SMH4804 Datasheet | Summit Microelectronics

URES AND APPLICATIONS INTRODUCTION The SMH4804 is a user-programmable -48V power supply controller designed to control the hot-swapping of plug-in cards and to sequence supplies in a distributed power environment. The SMH4804 drives an external power MOSFET switch that connects the bus side supply to the card side load and controls in-rush current while providing both current regulation and over-current protection. When the source and drain voltages of the external MOSFET are within specification, the SMH4804 asserts four PG[4:1]# power-good logic outputs either simultaneously or sequenced at programmable intervals to enable DC-DC converters to distribute card side power. Additional Features of the device include: UV and OV monitor, master enable or temperature sense input (EN/ TS), 2.5V and 5V reference outputs for expanding monitor functions, two Pin-Detect enable inputs (PD1# and PD2#) for card insertion verification, and duty-cycle or latched over-current protection modes. All Features are programmed in nonvolatile registers through the I2C interface which is simplified with the SMX3200 interface adapter and Windows GUI software available from Summit Microelectronics. Engineers can program the device directly in-circuit with units of voltage, current and time, allowing fast design cycles. Features : - Soft Starts Main Power Supply on Card Insertion or System Power Up - In-Rush Current Limiting - Master Enable to Allow System Control of Power Up or Down - Programmable Independent Control of up to 4 DC/DC Converters via 4 Power Good Signals, PG[4:1]# - Highly Programmable Circuit Breaker Level and Mode - Programmable Quick-Trip™ Value, Current Limiting, Duty Cycle Times, and Over-Current Filter - Programmable Host Voltage Fault Monitoring - Programmable UV/OV Filter and UV Hysteresis - Programmable Fault Mode: Latched or Duty Cycle - Internal Shunt Regulator Allows for a Wide Supply Range (typically -32 to -72 Volts) - I2C 2-Wire Serial Bus Interface for...