Rainbow Electronics MAX5969B - Manual

_______________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
_______________________________________________________________ Maxim Integrated Products 1
IEEE 802.3af/at-Compliant, Powered Device Interface
Controllers with Integrated Power MOSFET
MAX5969A/MAX5969B
General Description
The MAX5969A/MAX5969B provide a complete interface
for a powered device (PD) to comply with the IEEE®
802.3af/at standard in a power-over-Ethernet (PoE) sys-
tem. The MAX5969A/MAX5969B provide the PD with a
detection signature, classification signature, and an inte-
grated isolation power switch with inrush current control.
During the inrush period, the MAX5969A/MAX5969B limit
the current to less than 180mA before switching to the
higher current limit (720mA to 880mA) when the isolation
power MOSFET is fully enhanced. The devices feature
an input UVLO with wide hysteresis and long deglitch
time to compensate for twisted-pair cable resistive drop
and to assure glitch-free transition during power-on/-off
conditions. The MAX5969A/MAX5969B can withstand up
to 100V at the input.
The MAX5969A/MAX5969B support a 2-event classifica-
tion method as specified in the IEEE 802.3at standard
and provide a signal to indicate when probed by Type 2
power-sourcing equipment (PSE). The devices detect
the presence of a wall adapter power-source connec-
tion and allow a smooth switchover from the PoE power
source to the wall power adapter.
The MAX5969A/MAX5969B also provide a power-good
(PG) signal, two-step current limit and foldback, over-
temperature protection, and di/dt limit.
The MAX5969A/MAX5969B are available in a space-sav-
ing, 10-pin, 3mm x 3mm, TDFN power package. These
devices are rated over the -40NC to +85NC extended
temperature range.
Applications
IEEE 802.3af/at Powered Devices
IP Phones, Wireless Access Nodes, IP Security
Cameras
WiMAXK Base Station
Features
S IEEE 802.3af/at Compliant
S 2-Event Classification
S
Simplified Wall Adapter Interface
S PoE Classification 0 to 5
S 100V Input Absolute Maximum Rating
S
Inrush Current Limit of 180mA Maximum
S Current Limit During Normal Operation Between
720mA and 880mA
S Current Limit and Foldback
S Legacy UVLO at 36V (MAX5969A)
S IEEE 802.3af/at-Compliant, 40V UVLO (MAX5969B)
S
Overtemperature Protection
S Thermally Enhanced, 3mm x 3mm, 10-Pin TDFN
19-5008; Rev 0; 12/09
+Denotes a lead(Pb)-free/RoHS-compliant package.
*EP = Exposed pad.
Ordering Information
Pin Configuration
IEEE is a registered service mark of the Institute of Electrical
and Electronics Engineers, Inc.
WiMAX is a trademark of WiMAX Forum.
EVALUATION KIT
AVAILABLE
PART TEMP RANGE
PIN-
PACKAGE
UVLO
THRESHOLD
(V)
MAX5969AETB+ -40NC to +85NC 10 TDFN-EP* 35.4
MAX5969BETB+ -40NC to +85NC 10 TDFN-EP* 38.6
1
3
4
10
8
7
CLS
PG
WAD
V DD
N.C.
I.C.
EP*
*EP = EXPOSED PAD. CONNECT TO V SS .
MAX5969A
MAX5969B
2 9 2EC DET
5 6 RTN V SS
TDFN
(3mm × 3mm)
TOP VIEW
+