Data Sheet

LTC9101-2B/LTC9102

24-/48-Port IEEE 802.3bt PoE PSE Controller

Rev. 0

DOCUMENT FEEDBACK

TECHNICAL SUPPORT

Information furnished by Analog Devices is believed to be accurate and reliable "as is". However, no responsibility is assumed by Analog

Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to

change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and

registered trademarks are the property of their respective owners.

FEATURES

►

Fully Compliant IEEE 802.3bt Type 3 2-Pair PSE

►

Up to 48 PSE Ports with One Power Channel per Port

►

+80V/–20V Tolerant Port-Facing Pins

►

ECC-Protected eFlash and Data RAMs

►

Industry-Leading Power Path Efficiency

►

100mΩ Sense Resistance

►

30mΩ or Lower MOSFET RDS(ON)

►

Chipset Provides Electrical Isolation

►

Eliminates Optos and Isolated 3.3V Supply

►

Very High Reliability Multipoint PD Detection

►

Continuous Voltage, Temperature, and Current Monitoring

►

1MHz I2C Compatible Serial Control Interface

►

Pin or I2C Programmable PD Power

►

Available in a 24-Lead 4mm × 4mm (LTC9101-2B) and 64-Lead

7mm × 11mm (LTC9102) QFN Packages

APPLICATIONS

►

PoE PSE Switches/Routers and Midspans

DESCRIPTION

The LTC

®9101-2B/LTC9102 chipset is a 12-/24-/48-port power

sourcing equipment (PSE) controller designed for use in IEEE

802.3bt-compliant Type 3 2-pair Power over Ethernet (PoE) sys-

tems. The LTC9101-2B/LTC9102 is designed to power compliant

802.3af, 802.3at, and 802.3bt PDs. The LTC9101-2B/LTC9102

chipset delivers lowest-in-industry heat dissipation by utilizing low

RDS(ON) external MOSFETs and 0.1Ω sense resistance per power

channel. A transformer-isolated communication protocol replaces

expensive opto-couplers and a complex isolated 3.3V supply, re-

sulting in significant BOM cost savings.

Advanced power management features include per-port 14‑bit cur-

rent/voltage monitoring, programmable power limits, and versatile

fast shut down of preselected ports. PD detection uses a propriet-

ary multipoint detection mechanism ensuring excellent immunity

from false PD identification. Autoclass and 2-event physical classifi-

cation are supported. The LTC9101-2B/LTC9102 includes an I2C

serial interface operable up to 1MHz. The LTC9101-2B/LTC9102

is pin or I2C programmable to negotiate PD delivered power up to

25.5W.

TYPICAL APPLICATION

Figure 1. 802.3bt 2-Pair Application, 1 Port Shown

Analog Devices, Inc., is in the process of updating documentation to provide terminology and language that is culturally appropriate, which is a

process with a wide scope and will be phased in as quickly as possible. Thank you for your patience.