• IEEE 802.3at Type 2 compliant
• Support for 4-pair applications of up to 48W with a single IC
• Two-events classification flag
• Less Than 10 µA (typical) offset current during detection
• Signature resistor is disconnected upon detection
• Programmable classification setting with a single resistor
• Integrated 0.6 Ohm isolating MOSFET switch with inrush current limit
• Power off DC-DC input capacitor discharge
• 100 kHz to 500 kHz adjustable DC-DC switching frequency
• DC-DC frequency can be synchronized to external clock
• Supports low power mode operation for higher efficiency
• Up to 50% duty cycle
• Soft-start circuit to control the output voltage rise time
• Two out-of-phase driver stages for efficient synchronous rectification or active clamp
• PoE port input UVLO with programmable threshold and hysteresis
• Internal differential amplifier simplifying non-isolated step down converter

The PD70201 is an integrated Powered Device (PD) Interface and PWM controllers for a DC-DC converter used in IEEE 802.3at Type 2 applications. The PD70201 can be used for IEEE 802.3af, IEEE 802.3at applications. A single PD70201 can be used in 4-pair applications which consumes up to 47.7W. The device has several features designed to improve efficiency and reliability:

• Detection and classification

• Capacitor

• Gate drivers

• Peak current mode control

• Maximum duty cycle

• Soft-start circuit

• Low voltage protection warning and monitoring

Start your PoE PD power supply design using Microchip MPLAB^® Analog Designer.