SI3402-EVB Silicon Laboratories Inc, SI3402-EVB Datasheet

SI3402-EVB

Manufacturer Part Number

SI3402-EVB

Description

BOARD EVAL POE FOR SI3402

Manufacturer

Silicon Laboratories Inc

Type

PWM Controllersr

Datasheet

1.SI3402-EVB.pdf (22 pages)

Specifications of SI3402-EVB

Main Purpose

Special Purpose DC/DC, Power Over Ethernet

Outputs And Type

1, Non-Isolated

Voltage - Output

Voltage - Input

44 ~ 57V

Regulator Topology

Buck

Frequency - Switching

350kHz

Board Type

Fully Populated

Utilized Ic / Part

Si3402

Input Voltage

5 V

Output Voltage

3.3 V

Interface Type

Ethernet

Maximum Operating Temperature

+ 85 C

Minimum Operating Temperature

- 40 C

Product

Power Management Modules

For Use With/related Products

Si3402

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

Current - Output

Power - Output

Lead Free Status / Rohs Status

Lead free / RoHS Compliant

Other names

336-1827

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AND

Features



Applications



Description

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 Std 802.3™ 2008 including

the IEEE Std 802.3at-2009 amendment for the case of single-event

classification. Standard external resistors connected to the Si3402 provide

the proper 802.3 signatures for the detection function and programming of

the classification mode. 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. While the

Si3402 is designed for applications up to 10 W, it can be used for higher

power applications (up to approximately 15 W). See also “AN313: Using the

Si3402 in High Power Applications” for more information.

Rev. 1.2 1/12

U LL Y

IEEE 802.3 standard-compliant

solution, including pre-standard

(legacy) PoE support

Highly-integrated IC enables

compact solution footprints



Programmable classification

circuit

Voice over IP telephones and

adapters

Wireless access points

Security cameras

transient surge suppressor

controller with on-chip power

FET

hotswap switch

Minimal external components

Integrated diode bridges and

Integrated switching regulator

Integrated dual current-limited

O W

IN TE GRA TE D

- E M I S

W I TCH IN G

8 0 2 . 3 -



Point-of-sale terminals

Internet appliances

Network devices

High power applications

Incorporates switcher EMI-

reduction techniques.

Supports non-isolated and

isolated switching topologies

Comprehensive protection

circuitry



Low-profile 5 x 5 mm 20-pin QFN

RoHS-compliant

protection

Transient overvoltage

Undervoltage lockout

Early power-loss indicator

Thermal shutdown protection

Foldback current limiting

C O M P L I A N T

EGU LA TO R

E P D I

ISOSSFT

EROUT

SSFT

VDD

Ordering Information:

Pin Assignments

N T E R F A C E

See page 19.

5 x 5 mm QFN

(Top View)

Si3402

VNEG

(PAD)

CT2

CT1

VPOSF

SP1

Si3402

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