max5969a Maxim Integrated Products, Inc., max5969a Datasheet - Page 7

• Manufacturer Part Number: max5969a
• Description: Ieee 802.3af/at-compliant, Powered Device Interface Controllers With Integrated Power Mosfet
• Manufacturer: Maxim Integrated Products, Inc.

IEEE 802.3af/at-Compliant, Powered Device Interface
PIN
10
––
1
2
3
4
5
6
7
8
9
NAME
WAD
N.C.
RTN
V
DET
2EC
CLS
V
I.C.
PG
EP
DD
SS
_______________________________________________________________________________________
Positive Supply Input. Connect a 68nF (min) bypass capacitor between V
Detection Resistor Input. Connect a signature resistor (R
No Connection. Not internally connected.
Internally Connected. Leave unconnected.
Negative Supply Input. V
MOSFET.
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.
Wall Power Adapter Detector Input. Wall adapter detection is enabled the moment V
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 until the hot-swap switch is fully on. PG current sink is
disabled during detection, classification, and in the steady-state power mode.
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 and latched low after the isolation MOSFET is fully on until V
the UVLO 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.
Classification Resistor Input. Connect a resistor (R
current. See the classification current specifications in the Electrical Characteristics table to find the resis-
tor value for a particular PD classification.
Exposed Pad. Do not use EP as an electrical connection to V
through a resistive path and must be connected to V
the exposed pad to a large copper power plane.
Controllers with
SS
connects to the source of the integrated isolation n-channel power
Integrated Power MOSFET
FUNCTION
CLS
) from CLS to V
SS
externally. To optimize power dissipation, solder
DET
= 24.9kI) from DET to V
SS
. EP is internally connected to V
SS
to set the desired classification
DD
and V
Pin Description
SS
DD
.
DD
- V
.
IN
SS
drops below
crosses
SS
7