MAX5972AETE+T【PDF 6/13 页】IC CONTROLLER INTERFACE 16TQFN

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Sheet目录43

2页 3页 4页 5页 [6页]7页 8页 9页 10页

IEEE 802.3af/at-Compliant, Powered Device Interface

Controller with Integrated Power MOSFET

6 ______________________________________________________________________________________

Pin Description

NAME

FUNCTION

1, 1316

N.C.

No Connection. Not internally connected.

Positive Supply Input. Connect a 68nF (min) bypass capacitor between V

and V

DET

Detection Resistor Input. Connect a signature resistor (R

DET

= 24.9kI) from DET to V

I.C.

Internally Connected. Leave unconnected.

5, 6

Negative Supply Input. V

connects to the source of the integrated isolation n-channel power

MOSFET.

7, 8

RTN

Drain of Isolation MOSFET. RTN connects to the drain of the integrated isolation n-channel power

MOSFET. Connect RTN to the downstream DC-DC converter ground as shown in the Typical

Application Circuit.

WAD

Wall Power Adapter Detector Input. Wall adapter detection is enabled the moment V

- V

crosses

the mark event threshold. Detection occurs when the voltage from WAD to RTN is greater than 9V.

When a wall power adapter is present, the isolation n-channel power MOSFET turns off, 2EC current

sink turns on. Connect WAD directly to RTN when the wall power adapter or other auxiliary power

source is not used.

Open-Drain Power-Good Indicator Output. PG sinks 230FA to disable the downstream DC-DC con-

verter while turning on the hot-swap MOSFET switch. PG current sink is disabled during detection,

classification, and in the steady-state power mode. The PG current sink is turned on to disable the

downstream DC-DC converter when the device is in sleep mode.

2EC

Active-Low 2-Event Classification Detect or Wall Adapter Detect Output. A 1.5mA current sink is

enabled at 2EC when a Type 2 PSE or a wall adapter is detected. When powered by a Type 2 PSE,

the 2EC current sink is enabled after the isolation MOSFET is fully on until V

drops below the UVLO

threshold. 2EC is latched when powered by a Type 2 PSE until V

drops below the reset threshold.

2EC also asserts when a wall adapter supply, typically greater than 9V, is applied between WAD and

RTN. 2EC is not latched if asserted by WAD.

CLS

Classification Resistor Input. Connect a resistor (R

CLS

) from CLS to V

to set the desired classification

current. See the classification current specifications in the Electrical Characteristics table to find the

resistor value for a particular PD classification.

Exposed Pad. Do not use EP as an electrical connection to V

. EP is internally connected to V

through a resistive path and must be connected to V

externally. To optimize power dissipation, sol-

der the exposed pad to a large copper power plane.

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