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STHS4257L1 Dataheets PDF



Part Number STHS4257L1
Manufacturers STMicroelectronics
Logo STMicroelectronics
Description IEEE 802.3af PoE Powered Device (PD) interface controller
Datasheet STHS4257L1 DatasheetSTHS4257L1 Datasheet (PDF)

STHS4257A, STHS4257A1 STHS4257L, STHS4257L1 IEEE 802.3af PoE Powered Device (PD) interface controller with integrated signature resistor www.datasheet4u.com Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ IEEE 802.3af-compliant interface for Powered Devices (PDs) Integrated 100V, 450mA power MOSFET low side switch Inrush current limit Normal operation current limit Integrated 25kΩ signature resistor Signature disable (STHS4257A1/L1) Resistor-programmable classification current (Class 0-4) Power Good outp.

  STHS4257L1   STHS4257L1


Document
STHS4257A, STHS4257A1 STHS4257L, STHS4257L1 IEEE 802.3af PoE Powered Device (PD) interface controller with integrated signature resistor www.datasheet4u.com Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ IEEE 802.3af-compliant interface for Powered Devices (PDs) Integrated 100V, 450mA power MOSFET low side switch Inrush current limit Normal operation current limit Integrated 25kΩ signature resistor Signature disable (STHS4257A1/L1) Resistor-programmable classification current (Class 0-4) Power Good output, open drain Undervoltage Lockout (UVLO) Thermal overload protection (two-step for the STHS4257A/L) Latch (L) or auto-retry (A) after repetitive thermal overload Industrial temperature range: –40 to +85°C SO8 and DFN8 (3mm x 3mm) packages RoHS compliant 8 1 SO8 (M) DFN8 3mm x 3mm (DB) Applications ■ ■ ■ Voice over IP (VoIP) phones Table 1. Device options Signature disable Order code s b O STHS4257A t e ol o r eP ✔ ) s t( c du 39.2 36.0 39.2 30.5 30.5 30.5 30.5 -O ■ ■ ■ l o bs Web cameras WLAN access points Internet appliances POS terminals RFID readers P e et c u d o r ) s t( UVLO threshold, rising (V) UVLO threshold, falling (V) Protection mode Thermal overload protection 2 steps 1 step 2 steps 1 step Inrush current limit (mA, typ) Normal operation current limit (mA, typ) Auto Auto Latch Latch 350/188 (1) 140 350/188 (1) 140 375 375 STHS4257A1 STHS4257L STHS4257L1 ✔ 36.0 1. Current limit is common for both modes and gets reduced only in case of thermal overload. See Table 5: Electrical parameters. July 2007 Rev 4 1/18 www.st.com 1 Contents STHS4257A, STHS4257A1, STHS4257L, STHS4257L1 Contents 1 www.datasheet4u.com Summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1.1 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.1.1 1.1.2 1.1.3 1.1.4 1.1.5 1.1.6 Classification (RCLASS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Power supply (GND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Signature disable input (SIGDISA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Power Good output (PWRGD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Negative power output (VOUT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 1.2 IEEE802.3af PD power classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 2 3 4 5 6 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 s b O c u d o Package mechanical data . . . . . . . . . . . . . . . . . . . . . . .r . . . . . . . . . . . . . 14 P Part numbering . . . . . . . . . . . . . . . . . . . . . . . .t .e . . . . . . . . . . . . . . . . . . . 16 e l o Revision history . . . . . . . . . . . . . .b . .s . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 O ) s t( c u d o r P e t e ol Electrical parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 ) s t( 2/18 STHS4257A, STHS4257A1, STHS4257L, STHS4257L1 List of tables List of tables Table 1. Table 2. Table 3. www.datasheet4u.com Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Device options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 IEEE802.3af PD power classes and corresponding RCLASS values. . . . . . . . . . . . . . . . . . . 7 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Electrical parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 SO8 – 8-lead plastic small outline, 150mils width, mechanical data. . . . . . . . . . . . . . . . . . 14 DFN8 – 8-lead dual flat no-lead outline, package mechanical data . . . . . . . . . . . . . . . . . . 15 Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 s b O t e ol o r eP s ( t c u d O ) l o bs P e et c u d o r ) s t( 3/18 List of figures STHS4257A, STHS4257A1, STHS4257L, STHS4257L1 List of figures Figure 1. Figure 2. Figure 3. www.datasheet4u.com Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Figure 9. Figure 10. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Pin connections (STHS4257A/L, top view) . . . . . . . . . . . . . . . . . . . . . . . . .


STHS4257L STHS4257L1 NAS623


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