LTC4263CS#TRPBF Linear Technology, LTC4263CS#TRPBF Datasheet

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LTC4263CS#TRPBF

Manufacturer Part Number
LTC4263CS#TRPBF
Description
IC IEEE 803.2AF CNTRLR 14-SOIC
Manufacturer
Linear Technology
Type
Power Over Ethernet (PoE)r
Datasheet

Specifications of LTC4263CS#TRPBF

Applications
Power Interface Switch for Power Over Ethernet (PoE) Devices
Voltage - Supply
48V
Operating Temperature
0°C ~ 70°C
Mounting Type
Surface Mount
Package / Case
14-SOIC (3.9mm Width), 14-SOL
Current - Supply
1mA
Interface
IEEE 802.3af
Controller Type
Power Sourcing Equipment Controller (PSE)
Lead Free Status / RoHS Status
Lead free / RoHS Compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Company:
Part Number:
LTC4263CS#TRPBFLTC4263CS
Manufacturer:
LINEAR/凌特
Quantity:
20 000
Company:
Part Number:
LTC4263CS#TRPBFLTC4263CS#PBF
Manufacturer:
TAIYO
Quantity:
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Company:
Part Number:
LTC4263CS#TRPBFLTC4263CS#PBF
Manufacturer:
LINEAR/凌特
Quantity:
20 000
FEATURES
APPLICATIONS
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L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of
Linear Technology Corporation. Hot Swap and ThinSOT are trademarks of Linear Technology
Corporation. All other trademarks are the property of their respective owners.
TYPICAL APPLICATION
IEEE 802
Operation from a Single 48V Supply
Fully Autonomous Operation without
Microcontroller
Internal MOSFET with Thermal Protection
Power Management Works Across Multiple Ports
with Simple RC Network
Precision Inrush Control with Internal Sense Resistor
Powered Device (PD) Detection and Classifi cation
AC and DC Disconnect Sensing
Robust Short-Circuit Protection
Pin-Selectable Detection Backoff for Midspan PSEs
Classifi cation Dependent I
LED Driver Indicates Port On and Blinks
Status Codes
Available in 14-Pin SO and 4mm × 3mm DFN Packages
IEEE 802.3af Compliant Endpoint/Midspan PSEs
Single-Port or Multi-Port Power Injectors
Power Forwarders
Low-Port Count PSEs
Environment B PSEs
Standalone PSEs
®
.3af Compliant
48V SUPPLY
ISOLATED
+
CUT
Current Threshold
0.1μF
100V
Single-Port Fully Autonomous PSE
0.1μF
LED
LEGACY
MIDSPAN
PWRMGT
V
V
OSC
SS
SS
LTC4263
DESCRIPTION
The LTC
controller for use in IEEE 802.3af compliant Power over
Ethernet systems. It includes an onboard power MOSFET,
internal inrush, current limit, and short-circuit control,
IEEE 802.3af compliant PD detection and classifi cation
circuitry, and selectable AC or DC disconnect sensing.
Onboard control algorithms provide complete IEEE 802.3af
compliant operation without the need of a microcontroller.
The LTC4263 simplifi es PSE implementation, needing
only a single 48V supply and a small number of passive
support components.
Programmable onboard power management circuitry
permits multiple LTC4263s to allocate and share power
in multi-port systems, allowing maximum utilization of
the 48V power supply—all without the intervention of a
host processor. The port current limit can be confi gured
to automatically adjust to the detected PD class. Detec-
tion backoff timing is confi gurable for either Endpoint or
Midspan operation. Built-in foldback and thermal protection
provide comprehensive fault protection.
An LED pin indicates the state of the port controlled by
the LTC4263. When run from a single 48V supply, the LED
pin can operate as a simple switching current source to
reduce power dissipation in the LED drive circuitry.
The LTC4263 is available in 14-pin 4mm × 3mm DFN and
14-pin SO packages.
ENFCLS
ACOUT
V
V
DD48
OUT
OUT
Compliant PSE Controller
DD5
SD
®
4263 is an autonomous single-channel PSE
SMAJ58A
with Internal Switch
1A
Single IEEE 802.3af
0.1μF
100V
MAGNETICS
4263 TA01
TO PORT
LTC4263
4263fe
1

Related parts for LTC4263CS#TRPBF

LTC4263CS#TRPBF Summary of contents

Page 1

... Low-Port Count PSEs n Environment B PSEs n Standalone PSEs L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. Hot Swap and ThinSOT are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION + ...

Page 2

... LTC4263CDE#PBF LTC4263CDE#TRPBF LTC4263IDE#PBF LTC4263IDE#TRPBF LTC4263CS#PBF LTC4263CS#TRPBF LTC4263IS#PBF LTC4263IS#TRPBF Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi label on the shipping container. For more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to: ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi ...

Page 3

ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T relative to V unless otherwise noted. (Notes SYMBOL PARAMETER V OVLO Turn-Off Voltage OVLO_OFF V OVLO Hysteresis OVLO_HYS V V Supply Voltage DD5 DD5 V Internal Supply ...

Page 4

LTC4263 ELECTRICAL CHARACTERISTICS temperature range, otherwise specifi cations are at T relative to V unless otherwise noted. (Notes SYMBOL PARAMETER A Voltage Gain OSC to ACOUT VACD I AC Disconnect Output Current ACDMAX I Remain Connected AC ...

Page 5

TYPICAL PERFORMANCE CHARACTERISTICS Powering an IEEE 802.3af PD V DD48 POWER ON DETECTION DETECTION V PHASE 1 PHASE 2 OUT 10V/DIV CLASSIFICATION V SS 4263 G01 100ms/DIV Overload Restart Delay V DD48 OUT 10V/DIV ...

Page 6

LTC4263 TYPICAL PERFORMANCE CHARACTERISTICS Current Limit and Foldback 450 400 350 300 250 200 150 100 – V DD48 OUT 4263 G03 I DC Supply Current vs ...

Page 7

TEST TIMING Detect, Class and Turn-On Timing PD INSERTED V DD48 t DET V OUT V CLASS t t DETDLY DC Disconnect Timing I I OUT MIN V DD48 V OUT MPS PORT TURN-ON t PDC PON ...

Page 8

LTC4263 PIN FUNCTIONS (DFN/SO) LED (Pin 1): Port State LED Drive. This pin is an open drain output that pulls down when the port is powered. Under port fault conditions, the LED will fl ash in patterns to indicate the ...

Page 9

BLOCK DIAGRAM 14 V DD5 R LED + 1 LED 48V – TO OTHER LTC4263s 4 PWRMGT + 5V – 0.1μF 7 OSC BOLD LINES INDICATE HIGH CURRENT V DD48 11 5V ...

Page 10

LTC4263 APPLICATIONS INFORMATION POE OVERVIEW Over the years, twisted-pair Ethernet has become the most commonly used method for local area networking. The IEEE 802.3 group, the originator of the Ethernet standard, has defi ned an extension to the standard, IEEE ...

Page 11

APPLICATIONS INFORMATION LTC4263 OPERATION Signature Detection The IEEE 802.3af specifi cation defi nes a specifi c pair-to- pair signature resistance used to identify a device that can accept power via its Ethernet connection. When the port voltage is below 10V, ...

Page 12

LTC4263 APPLICATIONS INFORMATION Classifi cation An IEEE 802.3af PD has the option of presenting a classifi cation signature to the PSE to indicate how much power it will draw when operating. This signature consists of a specifi c constant-current draw ...

Page 13

APPLICATIONS INFORMATION Power Management The LTC4263 includes a power management feature allowing simple implementation of power management across multiple ports driven by a single power supply. The PWRMGT pins of all LTC4263 devices are tied together along with an RC ...

Page 14

LTC4263 APPLICATIONS INFORMATION Power Control The primary function of the LTC4263 is to control the delivery of power to the PSE port. In order to meet IEEE 802.3af requirements and provide a robust solution, a variety of current limit and ...

Page 15

APPLICATIONS INFORMATION condition is removed before the t OVLD port stays powered and the timer is reset. Foldback Foldback is designed to limit power dissipation in the LTC4263 during power-up and momentary short-circuit conditions. At low port output voltages, the ...

Page 16

... Power over Ethernet AC disconnect system (PSE, transformers, cabling, PD, etc.) is complex; deviating from the recommended values DET DET discouraged. Contact the Linear Technology Applications department for additional support. Internal 110Hz AC Oscillator The LTC4263 includes onboard circuitry to generate a 110Hz (typ), 2V sine wave on its OSC pin when a P-P 0.1μ ...

Page 17

... LTC4263 in a PSE does not in itself guarantee IEEE 802.3af compliance. To ensure a compliant PSE design recommended to adhere closely to the example ap- 4263 F09 plication circuits provided. For further assistance contact the Linear Technology Applications department. LED FLASH CODE Off Off On 1 Flash ...

Page 18

LTC4263 APPLICATIONS INFORMATION Common Mode Chokes Both non-powered and powered Ethernet connections achieve best performance for data transfer and EMI when a common mode choke is used on each port. For cost reduction reasons, some designs share a common mode ...

Page 19

APPLICATIONS INFORMATION Fuse While the LTC4263 does not require a fuse for proper operation or for compliance with IEEE 802.3af, some safety requirements state that the output current must be limited to less than 2A in less than 60 seconds ...

Page 20

LTC4263 TYPICAL APPLICATIONS Three Port Midspan PSE with Power Management Set for 30W ISOLATED 48V 0.1μF 0.1μF 0.1μF 20 0.1μF 100V LTC4263 DD5 DD48 LED 2 4 LEGACY PWRMGT 3 7 MIDSPAN ...

Page 21

PACKAGE DESCRIPTION 3.60 ±0.05 2.20 ±0.05 1.70 ± 0.05 RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED PIN 1 TOP MARK (SEE NOTE 6) 0.200 REF NOTE: 1. DRAWING PROPOSED TO BE MADE ...

Page 22

LTC4263 PACKAGE DESCRIPTION .050 BSC N .245 MIN .030 ±.005 TYP RECOMMENDED SOLDER PAD LAYOUT .010 – .020 × 45° (0.254 – 0.508) .008 – .010 (0.203 – 0.254) .016 – .050 (0.406 – 1.270) NOTE: INCHES ...

Page 23

... Replaced Figure 3 in Applications Information section Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights. ...

Page 24

... Dual Current Limit DC Disconnect Only With AC Disconnect Integrated Current Mode Switching Regulator www.linear.com ● – 1 – 22nF 22nF 22nF 22nF 8 2kV 1000pF 75Ω 75Ω 75Ω 75Ω 4263 TA03 JKO-0044 PULSE 4263fe LT 0610 REV E • PRINTED IN USA © LINEAR TECHNOLOGY CORPORATION 2006 ...

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