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SMH4803A Dataheets PDF



Part Number SMH4803A
Manufacturers Summit Microelectronics
Logo Summit Microelectronics
Description Distributed Power Hot-Swap Controller
Datasheet SMH4803A DatasheetSMH4803A Datasheet (PDF)

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 E.

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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 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 1 SMH4803A www.DataSheet4U.com Preliminary FUNCTIONAL BLOCK DIAGRAM ENPGB 15 ENPGA 16 VDD 20 12VREF 14 2.5VREF 50kΩ 50kΩ 17 PG3# 50kΩ 200kΩ 50kΩ PROGRAMMABLE DELAY + – + – FILTER + – 13 5.0VREF EN/TS 3 PD1# 4 PD2# 5 UV 11 + – 19 PG2# PROGRAMMABLE DELAY 18 PG1# OV 12 5V 12V 2.5V VSS 10 DRAIN 1 SENSE 50kΩ 50kΩ 2 VGATE VGATE SENSE MODE 8 RESET# 7 PROGRAMMABLE DELAY + – CBSENSE 9 FAULT LATCH AND DUTY CYCLE TIMER 6 FAULT# 50mV + Programmable Quick Trip Ref. Voltage – 2051 BD 1.3 2 2051 4.4 3/15/01 SUMMIT MICROELECTRONICS, Inc. SMH4803A www.DataSheet4U.com Preliminary PRODUCT DESCRIPTION The SMH4803A is an integrated solution for high reliability systems to monitor and react to events that could have a detrimental effect on a system. It can contain or limit faults to a single circuit board before that fault propagates to the system. Its programmability lets a single board satisfy multiple circuit demands while customized to meet special requirements. The SMH4803A monitors and controls the primary voltage in a distributed power system while providing for both hotswapping and secondary voltage sequencing in multisupply systems. The primary power source can be shut down if events are sensed that could result in damage to either the circuit board or the system supply. An external FET switch is used to soft start the primary voltage once normal operating conditions are met. The external FET also uses an external shunt to monitor current for the circuit breaker function. The SMH4803A sequences secondary voltage by timed or externally controlled outputs that enable DC/DC converters. Its reference voltages provide isolation between primary and secondary voltages, but allow expansion of its features. PIN CONFIGURATION 20-Pin SOIC DRAIN SENSE VGATE EN/TS PD1# PD2# FAULT# RESET# MODE CBSENSE VSS 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 VDD PG2# PG1# PG3# ENPGA ENPGB 2.5VREF 5.0VREF OV UV 2051 PCon 1.0 PIN DESCRIPTIONS DRAIN SENSE (1) The DRAIN SENSE input monitors the voltage at the drain of the external power MOSFET switch with respect to VSS. An internal 10µA source pulls the DRAIN SENSE signal towards the 5V reference level. DRAIN SENSE must be held below 2.5V to enable the PG outputs. VGATE (2) The VGATE output activates an external power MOSFET switch. This signal supplies a constant current output (100µA typical), which allows easy adjustment of the MOSFET turn on slew rate. EN/TS (3) The Enable/Temperature Sense input is the master enable input. If EN/TS is less than 2.5V, VGATE will be disabled. This pin has an internal 200kΩ pull-up to 5V. PD1# and PD2# (4 & 5) These are logic level active low inputs that can optionally be employed to enable VGATE and the PG outputs when they are at VSS. These pins each have an internal 50kΩ pull-up to 5V. FAULT# (6) This is an open-drain, active-low output that indicates the fault status of the device. RESET# (7) Reset# is used to clear latched fault conditions. When this pin is held low the VGATE and PG outputs are disabled. Refer to the Circuit Breaker Operation and the associated timing diagrams for detailed characteristics. This pin has an internal 50kΩ pull-up to 5V. MODE (8) The state of the MODE signal determines how fault conditions are clear.


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