MP8007 ― IEEE 802.3AF PD WITH 13W FLYBACK / BUCK CONVERTER

MP8007 Rev.1.0

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12

6/27/2016

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PIN FUNCTIONS

PIN#

Name

Description

1

AUX

Auxiliary power input detector. Use this pin for adaptor power supply application.

Drive VDD-AUX higher than 2.3V to disable hot-swap MOSFET and CLASS pin

function, and force T2P and PG active.

2

DET

Connect 24.9kΩ resistor between VDD and DET for PoE detection.

3, 11, 14,

15, 19, 22,

28

N/C

Not connected internally, can be connected to GND pin and exposed thermal pad in

layout.

4

VDD

Positive power supply terminal from PoE input power rail.

5

FB2

Feedback pin for non-isolated buck solution. Connect FB2 to VDD in flyback

application

6

MODE

Buck mode or flyback mode select pin. MODE is pulled up internally to VCC through

a 1.5µA current source. Float MODE for buck application mode; connect MODE to

GND for flyback application mode.

7

FB1

Feedback for fly-back solution. Connect FB1 to GND in buck application

8

ILIM

DCDC converter switching current limit program pin. Connect ILIM to GND through a

resistor to program the peak current limit.

9

AGND

Analog power return for DCDC converter control circuit. Connect to GND through

single point.

10

VCC

Supply bias voltage pin, powered through internal LDO from VIN. It is recommended

to connect a capacitor (no less than 1µF) between VCC and GND.

12,13

SW

Drain of converter switching MOSFET.

16,17

GND

Switching converter power return. Connect to RTN for PoE power supply. Exposed

thermal pad can be connected to GND plane for heat sink.

18

PG

PD supply power good indicator. This signal will enable the DCDC converter

internally. It is pulled up by internal current source in output high condition, suggest

float it in application.

20,21

RTN

Drain of PD Hot-swap MOSFET, connect GND and AGND to this pin.

23,24

VSS

Negative power supply terminal from PoE input power rail.

25

FTY

Factory use only, must be connected to VSS in application.

26

CLASS

Connect resistor from CLASS to VSS to program classification current.

27

T2P

Type 2 PSE indicator, open-drain output. Pulled low to VSS indicates the presence of

a Type-2 PSE or AUX is enabled.