SUMMIT
MICROELECTRONICS, Inc.
Distributed Power Hot-Swap Controller
SMH4812
Preliminary
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 Enables
until Conditions are Satisfied
!
Highly Programmable Circuit Breaker
"
Programmable Quick-Trip
TM
Values
"
Programmable Current Limiting
"
Programmable Duty Cycle Times
"
Programmable Over-current Filter
!
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 Volt-
ages
"
Easy Expansion of External Monitor Func-
tions
!
Supply Range +20VDC to >+500VDC
SIMPLIFIED APPLICATION DRAWING
0V
Disable/Enable
VDD
Pin Detect
PD1#
ENPG
FS#
FAULT#
UV
SMH4812
OV
PG2#
DC/DC
Pin Detect
PD2#
VSS
CBSENSE VGATE 2.5VREF 5.0VREF
–48V
Characteristics subject to change without notice
2055 4.1 03/27/09
2055 SAD 1.1
©SUMMIT MICROELECTRONICS, Inc., 2000 • 757 N. Mary Ave. • Sunnyvale, CA 94085 • Phone 408-523-1000 • FAX 408-523-1266 • www.summitmicro.com
1
SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
