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SI3402-B-GM

Description
Hot Swap Voltage Controllers PoE Powered Device (up to 15W, low-EMI)
Categorysemiconductor    Power management   
File Size555KB,22 Pages
ManufacturerSilicon Laboratories
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SI3402-B-GM Overview

Hot Swap Voltage Controllers PoE Powered Device (up to 15W, low-EMI)

SI3402-B-GM Parametric

Parameter NameAttribute value
Product AttributeAttribute Value
ManufacturerSilicon Laboratories
Product CategoryHot Swap Voltage Controllers
RoHSDetails
ProductPoE / LAN Solutions
Current Limit680 mA
Supply Voltage - Max57 V
Supply Voltage - Min2.8 V
Number of Channels1 Channel
Minimum Operating Temperature- 40 C
Maximum Operating Temperature+ 85 C
Mounting StyleSMD/SMT
Package / CaseQFN-20
PackagingTray
Input / Supply Voltage - Max57 V
Input / Supply Voltage - Min2.8 V
Moisture SensitiveYes
NumOfPackaging1
Pd - Power Dissipation1.2 W
Factory Pack Quantity490
Unit Weight0.004339 oz
S i 3 4 0 2 -B
F
U LL Y
-
IN TE GRA TE D
I E E E 8 0 2 . 3 - C
O M PL IA NT
P
O
E P D I
N T E R F A C E A N D
L
O W
- E M I S
W I T C H IN G
R
EG ULA TO R
Features
VPOSS
16
Pin-compatible replacement for
the obsolete Si3402-A
IEEE 802.3 standard-compliant
solution, including pre-standard
(legacy) PoE support
Highly-integrated IC enables
compact solution footprints

Minimal external components

Integrated diode bridges and
transient surge suppressor

Integrated switching regulator
controller with on-chip power
FET

Integrated dual current-limited
hotswap switch
Programmable classification
circuit
Incorporates switcher EMI-
reduction techniques.
Supports non-isolated and
isolated switching topologies
Comprehensive protection
circuitry

Transient overvoltage
protection

Undervoltage lockout

Early power-loss indicator

Thermal shutdown protection

Foldback current limiting
Low-profile 5 x 5 mm 20-pin QFN
RoHS-compliant
Ordering Information:
See page 19.
Pin Assignments
5 x 5 mm QFN
(Top View)
VSSA
15
VSS2
Applications
20
19
18
17
Voice over IP telephones and
adapters
Wireless access points
Security cameras
Point-of-sale terminals
Internet appliances
Network devices
High power applications
EROUT
SSFT*
VDD
1
2
3
VSS1
SWO
FB
14
CT1
VNEG
(PAD)
13
CT2
12
11
VPOSF
SP1
ISOSSFT*
4
VNEG
PLOSS
RDET
The Si3402 integrates all power management and control functions required in a
Power-over-Ethernet (PoE) powered device (PD) application. The Si3402
converts the high voltage supplied over the 10/100/1000BASE-T Ethernet
connection into a regulated, low-voltage output supply. The optimized architecture
of the Si3402 minimizes the solution footprint, reduces external BOM cost, and
enables the use of low-cost external components while maintaining high
performance. The Si3402 integrates the required diode bridges and transient
surge suppressor, thus enabling direct connection of the IC to the Ethernet RJ-45
connector. The switching power FET and all associated functions are also
integrated. The integrated switching regulator supports isolated (flyback) and non-
isolated (buck) converter topologies. The Si3402 supports IEEE 802.3 Type 1
(Class 3 and below) Powered Device applications. Standard external resistors
connected to the Si3402 provide the proper IEEE 802.3 signatures for the
detection function and programming of the requested power class. Startup circuits
ensure well-controlled initial operation of both the hotswap switch and the voltage
regulator. The Si3402 is available in a low-profile, 20-pin, 5 x 5 mm QFN package.
The Si3402-B is a pin-compatible replacement of the obsolete Si3402-A. PCB
layouts designed for Si3402-A can be reused with Si3402-B, but some component
value changes are required.
Note:
Original pin names shown for compatibil-
ity reasons, but SSFT, ISOSSFT, VPOSS,
and VSS1 are not internally connected.
Rev. 1.1 12/16
Copyright © 2016 by Silicon Laboratories
HSO
RCL
SP2
Description
5
6
7
8
9
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Si3402-B
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