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

MP8020 Rev. 1.0

MonolithicPower.com

3

2/17/2022

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PIN FUNCTIONS

Pin #

Name

Description

1

VDD

Positive power supply terminal from the Power over Ethernet (PoE) input power rail.

2

GND

Negative power supply terminal.

3

GATE2

External N-channel MOSFET GATE driver for the adapter power supply.

4

VADP

Positive power supply terminal from the adapter.

5

AUX

Adapter power input detector pin. The AUX pin configures the adapter’s auxiliary power

under-voltage lockout (UVLO) voltage. Pull down AUX internally to GND via a resistor. If

this pin is not used, pull it to GND externally.

6

R_MPS

Automatic maintain power signature load resistor connection. The R_MPS pin

generates a 24V output pulse when the maintain power signature function is triggered.

7

ILIM

Internal hot-swap MOSFET current limit configuration. See the Hot-Swap MOSFET

and Current Limit section on page 17 for more details.

8

DUTY

Automatic maintain power signature output duty setting pin. See the Automatic

Maintain Power Signature section on page 19 for more details.

9

PRI

Power-sourcing equipment (PSE) power and adapter power priority setting pin. Pull

up this pin internally to the internal 5V power source via a resistor. If PRI is low, then the

PSE power source has a higher priority.

10

CLSA

Power class signature pin. CLSA is used during the first two class events.

11

CLSB

Power class signature pin. CLSB is used during the third class event and all subsequent

class events.

12

BT

PSE type indicator. BT is an open-drain output.

13

TYP2

Allocated PSE power type indicator. TYP2 is an open-drain output.

14

TYP1

Allocated PSE power type indicator. TYP1 is an open-drain output.

15

PG

Power good (PG) indicator. PG is an open-drain output. Pull this pin active high.

16

SRC

Hot-swap MOSFET source pin. SRC is the power output from both the internal and

external hot-swap MOSFETs.

17

GATE1

External, parallel N-channel MOSFET GATE driver for the PSE power supply.

18

SENSE

External MOSFET current-sense pin. If not used, connect this pin to VDD.