LT4293

1

Rev. 0

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TYPICAL APPLICATION

FEATURES

DESCRIPTION

LTPoE++/IEEE 802.3bt

PD Interface Controller

The LT®4293 is an LTPoE++/IEEE 802.3af/at/bt-compliant

powered device (PD) interface controller. The T2P output

distinguishes between LTPoE++ and IEEE 802.3bt power

sourcing equipment (PSE) during mutual identification

and negotiation of available power.

hot swap MOSFET and supports the LT4320/LT4321 ideal

bridges, to extend the end-to-end power delivery effi-

ciency and eliminate costly heat sinks. The LT4293 also

includes a power good output, onboard signature resistor,

undervoltage lockout, and thermal protection. Start-up

inrush current is adjustable with an external capacitor.

Auxiliary power override is supported as low as 9V with

the AUX pin.

The LT4293 can be configured to support all possible

LTPoE++, 802.3bt, 802.3at and 802.3af power levels

with external component changes. Pin-for-pin compat-

ibility with the LT4275 and LT4294 family of PD Interface

Controllers enables easy migration between LTPoE++ PDs

and IEEE 802.3bt-compliant PDs.

LTPoE++/IEEE 802.3bt Single-Signature Powered Device Interface

APPLICATIONS

n

Controller

n

Supports Up to 90W PDs

n

Distinguishes Between LTPoE++ and IEEE 802.3bt PSEs

n

5-Event Classification Sensing

n

Superior Surge Protection (100V Absolute Maximum)

n

Wide Junction Temperature Range

(–40°C to 125°C)

n

Overtemperature Protection

n

Integrated Signature Resistor

n

External Hot Swap N-Channel MOSFET for Lowest

Power Dissipation and Highest System Efficiency

n

Configurable Aux Power Support as Low as 9V

n

Pin Compatible with LT4275A/B/C and LT4294

n

Available in 10-Lead MSOP and 3mm × 3mm

DFN Packages

n

High Power Wireless Data Systems

n

Outdoor Security Camera Equipment

n

Commercial and Public Information Displays

n

High Temperature Industrial Applications

CLASS

SINGLE-SIGNATURE

POWER CLASSIFICATION

(AT PD INPUT)

LTPoE++

IEEE 802.3bt

0

13W

13W

1

3.84W

3.84W

2

6.49W

6.49W

3

13W

13W

4

25.5W

25.5W

5

38.7W

40W

6

52.7W

51W

7

70W

62W

8

90W

71.3W

LT4293

VPORT HSGATE

GND

4293 TA01a

HSSRC

AUX

RCLASS

RCLASS++

PWRGD

T2P

0.1µF

DATA

PAIR

SPARE

PAIR

RUN

47nF

3.3k

PSMN040-100MSE

+

–

ISOLATED

POWER

SUPPLY

OPTO

PSE TYPE

(TO µP)

+

–

~

~

+

–

~

~

+

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