MP8020 – IEEE 802.3af/at/bt, PoE, POWERED DEVICE INTERFACE

MP8020 Rev. 1.0

MonolithicPower.com

7

2/17/2022

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ELECTRICAL CHARACTERISTICS (continued)

VDD = 54V, TJ = -40°C to +125°C (6), typical values are tested at TJ = 25°C, unless otherwise noted.

Parameter

Symbol Condition

Min

Typ

Max

Units

Maintain Power Signature

Automatic maintain power

signature current enable

threshold

IPORT-MPS Load current drops

36

mA

Automatic maintain power

signature current threshold

hysteresis

Load current rises to disable the

maintain power signature

current again

10

mA

R_MPS output voltage

1mA to 20mA

23

24

25

V

Type 1 and type 2 power

sourcing equipment (PSE),

R_MPS output duty cycle

Duty

37

%

On period

75

85

95

ms

Off period

115

140

165

ms

Type 3 and type 4 PSE,

R_MPS output duty cycle

with DUTY short to GND

Duty

6

%

On period

14

16

18

ms

Off period

210

250

290

ms

Type 3 and type 4 PSE,

R_MPS output duty cycle

with DUTY to GND via a

7.15kΩ resistor

Duty

11.5

%

On period

26

31

36

ms

Off period

200

235

270

ms

Type 3 and type 4 PSE,

R_MPS output duty cycle

with DUTY floating

Duty

17

%

On period

39

45

52

ms

Off period

190

221

260

ms

External MOSFET voltage

drop control threshold

VDS = VSENSE - VSRC

26

mV

DUTY detection current

130

165

180

μA

DUTY detection period

130

μs

DUTY voltage threshold

6% duty setting voltage range

0.8

V

11.5% duty setting voltage

range

1

2.2

V

17% duty setting voltage range2.5

V

Adapter Supply

VADP UVLO rising threshold

ADPUV-R

7.8

8.3

8.8

V

VADP UVLO falling threshold

ADPUV-F

6.5

7

7.5

V

AUX high threshold voltage

VAUX-H

1.92

2

2.08

V

AUX threshold hysteresis

VAUX-HYS

0.15

V

AUX leakage current

VAUX = 2V

1

μA

VAUX = 57V

2.5

μA

GATE2 source current

VGATE2 -VADP = 4V

20

μA

GATE2 sink current

VGATE2 -VADP = 4V

200

μA

GATE2 max driving voltage

GATE2 to VADP

6

V

GATE2 turn-on threshold

VADP - VSRC voltage after adapter

supply is enabled

0

0.45

V