MP3924 datasheet(10/56 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

Short circuit fast-off

threshold

VSCP

ILIMx bit = 0

212

ILIMx bit = 1

425

Sense pin bias current

-1

µA

Thermal shutdown (7)

150

°C

Thermal shutdown

hysteresis (7)

°C

Total Load Power Limit

Load power limit on all four

ports

PMAX

RMAX = 49.9

kΩ

49.9

RMAX

= 120kΩ

120

Maximum load capability on

all four ports

PMAX_LIMT

Float the PMAX pin

204.8

Maximum load power

protection delay

tMAX_DLY

TPMAX bit = 10

100% x PMAX < load < 150% x

PMAX

Load > 150% x PMAX

DC Load Disconnection

DC disconnect hold

threshold

VDCHOLD

Decrease output load until

output port power off

1.25

1.875

2.5

DC connect power time

tDCON

Load time to reset tDCOFF timer

37.5

43.75

DC disconnect power

remove time

tDCOFF

Time from load < VDCHOLD to

gate off

300

350

400

Analog-to-Digital Converter (ADC)

ADC resolution

bits

Max ADC current range

ADC results = 1 1111 1111

(2.4mA/count)

1.216

Max ADC voltage range

ADC results = 1 1111 1111

(0.15V/count)

76.65

ADC junction temperature

range

ADC results = 0 0000 0000 to

1 1111 1111

(0.4°C/count)

-40

+164.4

°C

Max ADC PMAX setting

range

ADC results = 1 1111 1111

(0.4W/count)

204.8

Current conversion

I = 600mA

254

count

Voltage conversion

V = 44V

293

count

V = 57V

380

count

Temperature conversion (7)

TJ = 25°C

163

count

TJ = 125°C

413

count

PMAX setting conversion

RMAX = 49.9

kΩ

125

count

RMAX

= 120kΩ

300

count

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