MP8009
Fully Integrated, 802.3af/at Compliant
PoE PD Interface with High-Efficiency
Flyback/Forward Controller
DESCRIPTION
FEATURES
The MP8009 is an integrated IEEE 802.3af/at
PoE compliant powered device (PD) power
supply converter. It includes a PD interface and
a high-efficiency flyback/forward controller.
Compatible with 802.3af/at Specifications
100V, 0.48Ω PD Integrated Pass Switch
120mA PD Inrush Current
840mA PD Operation Current Limit
Supports >8.5V Auxiliary Adapter Supply
Supports Flexible Topology Design:
o Primary-Side Regulation (PSR) for
Flyback Applications
o Secondary-Side Regulation (SSR) for
Flyback Applications
o SSR for Active Clamp Forward
Applications
2A GATE and 0.8A SYNC Drivers
160mV Switching Current-Sense Limit
Output Diode Compensation in PSR Mode
250kHz Fixed Switching Frequency
EMI Reduction with Frequency Dithering
Available in a QFN-28 (4mmx5mm)
Package
The PD interface has all the functions of IEEE
802.3af/at, including detection, 1-event and 2-
event classification, 120mA inrush current limit,
840mA operation current limit, and a 100V hot-
swap MOSFET.
The flyback/forward controller is specifically
designed to be cost-effective. It is a space-
saving isolated solution with primary-side
regulation (PSR) for flyback applications, and
high-efficiency secondary-side regulation (SSR)
for active clamped forward applications. It can
be used in SSR flyback topologies.
The MP8009 can support a front-end solution
for PoE PD applications with a minimal number
of external components. It provides Hiccup
Protection for Overload Protection (OLP),
Short-Circuit Protection (SCP), Over-Voltage
Protection (OVP), and Thermal Shutdown. It is
available in a QFN-28 (4mmx5mm) package.
APPLICATIONS
IEEE 802.3af/at-Compliant Devices
Security Cameras
Video Telephones
WLAN Access Points
Internet-of-Things (IoT) Devices
All MPS parts are lead-free, halogen-free, and adhere to the RoHS directive. For
MPS green status, please visit the MPS website under Quality Assurance.
“MPS”, the MPS logo, and “Simple, Easy Solutions” are trademarks of
Monolithic Power Systems, Inc. or its subsidiaries.
TYPICAL APPLICATION
VDD
D1
T1
VOUT
Efficiency
PSR mode, flyback, VOUT = 12V
C1
R7
C6
D3
C2
95
R3
U1
90
85
80
75
70
65
Q1
R5
T2P
GATE
SYNC
D2 C3
PG
MODE
SENSE
MP8009
R4
CLASS
VSS
VCC
FB
VSS
C4
R1
COMP
VDD=36V
VDD=48V
VDD=57V
R8
60
AUX
R6
C5
55
50
Adapter
R9
D4
R2
0
0.5
1
1.5
2
2.5
LOAD CURRENT (A)
D5
MP8009 Rev. 1.0
12/9/2020
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2020 MPS. All Rights Reserved.
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