• IEEE 802.3af Type 1 compliant
• 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
• Over load and short circuit protection
• 32-pin, 5mm × 5mm QFN
• MSL3, RoHS compliant

The PD70101 is an integrated Powered Device (PD) Interface and PWM controllers for a DC-DC converter used in IEEE 802.3af applications. The PD70101 can be used for IEEE 802.3af Type 1 applications. The device has several features designed to improve efficiency and reliability:

• 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.