LTC4267CGN3PBF Linear Technology Corporation, LTC4267CGN3PBF Datasheet

LTC4267CGN3PBF

Manufacturer Part Number

LTC4267CGN3PBF

Description

SSOP16

Manufacturer

Linear Technology Corporation

Datasheet

1.LTC4267CGN3PBF.pdf (32 pages)

Specifications of LTC4267CGN3PBF

Date_code

07+

Current page: 1 of 32
Download datasheet (711Kb)

FEATURES

APPLICATIO S

All other trademarks are the property of their respective owners.

TYPICAL APPLICATIO

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

IP Phone Power Management

Wireless Access Points

Security Cameras

Power over Ethernet

Complete Power Interface Port for IEEE 802

Powered Device (PD)

Onboard 100V, UVLO Switch

Constant-Frequency 300kHz Operation

Precision Dual Level Inrush Current Limit

Integrated Current Mode Switching Regulator

Onboard 25k Signature Resistor with Disable

Programmable Classiﬁ cation Current (Class 0-4)

Thermal Overload Protection

Power Good Signal

Integrated Error Ampliﬁ er and Voltage Reference

Low Proﬁ le 16-Pin SSOP or DFN Packages

SPARE PAIR

DATA PAIR

FROM

–48V

HD01

–

0.1µF

Class 2 PD with 3.3V Isolated Power Supply

SMAJ58A

68.1Ω

CLASS

SIGDISA

.3af

PORTP

PORTN

CLASS

Integrated Switching Regulator

LTC4267-3

IEEE 802.3af PD Interface with

PWRGD

NGATE

SENSE

PGND

/RUN

VCC

OUT

DESCRIPTIO

The LTC

Powered Device (PD) interface with a 300kHz current mode

switching regulator, providing a complete power solution

for PD applications. The LTC4267-3 integrates the 25k

signature resistor, classiﬁ cation current source, thermal

overload protection, signature disable and power good

signal along with an undervoltage lockout optimized for

use with the IEEE-required diode bridge. The LTC4267-3

provides an increased operational current limit, maximizing

power available for class 3 applications.

The 300kHz current mode switching regulator provides

higher output power or smaller external size compared

to its lower frequency counterparts. The LTC4267-3 is

designed for driving a 6V rated N-channel MOSFET and

features programmable slope compensation, soft-start,

and constant-frequency operation, minimizing noise even

with light loads. The LTC4267-3 includes an onboard er-

ror ampliﬁ er and voltage reference allowing use in both

isolated and nonisolated conﬁ gurations.

The LTC4267-3 is available in a space saving, low proﬁ le

16-pin SSOP or DFN packages.

BAS516

10k

4.7µF

4267-3 combines an IEEE 802.3af compliant

10k

VCC

6.8k

Power over Ethernet

Si3440

5µF

MIN

0.1Ω

PS2911

•

PA1133

•

TLV431

SBM1040

320µF

MIN

470Ω

LTC4267-3

22nF

100k

60.4k

CHASSIS

42671 TA01

3.3V

1.5A

42673f

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