PD70201 Controller IC

Microchip's PD70201 is an integrated Powered Device (PD) interface and PWM controller for a DC/DC converter used in IEEE 802.3at Type 2 applications. The PD70201 can be used for IEEE 802.3af and IEEE 802.3at applications. A single PD70201 can be used in 4-pair applications, which consume up to 47.7 W. The device has several features designed to improve efficiency and reliability: detection/classification, capacitor, gate drivers, peak current mode control, maximum duty cycle, soft-start circuit, low voltage protection warning, and monitoring.

Features

• IEEE 802.3at Type 2 compliant
• Support for 4-pair applications of up to 48 W with a single IC
• Two-events classification flag
• Less than 10 µA (typ.) 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