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LTC4267IDHC Datasheet(PDF) 1 Page - Linear Technology |
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LTC4267IDHC Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LTC4267 1 4267fc Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator The LTC ®4267 combines an IEEE 802.3af compliant Pow- ered Device (PD) interface with a current mode switching regulator, providing a complete power solution for PD applications. The LTC4267 integrates the 25kΩ signature resistor, classification current source, thermal overload pro- tection, signature disable and power good signal along with an undervoltage lockout optimized for use with the IEEE- required diode bridge. The precision dual level input current limit allows the LTC4267 to charge large load capacitors and interface with legacy PoE systems. The current mode switching regulator is designed for driving a 6V rated N-channel MOSFET and features pro- grammable slope compensation, soft-start, and constant frequency operation, minimizing noise even with light loads. The LTC4267 includes an onboard error amplifier and voltage reference allowing use in both isolated and nonisolated configurations. The LTC4267 is available in space saving, low profile 16-pin SSOP or DFN packages. ■ IP Phone Power Management ■ Wireless Access Points ■ Security Cameras ■ Power over Ethernet ■ Complete Power Interface Port for IEEE 802 ®.3af Powered Device (PD) ■ Onboard 100V, 400mA UVLO Switch ■ Precision Dual Level Inrush Current Limit ■ Integrated Current Mode Switching Regulator ■ Onboard 25kΩ Signature Resistor with Disable ■ Programmable Classification Current (Class 0-4) ■ Thermal Overload Protection ■ Power Good Signal ■ Integrated Error Amplifier and Voltage Reference ■ Low Profile 16-Pin SSOP and 3mm × 5mm DFN Packages FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO Class 2 PD with 3.3V Isolated Power Supply PVCC PWRGD NGATE SENSE ITH/RUN VFB PGND POUT VPORTP RCLASS SIGDISA VPORTN LTC4267 + + RCLASS 68.1 Ω 1% 5µF MIN 10k 470 100k 60.4k PVCC PVCC 4.7µF 320µF MIN 22nF • • PA1133 PS2911 BAS516 TLV431 SBM1040 SMAJ58A 3.3V 1.5A CHASSIS HD01 + – + – HD01 –48V FROM DATA PAIR –48V FROM SPARE PAIR 4267 TA01 Si3440 0.1 Ω 6.8k 10k 0.1µF , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. |
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