LTC4259A-1
NOT RECOMMENDED FOR NEW DESIGNSQuad IEEE 802.3af Power over Ethernet Controller with AC Disconnect
- Part Models
- 4
- 1ku List Price
- Starting From $8.30
Overview
- 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 I2C™ Serial Interface
- 4-Bit Programmable Digital Address Allows Control of Up to 64 Ports
- Current and Duty Cycle Limits Protect External FETs
- IMPROVED UVLO
The LTC4259A-1 is a quad –48V Hot Swap™ controller designed for use in IEEE 802.3af compliant Power Sourcing Equipment (PSE). It 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 allow easy scaling of current and power dissipation levels and provide protection against voltage and current spikes and ESD events.
The LTC4259A-1 is available in a 36-pin SSOP package.
We also provide solutions for 802.3af PD applications with the LTC4257, LTC4257-1 and LTC4267.
Applications
- IEEE 802.3af Compliant Endpoint and Midspan Power Sources
- IP Phone Systems
- DTE Power Distribution
Documentation
Data Sheet 1
Reliability Data 2
Design Note 2
Product Selector Card 2
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC4259ACGW-1#PBF | 36-Lead SSOP (Wide 0.3 Inch) | ||
| LTC4259ACGW-1#TRPBF | 36-Lead SSOP (Wide 0.3 Inch) | ||
| LTC4259AIGW-1#PBF | 36-Lead SSOP (Wide 0.3 Inch) | ||
| LTC4259AIGW-1#TRPBF | 36-Lead SSOP (Wide 0.3 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Aug 10, 2022 - 22_0174 Laser Top Mark Conversion for SSOP_W Package Assembled in ADPG [PNG] |
||
| LTC4259ACGW-1#PBF | PRODUCTION | |
| LTC4259ACGW-1#TRPBF | PRODUCTION | |
| LTC4259AIGW-1#PBF | PRODUCTION | |
| LTC4259AIGW-1#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
Latest Discussions
No discussions on LTC4259A-1 yet. Have something to say?
Start a Discussion on EngineerZone®