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Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 656kB) Download   E-Mail

Description

The MAX5945 quad network power controller is designed for use in IEEE® 802.3af-compliant power-sourcing equipment (PSE). The device provides power devices (PD) discovery, classification, current-limit, and both DC and AC load disconnect detections. The MAX5945 can be used in either endpoint PSE (LAN switches/routers) or midspan PSE (power injector) applications. The MAX5945 can operate autonomously or be controlled by software through an I²C-compatible interface. Separate input and output data lines (SDAIN and SDAOUT) allow usage with optocouplers. The MAX5945 is a slave device. Its four address inputs allow 16 unique MAX5945 addresses. A separate active-low INT output and four independent shutdown inputs (active-low SHD_) allow fast response from a fault to port shutdown. An active-low RESET input allows hardware reset of the device. A special watchdog feature allows the hardware to gracefully take over control if the software crashes. A cadence timing feature allows the MAX5945 to be used in midspan systems. The MAX5945 is fully software configurable and programmable. A class-overcurrent detection function enables system power management to detect if a PD draws more current than the allowable amount for its class. Other features are input under/overvoltage lockout, overtemperature protection, output-voltage slew-rate limit during startup, power-good, and fault status. The MAX5945's programmability includes gate-charging current, current-limit threshold, startup timeout, overcurrent timeout, autorestart duty cycle, PD disconnect AC detection threshold, and PD disconnect detection timeout. The MAX5945 is available in a 36-pin SSOP package and is rated for both extended (-40°C to +85°C) and commercial (0°C to +70°C) temperature ranges.

An evaluation kit is available:  MAX5945EVKIT, MAX5945EVSYS  

Key Features		Applications/Uses
IEEE 802.3af Compliant Controls Four Independent, -48V-Powered Ethernet Ports in Either Endpoint or Midspan PSE Applications Wide Digital Power Input, VDIG, Common-Mode Range: VEE to (AGND + 7.7V) PD Violation of Class Current Protection PD Detection and Classification Provides Both DC and AC Load Removal Detections I²C-Compatible, 3-Wire Serial Interface Fully Programmable and Configurable Operation Through I²C Interface Current Foldback and Duty-Cycle-Controlled/Programmable Current Limit Short-Circuit Protection with Fast Gate Pulldown Direct Fast Shutdown Control Capability Programmable Direct Interrupt Output Watchdog Mode Enable Hardware Graceful Takeover		Midspan Power Injector Power-Over-LAN/Power-Over-Ethernet Power-Sourcing Equipment (PSE) Switches/Routers

Diagram

Typical Operating Circuit

Application Notes

Application Note 3912: Low-Cost, Complete Power Solution for Powered Devices Includes a 12V Buck Converter - MAX5945 Application Note 4091: Reference Design for Power-over-Ethernet (PoE) Midspan or Endspan Insertion - MAX5945

Evaluation Kits

MAX5945EVKIT, MAX5945EVSYS

Reliability Reports

Show FIT data for: MAX5945 Request Reliability Report for: MAX5945

Software/Models

none

Ordering Information

Notes: Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales. Didn't Find What You Need? Ask our applications engineers. Expert assistance in finding parts, usually within one business day. Part number suffixes: T or T&R = tape and reel;+ = RoHS/lead-free;# = RoHS/lead-exempt. More: SeeFull Data Sheet or Part Naming Conventions. * Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.

Devices: 1-8 of 8

MAX5945	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX5945CAX			Active	SSOP;36 pin;163.4 mm² Outline Drawing: 21-0040 (PDF) Land Pattern: 90-0098 (PDF) Use pkgcode/variation: A36MK-4*	0°C to +70°C	See data sheet
MAX5945CAX+			Active	SSOP;36 pin;163.4 mm² Outline Drawing: 21-0040 (PDF) Land Pattern: 90-0098 (PDF) Use pkgcode/variation: A36MK+4*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5945CAX+T			Active	SSOP;36 pin;163.4 mm² Outline Drawing: 21-0040 (PDF) Land Pattern: 90-0098 (PDF) Use pkgcode/variation: A36MK+4*	0°C to +70°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5945CAX-T			Active	Land Pattern: Not Available	0°C to +70°C	See data sheet
MAX5945EAX			Active	SSOP;36 pin;163.4 mm² Outline Drawing: 21-0040 (PDF) Land Pattern: 90-0098 (PDF) Use pkgcode/variation: A36MK-4*	-40°C to +85°C	See data sheet
MAX5945EAX-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX5945EAX+			Active	SSOP;36 pin;163.4 mm² Outline Drawing: 21-0040 (PDF) Land Pattern: 90-0098 (PDF) Use pkgcode/variation: A36MK+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5945EAX+T			Active	SSOP;36 pin;163.4 mm² Outline Drawing: 21-0040 (PDF) Land Pattern: 90-0098 (PDF) Use pkgcode/variation: A36MK+4*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2005-09-28  Product Ad: Download

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