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Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 300kB) Download   E-Mail

Description

The MAX5079 ORing MOSFET controller replaces ORing diodes in high-reliability redundant, parallel-connected power supplies. Despite their low forward-voltage drop, ORing Schottky diodes cause excessive power dissipation at high currents. The MAX5079 allows for the use of low-on-resistance n-channel power MOSFETs to replace the Schottky diodes. This results in low power dissipation, smaller size, and elimination of heatsinks in high-power applications. The MAX5079 operates from 2.75V to 13.2V and includes a charge pump to drive the high-side n-channel MOSFET. Operation down to 1V is possible if an auxiliary voltage of at least 2.75V is available. When the controller detects a positive voltage difference between IN and BUS, the n-channel MOSFET is turned on. The MOSFET is turned off as soon as the MAX5079 sees a negative potential at IN with respect to the BUS voltage, and is automatically turned back on when the positive potential is restored. Under fault conditions, the ORing MOSFET's gate is pulled down with a 1A current, providing an ultra-fast 200ns turn-off. The reverse voltage turn-off threshold is externally adjustable to avoid unintentional turn-off of the ORing MOSFET due to glitches at IN or BUS caused by hot plugging the power supply. Additional features include an OVP flag to facilitate shutdown of a failed power supply due to an overvoltage condition, and a PGOOD signal that indicates if VIN is either below the undervoltage lockout or VBUS is in an overvoltage condition. The MAX5079 operates over the -40°C to +85°C temperature range and is available in a space-saving 14-pin TSSOP package.

An evaluation kit is available:  MAX5079EVKIT  

Key Features		Applications/Uses
2.75V to 13.2V Input ORing Voltage 1V to 13.2V Input ORing Voltage with 2.75V Aux Voltage Present 2A MOSFET Gate Pulldown Current During Fault Condition Ultra-Fast 200ns, MOSFET Turn-Off During Fault Condition Supply Undervoltage and Bus Overvoltage Detection Power-Good (PGOOD) and Overvoltage (OVP) Outputs for Fault Detection Space-Saving 14-Pin TSSOP Package -40°C to +85°C Operating Temperature Range		Base-Station Line Cards N+1 Redundant Power Systems Networking Line Cards Paralleled DC-DC Converter Modules RAID Servers

Key Specifications:  ORing MOSFET Controllers
Part Number	Reverse Current Protect.	Under Voltage Protect	Charge Pump Cap.	Soft Start	Enable	Fault Indicator	Package/Pins	Smallest Available Pckg. (mm2)	Oper. Temp. (°C)	Price
								max w/pins		See Notes
MAX5079	Yes	Yes	No	Yes	No	Yes	TSSOP/14	33	-40 to +85	$1.21 @1k
See All ORing MOSFET Controllers (5)

Diagram

Typical Operating Circuit

Evaluation Kits

MAX5079EVKIT

Reliability Reports

Reliability Report: MAX5079.pdf Show FIT data for: MAX5079

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: 1-4 of 4

MAX5079	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX5079EUD			Active	TSSOP;14 pin;33 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX5079EUD-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX5079EUD+			Active	TSSOP;14 pin;33 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX5079EUD+T			Active	TSSOP;14 pin;33 mm² Outline Drawing: 21-0066 (PDF) Land Pattern: 90-0113 (PDF) Use pkgcode/variation: U14+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

More Information

New Product Press Release 2005-04-07

Related Products

More Like This: View Product Families for Similar Products See All ORing MOSFET Controllers (5 Products)

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Description   Key Features   Applications/Uses   Key Specifications   Diagram

Data Sheet   Application Notes   Design Guides   Engineering Journals   Reliability Reports   Software/Models   Evaluation Kits

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Document Ref.: 19-3584; Rev 1; 2009-05-27
This page last modified: 2009-05-27