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MAX5981A Datasheet(PDF) 7 Page - Maxim Integrated Products |
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MAX5981A Datasheet(HTML) 7 Page - Maxim Integrated Products |
7 / 16 page IEEE 802.3af/at-Compliant, Powered Device Interface Controllers with Integrated Power MOSFET _______________________________________________________________________________________ 7 Pin Description PIN NAME FUNCTION 1 N.C. No Connection. Not internally connected. 2 VDD Positive Supply Input. Connect a 68nF (min) bypass capacitor between VDD and VSS. 3 DET Detection Resistor Input. Connect a signature resistor (RDET = 24.9kI) from DET to VDD. 4 I.C. Internally Connected. Leave unconnected. 5, 6 VSS Negative Supply Input. VSS 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. 9 WAD Wall Power Adapter Detector Input. Wall adapter detection is enabled the moment VDD - VSS 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. 10 PG 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 3 4 2 1 10 9 11 EP* 5 6 VDD 8 16 15 13 DET I.C. CLS 2EC PG WAD MAX5981A MAX5981B 7 14 N.C. TQFN 12 CONNECT TO VSS. + TOP VIEW |
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