flpm8803

PM8803: Integrated PoE+ PD
interface and PWM controller
STMicroelectronics
The solution for high-efficiency PoE+ powered devices
The PM8803 combines a standard
IEEE 802.3at interface, a
current-mode PWM controller and
a best-in-class hot-swap MOSFET
in a single package.
Designed in a 100 V capable
technology, the PM8803 supports
forward active clamp as well as
synchronous flyback topologies
for high efficiency under any load
condition.
Key features
QQ
QQ
QQ
QQ
In addition, the PM8803 indicates
successful connection with
a PSE implementing 2-event
classification.
QQ
Housed in an HTSSOP20 package
for better thermal performance,
the PM8803 allows simple and
robust design of PDs that may also
be powered from auxiliary sources.
QQ
The PM8803 extends ST’s PoE/
PoE+ portfolio.
QQ
QQ
QQ
QQ
QQ
QQ
QQ
IEEE 802.3at compliant powered
device interface
Works with power supplied from
Ethernet LAN cables or from local
auxiliary sources
Integrated 100 V, 0.45 Ω, 1 A
hot-swap MOSFET
Successful IEEE 802.3at layer1
classification indicator
Accurate 140 mA typ. inrush current
level
Programmable DC current limit up
to 1 A
High-voltage start-up bias regulator
Thermal shutdown protection
Current-mode pulse width
modulator
Programmable oscillator frequency
80% maximum duty cycle with
internal slope compensation
Support for flyback, forward,
forward active clamp, flyback with
synchronous rectification
Supports both isolated and
non-isolated applications
Main applications
QQ
QQ
QQ
QQ
QQ
QQ
QQ
QQ
VoIP phones
VideoIP phones
WLAN access points
Security cameras
WiMax CPEs
RFID readers
Pico/femto cells
PoE/ PoE+ powered device
appliances
www.st.com/poe
The PM8803 integrates a
standard-compliant power over
Ethernet (PoE) interface and a
current-mode PWM controller to
simplify the design of the power supply
sections of all powered devices.
The PoE/PoE+ interface incorporates
all the functions required by the
IEEE 802.3at including detection,
classification, undervoltage lockout
(UVLO) and in-rush current limitation.
The PM8803 specifically performs
IEEE 802.3at layer1 hardware
classification scheme providing an
indication of Type 2 PSE successful
detection to the rest of the system.
The integrated switching regulator
of the PM8803 has been designed
to work with power either form the
Ethernet cable connection or from an
external power source such as an AC
adapter.
The DC-DC section of the PM8803
features a programmable oscillator
frequency, adjustable slope
compensation, dual complementary
low-side drivers, programmable dead
time and internal temperature sensor.
The PM8803 targets high-efficiency
conversion under all load conditions
supporting flyback, forward, forward
active clamp and synchronous
rectification.
VOUT
VOUT
PSE
24.9
kOhm
T2P
VB
VC
GAT1
SA
DC/DC VB
SP Hot-swap
CTL
controller
CS
DCC
GAT2
CLS
RTN1
ARTN
RTN2
VSS
VDD
IEEE
802.3at
DET interface
FRS
DT
PoE+ section with PM8803 in forward AC topology
PoE selection table
Part number
PM8800A
PM8803
Supported
standard
IEEE 802.3at,
Type 1
IEEE 802.3at,
Type 1-2
Signature
resistor
Integrated DC-DC
regulator
RDS(on) internal
HS MOSFET
Type 2 PSE
indicator
Inrush current
Max DC
current
Support for
forward AC
Auxiliary
source range
Yes
Yes
0.5
No
Programmable
800 mA
No
12 to 57 V
No
Yes
0.45
Yes
140 mA
1000 mA
Yes
12 to 57 V
© STMicroelectronics - October 2010 - Printed in Italy - All rights reserved
The STMicroelectronics corporate logo is a registered trademark of the STMicroelectronics group of companies
All other names are the property of their respective owners
Order code: FLPM88031010
For more information on ST products and solutions, visit www.st.com