LTC9111

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

Industrial SPoE PD Controller

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

Power over Ethernet (SPoE) Powered Device (PD) con-

troller. 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 capaci-

tor 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.

APPLICATIONS

n

IEEE 802.3cg Compliant

n

Wide Input Voltage Range: 2.3V to 60V

n

Supports Serial Communication Classification

Protocol (SCCP)

n

Wakeup Signature

n

Integrated 3.5V Standby Regulator

n

150µA Maximum Current During Classification

n

Drives Low-Side Bridge MOSFETs for Polarity Correction

n

Charge Pump Enhances External N-Channel MOSFET

n

Pin Programmable Class Configuration

n

Available in 12-Pin MSOP and DFN

4mm × 3mm Packages

n

Building Automation

n

Factory Automation

n

Security Systems

n

Traffic Control Systems

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47nF

150nF

2.2µF

STBY

SNS1

SNS2

IN

GND

GATE

EN

CLASSC

CLASSV

ADIN1100

LTC9111

OUT

LGATE1

LGATE2

SCCP

DC/DC

CONVERTER

EN

GND

IN

FROM PSE

VREG

9111 TA01

BSS123

BSS123