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SI3402-B Dataheets PDF



Part Number SI3402-B
Manufacturers Silicon Laboratories
Logo Silicon Laboratories
Description FULLY-INTEGRATED 802.3-COMPLIANT POE PD INTERFACE AND LOW-EMI SWITCHING REGULATOR
Datasheet SI3402-B DatasheetSI3402-B Datasheet (PDF)

Si3402-B FULLY-INTEGRATED 802.3-COMPLIANT POE PD INTERFACE AND LOW-EMI SWITCHING REGULATOR Features  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 .

  SI3402-B   SI3402-B


Document
Si3402-B FULLY-INTEGRATED 802.3-COMPLIANT POE PD INTERFACE AND LOW-EMI SWITCHING REGULATOR Features  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 EMIreduction 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 Applications  Voice over IP telephones and adapters  Wireless access points  Security cameras Description  Point-of-sale terminals  Internet appliances  Network devices  High power applications 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 nonisolated (buck) converter topologies. The Si3402 supports IEEE 802.3at Type 1 Powered Device applications. 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. The Si3402 is designed for IEEE 802.3at Type 1 (Class 3 and below) applications. 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. Ordering Information: See page 18. Pin Assignments 5 x 5 mm QFN (Top View) FB VSS2 SWO VSS1 VPOSS VSSA 20 19 18 17 16 15 EROUT 1 SSFT* 2 VDD 3 ISOSSFT* 4 VNEG (PAD) 14 CT1 13 CT2 12 VPOSF 11 SP1 5 6 7 8 9 10 PLOSS RDET HSO RCL VNEG SP2 Note: Original pin names shown for compatibility reasons, but SSFT, ISOSSFT, VPOSS, and VSS1 are not internally connected. Rev. 1.0 11/15 Copyright © 2015 by Silicon Laboratories Si3402-B Si3402-B Functional Block Diagram VPOSF VPOSS* RDET RCL SSFT* VDD IS O S S FT * CT1 CT2 SP1 SP2 Rectification & Protection D ete ctio n & C lassificatio n H otsw ap S w itch & C u rre nt lim it H otsw ap C ontrol & Com m on B ias P W M C ontrol and EMI L im itin g S w itching FET EROUT FB SW O VNEG HSO PLOSS VSSA VSS1* VSS2 N o te : O rig in a l p in n a m e s s h o w n fo r c o m p a tib ility re a s o n s, b u t S S F T , IS O S S F T , V P O S S , a n d V S S 1 a re n o t in te rn a lly co n n e cte d. 2 Rev. 1.0 TABLE OF CONTENTS Si3402-B Section Page 1. Electrical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4 2. Typical Application Schematics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8 3. Functional Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.1. Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.2. PD Hotswap Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 3.3. Switching Regulator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 4. Pin Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 5. Package Outline . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 6. Recommended Land Pattern . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 7. Ordering Guide . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 8. Device Marking Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .


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