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LTC4259A-1

Features: Controls Four Independent 48V Powered Ethernet Ports Each LTC4259A-1 Port Includes: IEEE 802®.3af Compliant PD Detection and Classification Output Current Limit with Foldback Short-Circuit Protection with Fast Gate Pull-Down PD Disconnect Using AC or DC Sensing Improved AC Disconne...

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SeekIC No. : 004402529 Detail

LTC4259A-1: Features: Controls Four Independent 48V Powered Ethernet Ports Each LTC4259A-1 Port Includes: IEEE 802®.3af Compliant PD Detection and Classification Output Current Limit with Foldback Short-C...

LTC4259A-1 Data Sheet

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Part Number:
LTC4259A-1
Supply Ability:
5000

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  • 1~5000
  • Unit Price
  • Negotiable
  • Processing time
  • 15 Days
Total Cost: $ 0.00

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Product Details

Description



Features:

Controls Four Independent 48V Powered Ethernet Ports
Each LTC4259A-1 Port Includes:
IEEE 802®.3af Compliant PD Detection and Classification
Output Current Limit with Foldback
Short-Circuit Protection with Fast Gate Pull-Down
PD Disconnect Using AC or DC Sensing
Improved AC Disconnect
Improved UVLO
Operates Autonomously or Controlled by I2CTM Serial Interface
4-Bit Programmable Digital Address Allows Control of Up to 64 Ports
Current and Duty Cycle Limits Protect External FETs
IMPROVED UVLO
Available in a 36-pin SSOP package.


Application

IEEE 802.3af Compliant Endpoint and Midspan Power Sources
IP Phone Systems
DTE Power Distribution


Pinout

Connection Diagram 


Specifications

(Note 1)
Supply Voltages
VDD to DGND .......................................... 0.3V to 5V
VEE to AGND .......................................... 0.3V to 70V
DGND to AGND (Note 2) ...................................... ±1V
Digital Pins
SCL, SDAIN, SDAOUT, INT, AUTO, RESET
SHDN n, AD n ................. DGND 0.3V to DGND + 5V
Analog Pins
GATE n (Note 3) ................... VEE 0.3V to VEE + 12V
DETECT n Peak Currents (Note 4) ................. ±80mA
SENSE n ................................ VEE 0.3V to VEE + 1V
OUT n ................................... VEE 70V to VEE + 70V
OSCIN ........................... DGND 0.3V to DGND + 5V
BYP Current .................................................... ±1mA
Operating Ambient Temperature Range
LTC4259AC-1 ...................................... 0°C to 70°C
LTC4259AI-1 .................................. 40°C 85°C
Junction Temperature (Note 5) ..................... 150°C
Storage Temperature Range .... .. 65°C to 150°C
Lead Temperature (Soldering, 10 sec)........... 300°C



Description

The LTC4259A-1 is a quad 48V Hot SwapTM controller designed for use in IEEE 802.3af compliant Power Sourcing Equipment (PSE). LTC4259A-1 consists of four independent ports, each with output current limit, short-circuit protection, complete Powered Device (PD) detection and classification capability, and programmable PD disconnect using AC or DC sensing. Used with power MOSFETs and passives as in Figure 1, the LTC4259A-1 can implement a complete IEEE 802.3af-compliant PSE.

The LTC4259A-1 can operate autonomously or be controlled by an I2C serial interface. Up to 16 LTC4259A-1s may coexist on the same data bus, allowing up to 64 powered Ethernet ports to be controlled with only two digital lines. Fault conditions are optionally signaled with a programmable INT pin to eliminate software polling.

External power MOSFETs, current sense resistors and diodes of LTC4259A-1 allow easy scaling of current and power dissipation levels and provide protection against voltage and current spikes and ESD events.

Linear Technology also provides solutions for 802.3af PD applications with the LTC4257, LTC4257-1 and LTC4267.




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