SUMMIT
MICROELECTRONICS, Inc.
Distributed Power Hot Swap Controller
SMH4803A
Preliminary
FEATURES
l
Soft Starts Main Power Supply on Card Insertion
or System Power Up
l
Senses Card Insertion via Short Pins or Ejector
Switches
l
Master Enable to Allow System Control of Power
Up or Down
w
Can be used as a Temperature Sense Input
l
Programmable Independent Controls of 3 DC/DC
Converters
w
Not Enabled until Host Supply Fully Soft
Started
w
Programmable Time Delay Between each
Enable Signal
w
Available Input to hold off Dependant Enables
until Conditions are Satisfied
l
Highly Programmable Circuit Breaker
w
Programmable Quick-Trip
TM
Values
w
Programmable Current Limiting
w
Programmable Circuit Breaker Mode:
Latched (Volatile or Nonvolatile)
w
Programmable Duty Cycle Times
w
Programmable Over-current Filter
l
Programmable Host Voltage Fault Monitoring
w
Programmable Under- voltage Hysteresis
w
Programmable UV/OV Voltage Filter
w
Programmable Fault Mode: Latched or Duty
Cycle
l
Nonvolatile Programming to Customize Features
w
Available Pre-programmed from Summit
l
2.5V and 5.0V Reference Outputs
w
Eliminates the Need or Other Primary Volt-
ages
w
Easy Expansion of External Monitor Func-
tions
l
Supply Range ±20VDC to >±500VDC
SIMPLIFIED APPLICATION DRAWING
0V
Disable / Enable
Pin Detect
R3
PD1#
VDD
ENPGA
ENPGB
PG1#
DC/DC
UV
R2
OV
R1
Pin Detect
PD2#
VSS
CBSENSE VGATE
DRAIN
SENSE
PG2#
DC/DC
SMH4803A
PG3#
DC/DC
FAULT#
2.5VREF 5.0VREF
–48V
Characteristics subject to change without notice
2051 4.4 3/15/01
2051 SAD 1.2
©SUMMIT MICROELECTRONICS, Inc., 2000 • 300 Orchard City Dr., Suite 131 • Campbell, CA 95008 • Phone 408-378-6461 • FAX 408-378-6586 • www.summitmicro.com
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SUMMIT [ SUMMIT MICROELECTRONICS, INC. ]
