SUMMIT
MICROELECTRONICS, Inc. Distributed Power Hot Swap Controller www.DataSheet4U.com
SMH4803A
Preliminary
FEATURES
...
SUMMIT
MICROELECTRONICS, Inc. Distributed Power Hot Swap Controller www.DataSheet4U.com
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-TripTM 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
Voltages w Easy Expansion of External Monitor Functions 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 su...