MP8020

IEEE 802.3af/at/bt-Compliant,

PoE, Powered Device Interface

MP8020 Rev. 1.0

MonolithicPower.com

1

2/17/2022

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

© 2022 MPS. All Rights Reserved.

DESCRIPTION

The

MP8020

is

an

IEEE

802.3af/at/bt-

compliant, Power over Ethernet (PoE), powered

device (PD). The device supports all the

functions of IEEE 802.3af/at/bt, including

detection, 5-event classification, input current

(IIN) control, and an internal 100V hot-swap

MOSFET.

The MP8020 provides configurable inrush

current limiting during start-up and operation

current limiting when the internal MOSFET is

fully turned on. The GATE1 driver supports the

use of an external low on resistance (RDS(ON))

MOSFET for high-power design. A high power

good (PG) signal enables the use of a

downstream DC/DC converter. The MP8020

also

provides

automatic

maintain

power

signature functionality under light loads.

An auxiliary power input detector (AUX) and

GATE2 driver provide a smooth power switch

from the power-sourcing equipment (PSE) to an

auxiliary wall adapter with low power loss. The

MP8020 also features a built-in detection

resistor, thermal protection, and a wide input

under-voltage lockout (UVLO) hysteresis.

The MP8020 is available in a QFN-18

(3mmx5mm) package.

FEATURES

 Compliant with 802.3af/at/bt Specifications

 Internal Detection Resistor

 Supports Up to 71.3W Powered Device

(PD) Operation

 Internal Hot-Swap MOSFET for ≤51W

Design

 External MOSFET with GATE1 for >51W

Design

 Auxiliary Power Supply from >8.8V Adapter

 GATE2 N-Channel MOSFET Driver for

Adapter Supply

 Configurable Current Limit

 Automatic Maintain Power Signature

 PG and Allocated Power Type Indicators

 150°C Over-Temperature Protection (OTP)

 Available in a QFN-18 (3mmx5mm)

Package

APPLICATIONS

 IEEE 802.3 af/at/bt-Compliant Devices

 Security Cameras

 Video and VoIP Phones

 WLAN Access Points

 Internet of Things (IoT) Devices

 Pico Base Stations

All MPS parts are lead-free, halogen-free, and adhere to the RoHS

directive. For MPS green status, please visit the MPS website under

Quality Assurance. “MPS”, the MPS logo, and “Simple, Easy Solutions” are

trademarks of Monolithic Power Systems, Inc. or its subsidiaries.

TYPICAL APPLICATION

From

PSE

MP8020

GATE1

SRC

GATE2

VADP

VDD

VOUT

AUX

PRI

CLSB

CLSA

TYP1

BT

TYP2

ILIM

DUTY

R_MPS

GND

R1

R2

R5

From

Adapter

Q2

SENSE

PG

D1

C1

C2

R3

R4

C3

PSE Start-Up

CH2: VDD

20V/div.

CH1: VOUT

20V/div.

CH3: PG

20V/div.

CH4:

BT/TYP1/TYP2

20V/div.

200ms/div.