KTA1137A IEEE 802.3at PoE PD with Integrated DC-DC Controller Features Brief Description Fully supports both IEEE Std. 802.3af-2005 The KTA1137A is a single-chip, highly integrated CMOS solution for Power over Ethernet (PoE) Powered Devices and IEEE Std. 802.3at-2009 requiring input power of up to 30Watts. Applications 2-Event classification for 802.3at higher include Voice over IP (VoIP) Phones, Wireless LAN power PDs Access Point, Security Cameras, WiMAX Terminals, Point- Robust Type 2 PSE detector with proprietary of-Sales Terminals, RFID Readers, Thin Clients and digital filtering line noise eliminating false Notebook computers. positives IEC 61000-4-2/3/4/5/6 requirements for EMC The KTA1137A integrates input surge protection, a PD Compliance controller and a low-emission DC-DC controller. The Integrated Surge Protection for 15kV/8kV KTA1137A implements all of the physical layer Powered System level ESD Compliance Device (PD) functionality, as required by IEEE 802.3af- Exceptional EMI performance 2005 and IEEE 802.3at-2009 standards. This includes 2- Programmable DC current limit up to 730mA event classification, Type 2 PSE detection indicator (ATDET), PD detection, under-voltage lockout (UVLO), for 30W applications and Hot-Swap FET integration. Seamless support for local power, down to 9.5V The KTA1137A has been architected to address both EM Low Rds-on Hot-Swap FET (typical 0.6) emission concerns and surge/over-voltage protection in Integrated Short-Circuit Protection PoE applications. The chip implements many design Over temperature protection features that minimize transmission of system common- 5x5 mm, 20 lead QFN Package mode noise onto the Unshielded Twisted Pair (UTP). On- Industrial temperature range (-40C to +85C) chip integration of surge protection provides faster response to surge events and limits stray surge current from passing through sensitive circuits, such as the Applications Ethernet PHY. The device is designed to provide safe, low- impedance discharge paths directly to the earth ground, Pan, tilt and zoom (PTZ), security and web resulting in superior reliability and circuit protection. cameras Voice over IP (VoIP) phones Wireless LAN access points, WiMAX terminals Point-of-sale (PoS) terminals, RFID terminals Thin clients and notebook computers Fiber-to-the-home (FTTH) terminals Typical Applications 10/100/1000 RJ45 GMII Processor PHY Local Power KTA1137A Surge Protection Local LVMODE Adapter Mode Current DC-DC Signature, Extended Limit/ Controller Classification With Sense Managed Emissions Thermal UVLO Control Limit ATDET Protection AT Detection PD Controller November 2019 - Revision 04a Page 1 Company Confidential KTA1137A Pin Description Pin I/O Name Function 1 - NC No Connect 2 P VDD48O Switched 48V supply output 3 - NC No Connect 48V positive bus pin, fed by the output of the external diode bridge. This bus requires the 4 P VDD48I connection of a detection signature capacitor and resistor. Refer to Detection Mode section. 5 A GND Must be connected to paddle ground (GND) 6 A GND Must be connected to paddle ground (GND) 7 A GND Must be connected to paddle ground (GND) 8 O VDD5 Internal 5 volts bus decoupling point Current limit pin. Connection to paddle ground sets the current limit to ILIM-AF (for 13W 9 A RCURR applications). Open circuit sets the current limit to ILIM-AT (for 30W applications). 10 A RCLASS Classification resistor connection Local Voltage Mode. When pulled high, LVMODE opens the internal FET switch and keeps 11 A LVMODE the DC-DC controller active. This is a current-mode input pin. It should be pulled to GND when not in use. 12 A FB DC-DC Controller feedback point 13 A COMP DC-DC Controller error amplifier compensation network connection 14 A CSS DC-DC Controller soft-start capacitor connection point (required). 15 A CS DC-DC Controller peak-current sense input (low side) 16 O NDRV DC-DC Controller N-MOSFET gate drive 17 O VBN DC-DC Controller low-side supply decoupling 18 I FSEL Frequency Select. This pin sets the switching frequency of the DC-DC converter. IEEE 802.3at-2009 PSE detects. High level output indicates availability of higher system 19 O ATDET power, either via connection to a Type 2 PSE, or via a local power supply. 20 - NC No Connect Exposed Local analog ground. This is the negative output from the external diode bridge and is not EP GND Pad isolated from the line input. Key: I = Input, O = Output, A = Analog Signal, P = Power 20-Pin QFN Top View 20 19 18 17 16 NC 1 15 CS VDD48O 2 14 CSS 3 EP 13 NC COMP FB VDD48I 4 12 GND 5 11 LVMODE 6 7 8 9 10 Top Mark XX = Device Code YWZ = Date Code and Assembly Code November 2019 - Revision 04a Page 2 Company Confidential GND NC GND ATDET FSEL VDD5 RCURR VBN RCLASS NDRV