General 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 VCC + 10V. The MAX8536 is used in 3.3V and 5V systems, with a charge-pump output of VCC + 5V.

Features

♦ 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

Applications

   Silver Box Supplies for Servers

   On-Board Redundant Power Supplies in Blade Servers

   Network/Telecom Power Supplies

   Rectifiers

   Redundant Power Supplies in High-Availability Systems