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LTC4264IDE Folha de dados(PDF) 1 Page - Linear Technology |
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LTC4264IDE Folha de dados(HTML) 1 Page - Linear Technology |
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1 / 24 page  LTC4264 1 4264f TYPICAL APPLICATION FEATURES APPLICATIONS DESCRIPTION High Power PD Interface Controller with 750mA Current Limit The LTC ®4264 is an integrated Powered Device (PD) in- terface controller intended for IEEE 802.3af Power over Ethernet (PoE) and high power PoE applications up to 35W. By including a precision dual current limit, the LTC4264 keeps inrush below the IEEE802.3af current limit levels to ensure interoperability success while allowing for high power PD operation. The LTC4264 includes a field-proven power MOSFET delivering up to 750mA to the PD load while maintaining compliance with the IEEE802.3af standard. Complementary power good outputs allow the LTC4264 to interface directly with a host of DC/DC converter products. The LTC4264 provides a complete signature and power interface solution for PD designs by incorporating the 25k signature resistor, classification circuitry, input current limit, undervoltage lockout, thermal overload protection, signature disable and power good signaling. The LTC4264 PD interface controller can be used along with a variety of Linear Technology DC/DC converter products to provide a complete, cost effective power solution for high power PD applications. The LTC4264 is available in the space-saving low profile (4mm × 3mm) DFN package. ■ Complete High Power PD Interface Controller ■ IEEE 802.3af ® Compliant ■ Onboard 750mA Power MOSFET ■ Complementary Power Good Outputs ■ Flexible Auxiliary Power Options ■ Precision Dual Current Limit with Disable ■ Programmable Classification Current to 75mA ■ Onboard 25k Signature Resistor with Disable ■ Undervoltage Lockout ■ Complete Thermal Overload Protection ■ Available in Low Profile (4mm × 3mm) DFN Package ■ 802.11n Access Points ■ High Power VoIP Video Phones ■ RFID Reader Systems ■ PTZ Security Cameras and Surveillance Equipment , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. GND RCLASS ILIM_EN SHDN RCLASS SMAJ58A –54V FROM DATA PAIR –54V FROM SPARE PAIR 0.1 µF PWRGD PWRGD LTC4264 VIN RUN 5 µF MIN 3.3V TO LOGIC RTN SWITCHING POWER SUPPLY VIN VOUT 4264 TA01a + – + ~ ~ + – ~ ~ + – DF1501S DF1501S VIN 50V/DIV VOUT 50V/DIV PWRGD – VOUT 50V/DIV IIN 200mA/DIV TIME (5ms/DIV) 4264 TA01b CLOAD = 100µF Turn On vs Time |
Nº de peça semelhante - LTC4264IDE |
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Descrição semelhante - LTC4264IDE |
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