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

Description

Critical loads often employ parallel-connected power supplies with redundancy in order to enhance system reliability. The MAX8535/MAX8536/MAX8585 are highly integrated but inexpensive MOSFET controllers that provide isolation and redundant power capability in high-reliability systems. The MAX8535/MAX8585 are used in 12V systems, and have an internal charge pump to drive the gates of the n-channel pass elements to V_CC + 10V. The MAX8536 is used in 3.3V and 5V systems, with a chargepump output of V_CC + 5V.

During startup, the MAX8535/MAX8536/MAX8585 monitor the voltage drop across external MOSFETs. Once V_CC approaches or exceeds the bus voltage, the MOSFETs are turned on. The MAX8535/MAX8536/MAX8585 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 pin. Once the device is turned on, the MAX8535/MAX8536/MAX8585 monitor the load, protecting against overvoltage, undervoltage, and reverse-current conditions.

Overvoltage and undervoltage fault thresholds are adjustable and can be disabled. The current-limit trip points are set by the external MOSFETs' R_DS(ON), reducing component count. An open-drain logic-low fault output indicates if an overvoltage, undervoltage, or reverse-current fault occurs.

All devices come in a space-saving 8-pin µMAX® package and are specified over the extended -40°C to +85°C temperature range.

Key Features

Applications/Uses

Simple, Integrated, and Inexpensive ORing MOSFET Controller
ORing MOSFET Drive for 12V (MAX8535/MAX8585) and 3.3V or 5V (MAX8536) Bus
Eliminates ORing Diode Power Dissipation and Reverse Leakage Current
Provides N + 1 Redundant Supply Capability for Highly Reliable Systems
Isolates Failed Supply from Output Bus in <1µs
Reverse-Current Flow Detection
Programmable Soft-Start
Logic-Enable Input
Adjustable Overvoltage and Undervoltage Trip Points
Fault-Indicator Output
Space-Saving 8-Pin µMAX Package

	Network/Telecom Power Supplies
	On-Board Redundant Power Supplies in Blade Servers
	Rectifiers
	Redundant Power Supplies in High-Availability Systems
	Silver Box Supplies for Servers

Key Specifications: ORing MOSFET Controllers

Part Number

Reverse Current Protection

Under-Voltage Protection

Charge-Pump Capacitor

Soft Start

Enable

Fault Indicator

EV-Kit

RoHS Available

Package

Operating Temp. Range (°C)

Price^**

MAX8535

Yes

uMAX/8

-40 to +85

$1.50 @ 1k

MAX8536

$1.50 @ 1k

See All ORing MOSFET Controllers (5)

Notes:
^**This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

Ordering Information

Notes:

Other options and links for purchasing parts are listed at: http://www.maxim-ic.com/sales.
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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: 1-14 of 14

MAX8535

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX8535EUA

uMAX;8 pin;
Dwg: 21-0036 (PDF)
Use pkgcode/variation: U8-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX8535EUA-T

uMAX;8 pin;
Dwg: 21-0036 (PDF)
Use pkgcode/variation: U8-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX8535AEUA-T

uMAX;8 pin;
Dwg: 21-0036 (PDF)
Use pkgcode/variation: U8-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX8535EUA+

uMAX;8 pin;
Dwg: 21-0036 (PDF)
Use pkgcode/variation: U8+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8535EUA+T

uMAX;8 pin;
Dwg: 21-0036 (PDF)
Use pkgcode/variation: U8+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8535AEUA

uMAX;8 pin;
Dwg: 21-0036 (PDF)
Use pkgcode/variation: U8-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX8536

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX8536EUA+

uMAX;8 pin;
Dwg: 21-0036 (PDF)
Use pkgcode/variation: U8+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8536EUA+T

uMAX;8 pin;
Dwg: 21-0036 (PDF)
Use pkgcode/variation: U8+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8536EUA-T

uMAX;8 pin;
Dwg: 21-0036 (PDF)
Use pkgcode/variation: U8-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX8536EUA

uMAX;8 pin;
Dwg: 21-0036 (PDF)
Use pkgcode/variation: U8-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX8585

Free
Sample

Buy

Package:	TYPE PINS FOOTPRINT
	DRAWING CODE/VAR *

Temp

RoHS/Lead-Free?
Materials Analysis

MAX8585EUA+

uMAX;8 pin;
Dwg: 21-0036 (PDF)
Use pkgcode/variation: U8+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8585EUA+T

uMAX;8 pin;
Dwg: 21-0036 (PDF)
Use pkgcode/variation: U8+1*

-40°C to +85°C

RoHS/Lead-Free: Lead Free
Materials Analysis

MAX8585EUA

uMAX;8 pin;
Dwg: 21-0036 (PDF)
Use pkgcode/variation: U8-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis

MAX8585EUA-T

uMAX;8 pin;
Dwg: 21-0036 (PDF)
Use pkgcode/variation: U8-1*

-40°C to +85°C

RoHS/Lead-Free: No
Materials Analysis