MAX8585
MAX8585
PRODUCTIONORing MOSFET Controllers with Fastest Fault Isolation for Redundant Power Supplies
Simplest, smallest OR-ing MOSFET Controllers with Fastest Reverse-Current Protection
- Part Models
- 2
- 1ku List Price
- Starting From $6.21
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Overview
- 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
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 VCC + 10V. The MAX8536 is used in 3.3V and 5V systems, with a chargepump output of VCC + 5V.
During startup, the MAX8535/MAX8536/MAX8585 monitor the voltage drop across external MOSFETs. Once VCC 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' RDS(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.
Applications
- 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
Documentation
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| MAX8585EUA+ | Micro-MAX, Thin Shrink Small-Outline | ||
| MAX8585EUA+T | Micro-MAX, Thin Shrink Small-Outline |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Apr 20, 2026 - 2571B PIN/ERRATA |
||
| MAX8585EUA+T | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareEvaluation Kits
Evaluation Kit for the MAX8536
Evaluation Kit for the MAX8535
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