MAX5981BETE+【PDF 7/16 页】IC CTRLR PD IEEE 802.3AF 16TQFN

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Sheet目录43

3页 4页 5页 6页 [7页]8页 9页 10页 11页

IEEE 802.3af/at-Compliant, Powered Device Interface

Controllers with Integrated Power MOSFET

_______________________________________________________________________________________ 7

Pin Description

NAME

FUNCTION

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 converter

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

tion, 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.

Pin Configuration

EP*

DET

I.C.

CLS

2EC

WAD

MAX5981A

MAX5981B

N.C.

TQFN

CONNECT TO V

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