LTC4264 LINER [Linear Technology], LTC4264 Datasheet

LTC4264

Manufacturer Part Number

LTC4264

Description

High Power PD Interface Controller with 750mA Current Limit

Manufacturer

LINER [Linear Technology]

Datasheet

1.LTC4264.pdf (24 pages)

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Download datasheet (309Kb)

FEATURES

APPLICATIONS

■

TYPICAL APPLICATION

SPARE PAIR

–54V FROM

DATA PAIR

Complete High Power PD Interface Controller

IEEE 802.3af

Onboard 750mA Power MOSFET

Complementary Power Good Outputs

Flexible Auxiliary Power Options

Precision Dual Current Limit with Disable

Programmable Classiﬁ cation Current to 75mA

Onboard 25k Signature Resistor with Disable

Undervoltage Lockout

Complete Thermal Overload Protection

Available in Low Proﬁ le (4mm × 3mm) DFN Package

802.11n Access Points

High Power VoIP Video Phones

RFID Reader Systems

PTZ Security Cameras and Surveillance Equipment

DF1501S

–

Compliant

0.1µF

SMAJ58A

CLASS

SHDN

LIM_EN

CLASS

LTC4264

PWRGD

GND

OUT

MIN

5µF

RUN

SWITCHING

SUPPLY

POWER

RTN

DESCRIPTION

The LTC

terface controller intended for IEEE 802.3af Power over

Ethernet (PoE) and high power PoE applications up to 35W.

By including a precision dual current limit, the LTC4264

keeps inrush below the IEEE802.3af current limit levels

to ensure interoperability success while allowing for high

power PD operation. The LTC4264 includes a ﬁ eld-proven

power MOSFET delivering up to 750mA to the PD load while

maintaining compliance with the IEEE802.3af standard.

Complementary power good outputs allow the LTC4264 to

interface directly with a host of DC/DC converter products.

The LTC4264 provides a complete signature and power

interface solution for PD designs by incorporating the 25k

signature resistor, classiﬁ cation circuitry, input current

limit, undervoltage lockout, thermal overload protection,

signature disable and power good signaling.

The LTC4264 PD interface controller can be used along with

a variety of Linear Technology DC/DC converter products

to provide a complete, cost effective power solution for

high power PD applications.

The LTC4264 is available in the space-saving low proﬁ le

(4mm × 3mm) DFN package.

All other trademarks are the property of their respective owners.

, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.

4264 TA01a

High Power PD Interface

TO LOGIC

3.3V

–

4264 is an integrated Powered Device (PD) in-

Controller with 750mA

PWRGD – V

200mA/DIV

50V/DIV

OUT

Current Limit

Turn On vs Time

TIME (5ms/DIV)

LTC4264

LOAD

= 100µF

4264 TA01b

4264f

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