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SMH4803AS Datasheet(PDF) 3 Page - Summit Microelectronics, Inc. |
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SMH4803AS Datasheet(HTML) 3 Page - Summit Microelectronics, Inc. |
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3 / 19 page  3 2051 4.4 3/15/01 SMH4803A Preliminary SUMMIT MICROELECTRONICS, Inc. PIN CONFIGURATION 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 en- able input. If EN/TS is less than 2.5V, VGATE will be disabled. This pin has an internal 200k Ω 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 50k Ω 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 50k Ω pull-up to 5V. MODE (8) The state of the MODE signal determines how fault conditions are cleared. The device is in the latched mode when the signal is held at VSS, and the cycle mode when held at 5V or left floating. This pin has an internal 50k Ω pull-up to 5V. CBSENSE (9) The circuit breaker sense input is used to detect over- current conditions across an external, low value sense resistor (RS) tied in series with the Power MOSFET. A voltage drop of greater than 50mV across the resistor for longer than tCBD will trip the circuit breaker. A program- mable Quick-Trip™ sense point is also available. 20-Pin SOIC 2051 PCon 1.0 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 DRAIN SENSE VGATE EN/TS PD1# PD2# FAULT# RESET# MODE CBSENSE VSS VDD PG2# PG1# PG3# ENPGA ENPGB 2.5VREF 5.0VREF OV UV 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 hot- swapping and secondary voltage sequencing in multi- supply 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 con- verters. Its reference voltages provide isolation between primary and secondary voltages, but allow expansion of its features. |
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