S i 3 4 5 2 /5 3
Q
UAD
H
I G H
- V
O L TAG E
P
OR T
C
ONTROLLER
P
O
E+ PSE
S
Features
Each Si3452/3 high-voltage port
controller supports four PSE power
interfaces
Programmable current limits for PoE
(15.4 W), PoE+ (30 W), and
proprietary systems (up to 40 W) per
port
I
2
C interface requires no external
MCU for easy, low-cost management
of 4 to 48 ports by the host system
Unique mixed-signal IC high-voltage
component integration simplifies
design, lowers power dissipation,
minimizes external BOM, and
reduces PCB footprint
Internal low-R
ON
power FETs with
current-sense circuitry
Integrated transient voltage surge
suppressors
DC disconnect (Si3453) or
proprietary dV/dt disconnect
(Si3452) sensing methods
FOR
P
O
E
AND
Programmable architecture supports
IEEE 802.3af (PoE) and IEEE
802.3at (PoE+) PSEs
Programmable current limits for
PoE (350 mA) and PoE+
(600 mA), and custom limits to
850 mA
Per-port current and voltage
monitoring for sophisticated power
management and control
Power policing mode
Robust multi-point detection
Supports 1-Event and 2-Event
classification algorithms
Comprehensive, robust, fault-
protection circuitry
Supply under-voltage lockout
(UVLO)
Output current limit and short-
circuit protection
Foldback current limiting
Dual-threshold thermal overload
protection
Fault source reporting for
intelligent port management
Extended commercial (–10 to 85 °C)
and industrial (–40 to 85 °C)
operating temperatures
Compact, 6×6 mm
2
, 40-pin QFN
RoHS-compliant package
Ordering Information:
See page 30.
Pin Assignments
40-pin QFN
VOUT1
VOUT2
32
GND12
39
38
37
36
35
34
40
33
31
VEE2
30
29
28
27
DET1
DET2
RST
AD1
AD0
INT
VEE1
VEE
VREF
AIN
AOUT
AGND
RBIAS
AGND
NC
VEE4
1
2
3
4
5
6
7
8
9
10
19
11
12
13
14
15
16
17
18
20
VDD
DGND
AD0
AD1
AD2
AD2
AD3
RST
VEE3
AD3
Si3452
(Top View)
26
25
24
23
22
21
VDD
VOUT4
GND34
Power over Ethernet Endpoint
switches and Midspans for IEEE Std
802.3af and 802.3at
Supports high power PDs, such as:
Pan/Tilt/Zoom security cameras
802.11n WAPs
Multi-band, multi-radio WAPs
Security and RFID systems
Industrial automation systems
Networked audio
IP Phone Systems and iPBXs
Metropolitan area networked WAPs,
cameras, and sensors
WiMAX ASN/BTS and CPE/ODU
systems
See "9. Pin Descriptions" on page 27.
Rev. 1.0 4/10
Copyright © 2010 by Silicon Laboratories
VOUT3
SDA
DET4
DET3
SCL
NC
NC
Applications
Si3452/3
SILABS [ SILICON LABORATORIES ]
