PD70101 Series

IEEE 802.3af Type 1, PD front-end and PWM controller IC w/internal 0.6 Ohm FET

Catalog

IEEE 802.3af Type 1, PD front-end and PWM controller IC w/internal 0.6 Ohm FET

Part	Regulator Topology	Supplied Contents	Frequency - Switching [Max]	Frequency - Switching [Min]	Voltage - Output	Outputs and Type	Outputs and Type	Current - Output	Main Purpose	Board Type	Utilized IC / Part
Microchip Technology PD70101EVB6F	Flyback	Board(s)	500 kHz	100 kHz	5 V	Isolated	1	1.2 A	Power Over Ethernet Special Purpose DC/DC	Fully Populated	PD70101
Microchip Technology PD70101EVB3F	Flyback	Board(s)	500 kHz	100 kHz	3.3 V	Isolated	1	1 A	Power Over Ethernet Special Purpose DC/DC	Fully Populated	PD70101

Catalog

IEEE 802.3af Type 1, PD front-end and PWM controller IC w/internal 0.6 Ohm FET

Key Features

• * 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

Description

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](https://mad.microchip.com/poe).