IEEE 802.3bt-Compliant, Powered Device Interface Controller
Description
The KTA1140 is a single-chip, highly integrated CMOS solution for Power over Ethernet (PoE) Powered Devices requiring input power of up to class 8 and 90Watts. Applications include Voice over IP (VoIP) Phones, Wireless LAN Access Point, Security Cameras, WiMAX Terminals, Point-of-Sales Terminals, RFID Readers, Thin Clients and Notebook computers.
The KTA1140 implements all of the physical layer Powered Device (PD) functionality, as required by IEEE® 802.3af-2003, IEEE® 802.3at-2009 and IEEE® 802.3bt- 2018 standards. This includes 5-event classification, Type 1-2 or 3-4 PSE detection indicators (PST1/2 and PSDBT), PD detection, under-voltage lockout (UVLO), and Hot-Swap FET integration.
The KTA1140 has been architected to address EM emission concerns in PoE applications. The chip implements many design features that minimize transmission of system common-mode noise onto the Unshielded Twisted Pair (UTP).
The device is designed to provide safe, low-impedance discharge paths directly to the earth ground, resulting in superior reliability and circuit protection.
Features
- Fully supports IEEE® Std. 802.3bt
- Supports Input Power Levels Up to 90W
- Compatible with both IEEE® Std. 802.3af/at
- Support Class 0-8 for PD
- Robust Type 1, 2, 3 and 4 PSE detector with proprietary digital filtering line noise
- Auto-adjust Maintain Power Signature (MPS) for Type 1-4 PSE
- Supports up to 5 Event Classification
- Programmable DC current limit up to 2.3A for 90W applications
- IEC 61000-4-2/3/4/5/6 requirements for EMC Compliance
- Exceptional EMI performance
- Low Rds-on 100 V Hot-Swap FET (typical 0.1Ω)
- Integrated Short-Circuit Protection
- Over temperature protection
- Seamless support for local power down to 9.5V
- Supports Low Power Standby Modes
- 5×5 mm, 20 lead WQFN Package
- -40°C to +125°C Junction Temperature Range)
Applications
- Pan, tilt and zoom (PTZ), security and web cameras
- Voice over IP (VoIP) phones
- Lighting and High Power Wireless Data Systems
- Wireless LAN access points, WiMAX terminals
- Point-of-sale (PoS) terminals, RFID terminals
- Thin clients and notebook computers
- Fiber-to-the-home (FTTH) terminals
Packaging Information
| Package | Dimensions | Pins | Package Type |
| WQFN55-20 | 5.00mm x 5.00mm x 0.65mm | 20 | UAQ |
Parameters
| Vin (min) | Vin (max) | PoE PD Support | Control | Topology | Number of Output Rails | High Voltage Isolation |
| 37V | 57V | 802.3af | HW Mode | Flyback, Buck | 1 | External |
Technical Documentation
| Description | Documents | Type |
|---|---|---|
| Datasheet | KTA1140-04a | |
| Package Outline Drawing | WQFN55-20 UAQ POD |
Purchase
| Purchase Options |
|---|
| Buy from Digi-Key |
| Buy from Mouser |
