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.
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
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.
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