54V, PGND, DGND, SGND1, and SGND2 are connected together, RSENSE = 0.25Ω,

TJ = -40°C to +125°C (6), typical value is tested at TJ = 25°C, unless otherwise noted.

Parameter

Symbol

Condition

Min

Typ

Max

Units

Minimum valid detection

resistance

RGOODL

kΩ

Maximum valid detection

resistance

RGOODH

26.5

kΩ

Maximum valid capacitance

CGOOD_MAX

µF

Detection time

tDET

Second detection phase

280

310

Detection reset time

tRESET

Port reset by internal

discharge between VIN and

OUTx before detection starts

100

Midspan mode detection

delay

tMIDDLY

Re-detection interval, MID = 1

2.8

sec

Power removal detection

delay

tREMDLY

Re-detection after one power

removal event due to error

condition (ICUT, ILIM,

INRUSH), fault timer = 60ms

MID = 0, automatic and semi-

automatic mode

0.8

0.96

1.12

sec

Classification

Classification output voltage

VCLS

Test VIN to OUTx pins during

classification, load < 60mA

Classification current limit

ICLS_ILIM

Short VIN to OUTx

Class event time

tCLE

Mark event voltage

VMARK

Test VIN to OUTx pins

7.6

8.8

9.8

Mark event current limit

IMARK_ILIM

Short VIN to OUTx

Mark event time

tME

6.5

Classification current

threshold

ICLS

Class 0 to 1

5.5

6.5

7.5

Class 1 to 2

13.5

14.5

15.5

Class 2 to 3

21.5

24.5

Class 3 to 4

31.5

34.5

Class 4 to over-current (OC)

condition (or Class 5 (8))

45.5

50.5

Port start-up delay

tPON

Automatic mode from

detection ending to power

port above 21V

100

Manual mode, from command

to output port above 21V

Port shutdown delay

From command off to gate <

0.5

Start-up sequence delay (9)

From one channel detection

to the next channel detection

if the first channel powers up

in automatic mode

0.5

sec

MP3924 Datasheet(PDF) 8 Page - Monolithic Power Systems

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