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Active: In Production.

Data Sheet

FULL DATA SHEET (PDF, 432kB) Download   E-Mail

Description

Critical loads often employ parallel-connected power supplies with redundancy to enhance system reliability. The MAX8555/MAX8555A are highly integrated, inexpensive MOSFET controllers that provide isolation and redundant power capability in high-reliability systems. The MAX8555/MAX8555A are used in 0.5V to 3.3V systems, and have an internal charge pump to drive the gates of the N-channel pass elements to (VCS+ + 5V). During startup, the MAX8555/MAX8555A monitor the voltage drop across the external MOSFETs. Once VCS+ approaches or exceeds the bus voltage (VCS-), the MOSFETs are turned on. The MAX8555/MAX8555A feature a dual-purpose TIMER input. A single external resistor from TIMER to ground sets the turn-on speed of the external MOSFETs. Optionally, the TIMER input can be used as a logic enable input. Once the external MOSFET is turned on, these controllers monitor the load, protecting the bus against overvoltage, undervoltage, and reverse-current fault conditions. The MAX8555 is available with a 40mV reverse-current threshold, while the MAX8555A is available with a 20mV reverse-current threshold. Overvoltage and undervoltage fault thresholds are adjustable and can be disabled. The current-limit trip points are set by the external MOSFETs' RDS(ON), reducing component count. An open-drain, logic-low fault output indicates if an overvoltage, undervoltage, or reverse-current fault occurs. The MAX8555 and the MAX8555A can shut down in response to a reverse-current fault condition as quickly as 200ns. Both devices come in space-saving 10-pin µMAX or TDFN packages and are specified over the extended -40°C to +85°C temperature range.

An evaluation kit is available:  MAX8555AEVKIT  

Key Features		Applications/Uses
Simple, Integrated, and Inexpensive MOSFET Controllers ORing FET Drive for 0.5V to 3.3V Eliminate ORing Diode Power Dissipation Provide N+1 Redundant Supply Capability for Highly Reliable Systems Isolate Failed Short-Circuit Supply from Output BUS Respond to Reverse Short-Circuit Current in 200ns Adjustable Blank Time Programmable Soft-Start Logic Enable Input Adjustable Overvoltage and Undervoltage Trip Points Fault-Indicator Output Space-Saving Packages		Point-of-Load Supplies Power-Supply Modules Rectifiers Redundant Power Supplies in High-Availability Systems Servers Telecom Power Supplies

Diagram

Typical Operating Circuit

Evaluation Kits

MAX8555AEVKIT

Reliability Reports

Show FIT data for: MAX8555 Request Reliability Report for: MAX8555 MAX8555A

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: 1-10 of 10

MAX8555	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8555ETB-T			Active	TDFN-EP;10 pin;9.6 mm² Outline Drawing: 21-0137 (PDF) Land Pattern: 90-0003 (PDF) Use pkgcode/variation: T1033-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8555EUB			Active	µMAX;10 pin;15.4 mm² Outline Drawing: 21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8555EUB-T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX8555EUB+			Active	µMAX;10 pin;15.4 mm² Outline Drawing: 21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8555EUB+T			Active	Land Pattern: Not Available	-40°C to +85°C	See data sheet
MAX8555A	Free Sample	Buy	Status	Package: TYPE PINS FOOTPRINT   DRAWING CODE/VAR *	Temp	RoHS/Lead-Free? Materials Analysis
MAX8555AETB-T			Active	TDFN-EP;10 pin;9.6 mm² Outline Drawing: 21-0137 (PDF) Land Pattern: 90-0003 (PDF) Use pkgcode/variation: T1033-1*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8555AEUB			Active	µMAX;10 pin;15.4 mm² Outline Drawing: 21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8555AEUB-T			Active	µMAX;10 pin;15.4 mm² Outline Drawing: 21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10-2*	-40°C to +85°C	RoHS/Lead-Free: No Materials Analysis
MAX8555AEUB+			Active	µMAX;10 pin;15.4 mm² Outline Drawing: 21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis
MAX8555AEUB+T			Active	µMAX;10 pin;15.4 mm² Outline Drawing: 21-0061 (PDF) Land Pattern: 90-0330 (PDF) Use pkgcode/variation: U10+2*	-40°C to +85°C	RoHS/Lead-Free: Lead Free Materials Analysis

Related Products

MAX8535, MAX8536, MAX8585 ORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies

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