DESCRIPTION

The LTC?9111 is an IEEE 802.3cg compliant Single-Pair

Power over Ethernet (SPoE) Powered Device (PD) controller.

A wide 2.3V to 60V operating range capability with

polarity correction make the LTC9111 particularly well

suited for classification-based systems in building and

factory automation.

SCCP-based classification ensures full operating voltage

is applied by the Power Sourcing Equipment (PSE) only

when a valid PD is connected. The LTC9111 drives two

external N-channel MOSFET switches during classification

with micropower operation to minimize reservoir capacitor

requirements. An external N-channel MOSFET switch

isolates the output capacitance from the connector during

classification and inrush. A voltage supervisor enables the

external MOSFET when the PD input voltage exceeds the

ON voltage threshold for the configured class and after a

mandated delay. The EN output asserts after the controlled

GATE pin ramp-up. The MOSFET is disabled if the input

voltage drops below the OFF voltage threshold for the

configured class. The LTC9111 drives a pair of external

low-side N-channel MOSFETs with a low start-up voltage

of 1.6V for polarity correction with reduced power losses.

FEATURES

- IEEE 802.3cg Compliant

- Wide Input Voltage Range: 2.3V to 60V

- Supports Serial Communication Classification Protocol (SCCP)

- Wakeup Signature

- Integrated 3.5V Standby Regulator

- 150μA Maximum Current During Classification

- Drives Low-Side Bridge MOSFETs for Polarity Correction

- Charge Pump Enhances External N-Channel MOSFET

- Pin Programmable Class Configuration

- Available in 12-Pin MSOP and DFN 4mm × 3mm Packages

APPLICATIONS

- Building Automation

- Factory Automation

- Security Systems

- Traffic Control Systems