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LTC4274,Co相关技术文章LTC4274-Single IEEE 802.3at Po
LTC4274描述The LTC®4274 is a single Power Sourcing Equipment (PSE) controller designed for use in IEEE 802.3 Type 1 and Type 2 (high power) compliant Power over Ethernet (PoE) systems. The LTC4274 is also a good choice for proprietary PoE PSE systems, which may require more power than the new IEEE 802.3at standard allows. The LTC4274 can source up to 50W while otherwise remaining compatible with IEEE 802.3at. The LTC4274 delivers lowest-in-industry heat dissipation by utilizing a low RON external MOSFET and a 0.25Ω sense resistor, eliminating the need for expensive heat sinks. An external MOSFET also provides a more robust solution compared to an integrated MOSFET. Advanced power management features include: selectable high speed 9.5-bit (1kHz) or high resolution 14.5-bit current and voltage readback, a 7-bit DAC for overcurrent threshold (ICUT), a unique nonlinear 8-bit programmable current limit (ILIM) and versatile quick shutdown. PD Discovery uses a proprietary dualmode 4-point detection mechanism ensuring the best immunity from false PD detection. Midspan PSEs are supported with 2-event classification and a two second backoff timer. Legacy high-capacitance device detection is available. The LTC4274 includes an I2C serial interface operable up to 1MHz. Back to Top
LTC4274特点Compliant with IEEE 802.3at Type 1 and 2 Supports Proprietary Very High Power Up to 50W 0.34Ω Total Channel Resistance 130mW at 600mA Advanced Power Management 8-Bit Programmable Current Limit (ILIM) 7-Bit Programmable Overload Currents (ICUT) Fast Shutdown 14.5-Bit Port Current/Voltage Monitoring 2-Event Classification Very High Reliability 4-Point PD Detection: 2-Point Forced Voltage 2-Point Forced Current High Capacitance Legacy Device Detection LTC4259A-1 and LTC4266 SW Compatible 1MHz I2C Compatible Serial Control Interface Midspan Backoff Timer Available in 38-Pin 5mm × 7mm QFN Package
Typical Application
LTC4274封装QFN-38
LTC4274应用PoE PSE Switches/Routers PoE PSE Midspans
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