SUMMIT
MICROELECTRONICS, Inc.
Programmable Distributed Power Hot-Swap Controller
for High-Availability Systems
FEATURES
Soft Starts Main Power Supply on Card Insertion
or System Power Up
Senses Card Insertion via Short Pins or Ejector
Switches
Master Enable to Allow System Control of
Power Up or Down
Can be used as a Temperature Sense Input
Programmable Independent Controls of a DC/DC
Converter
Not Enabled until Host Supply Fully Soft
Started
Programmable Time Delay
Available Input to hold off Dependant En-
ables until Conditions are Satisfied
Highly Programmable Circuit Breaker
Programmable Quick-Trip
TM
Values
Programmable Current Limiting
Programmable Duty Cycle Times
Programmable Over-current Filter
SMH4811A
Preliminary
Programmable Host Voltage Fault Monitoring
Programmable Under-Voltage Hysteresis
Programmable UV/OV Voltage Filter
Programmable Fault Mode: Latched or Duty
Cycle
Programmable Forced Shutdown Timer
2.5V and 5.0V Reference Outputs
Eliminates the Need for Other Primary
Voltages
Easy Expansion of External Monitor Func-
tions
Internal Shunt Regulator Allows a Wide Supply
Range
SIMPLIFIED APPLICATION DRAWING
0V
Disable/Enable
VDD
Pin Detect
PD1#
ENPG
FAULT#
UV
SMH4811A
OV
PG#
DC/DC
Pin Detect
PD2#
VSS
CBSENSE VGATE 2.5VREF 5.0VREF
–48V
2044 SAD 5.1
©SUMMIT MICROELECTRONICS, Inc., 2006 • 757 North Mary Ave • Sunnyvale, CA 94085 • Phone 408-523-1000 • FAX 408-523-1266 • www.summitmicro.com
Characteristics subject to change without notice
2044 6.6
03/27/09
1
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
