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PDF SI3462 Data sheet ( Hoja de datos )

Número de pieza SI3462
Descripción SINGLE-PORT IEEE 802.3AT POE/POE+ PSE INTERFACE
Fabricantes Silicon Laboratories 
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Si3462
SINGLE-PORT IEEE 802.3AT POE/POE+ PSE INTERFACE
Features
IEEE 802.3atTM compliant PSE
Short-circuit output fault
Autonomous operation requires no
protection
host processor interface
LED status signal (detect,
Complete reference design
power good, output fault)
available, including Si3462 controller UNH Interoperability Test Lab
and schematic:
report available
Low-cost BOM
Extended operating range
Compact PCB footprint
(–40 to +85 °C)
Operates directly from a +50 V 11-Pin Quad Flat No-Lead (QFN)
isolated supply
package
Supports up to 30 W maximum
Tiny 3x3 mm PCB footprint;
output power (Class 4)
RoHS-compliant
Robust 3-point detection algorithm No-classify modes force power
eliminates false detection events
after valid detection
IEEE-compliant disconnect
Eliminates 10 BOM
Inrush current control
components
Applications
IEEE 802.3at endpoints and
midspans
Environment A and B PSEs
Embedded PSEs
Set-top boxes
FTTH media converters
Cable modem and DSL gateways
Description
The Si3462 is a single-port power management controller for IEEE 802.3at-
compliant Power Sourcing Equipment (PSE). The Si3462 can be powered
from a 50 V input using a shunt regulator, or, to save power, it can be powered
from 50 V and 3.3 V power supplies. The IEEE-required Powered Device (PD)
detection feature uses a robust 3-point algorithm to avoid false detection
events. The Si3462's reference design kit also provides full IEEE-compliant
classification and PD disconnect. Intelligent protection circuitry includes input
under-voltage lockout (UVLO), classification-based current limiting, and output
short-circuit protection. The Si3462 is designed to operate completely
independently of host processor control. An LED status signal is provided to
indicate the port status, including detection, power good, and output fault
event information. The Si3462 is pin-programmable to support four available
power levels, endpoint and mid-span applications, and auto-retry or restart
after disconnect functions. A comprehensive reference design kit is available
(Si3462-EVB), including a complete schematic and bill of materials. The
Si3462 also features “no-classify” modes, for circumstances where detection
is desired but classification steps can be skipped. Example applications
include dedicated, point-to-point connections for IP cameras, point-of-sale
terminals, and wireless access points where the application power
requirements are well understood. These modes allow elimination of
classification-related components from the bill of materials.
Pin Assignments
Si3462
CLSMARK 1
DC1 2
VDD 3
DC2 4
CLSMODE 5
GND
10 STATUS
9 ISENSE
8 RST
7 VSENSE
6 DETA
11-pin QFN (3x3 mm)
Top View—Pads on bottom of package
Rev. 1.0 11/11
Copyright © 2011 by Silicon Laboratories
Si3462

1 page




SI3462 pdf
Si3462
2. Electrical Specifications
The following specifications apply to the Si3462 controller. Refer to Tables 3 and 6 and the Si3462-EVB User's
Guide and schematics for additional details about the electrical specifications of the Si3462-EVB reference design.
Table 1. Recommended Operating Conditions
Description
Symbol
Test Conditions
Min Typ Max Unit
Operating Temperature Range
Thermal Impedance
VDD Input Supply Voltage
TA –40 25 +85 °C
JA
No airflow
— 75 — °C/W
VDD
During all operating modes
(detect, classification, disconnect)
2.7
3.3
3.6
V
Table 2. Electrical Characteristics*
Description
Symbol
Test Conditions
Min Typ
Digital Pins: CLSMARK, DC1, DC2, CLSMODE, STATUS (Output mode), RST
Output High Voltage
VOH
IOH = –3 mA
IOH = –10 µA
Output Low Voltage
VOL
IOL = 8.5 mA
IOL = 10 µA
Input High Voltage
VIH Any digital pin
Input Low Voltage
VIL Any digital pin
Input Leakage Current
IIL
VIN = 0 V
Analog Pins: ISENSE, VSENSE, DETA, STATUS (Input mode)
0.7 x VDD
VDD – 0.1
0.7 x VDD
±1
Input Capacitance
—5
Input Leakage Current
IIL
— ±1
*Note: VDD = 2.7 to 3.6 V, –40 to +85 °C unless otherwise specified.
Max
Unit
V
0.6
0.1
V
V
0.6 V
— µA
— pF
— µA
Rev. 1.0
5

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SI3462 arduino
Si3462
4. Si3462-EVB Functional Description
In combination with low-cost external components, the Si3462 controller provides a complete PSE solution for
embedded PoE applications. The Si3462-EVB reference design operates from a +50 V isolated power supply and
delivers power to the powered device.
Refer to the Si3462-EVB User's Guide and schematics for descriptions in the following sections.
The basic sequence of applying power is shown in Figure 3. Following is the description of the function that must
be performed in each phase.
-2.8V
-10V
-15.5V
-20.5V
Ch1: PoE output voltage referenced to the +50V rail
Detection
Classification
-44V
-57V
Power-on
tDET_CYCLE
tCLASS_CYCLE
tPWRUP
Figure 3. Basic Power-up Sequence
Rev. 1.0
11

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