LM5070

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LM5070 Features

• Fully Compliant 802.3af Power Interface Port
• 80V, 1, 400 mA Internal MOSFET
• Programmable Inrush Current Limit
• Detection Resistor Disconnect Function
• Programmable Classification Current
• Programmable Under-voltage Lockout with Programmable Hysteresis
• Thermal Shutdown Protection
• Current Mode Pulse Width Modulator
• Supports both Isolated and Non-Isolated Applications
• Error Amplifier and Reference for Non-Isolated Applications
• Programmable Oscillator Frequency
• Programmable Soft-start
• 80% Maximum Duty Cycle Limiter, Slope Compensation (-80 device)
• 50% Maximum Duty Cycle Limiter, No Slope Compensation (-50 device)
• 800 mA Peak Gate Driver

LM5070 Description

The LM5070 power interface port and pulse width modulation (PWM) controller provides a complete integrated solution for Powered Devices (PD) that connect into Power over Ethernet (PoE) systems. The LM5070 integrates an 80V, 400mA line connection switch and associated control for a fully IEEE 802.3af compliant interface with a full featured current mode pulse width modulator dc-dc converter. All power sequencing requirements between the controller interface and switch mode power supply (SMPS) are integrated into the IC. Two options are available providing either an 80% maximum duty cycle limit with slope compensation (on the -80 suffix) device or a 50% maximum duty cycle limit and no slope compensation on the (-50 suffix) device.

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