SMH4804
-48V
Programmable Hot Swap Sequencing Power
Controller
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 Programming, Power
On/Off and Operational Status
APPLICATIONS
Telecom Hot-Swap Card
Distributed
Power Architectures
Power-on
LAN, IEEE 802.3
INTRODUCTION
The
SMH4804 is a user-program0mable -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.
SMH4804
48-Pin TQFP PINOUT (PDF pg
9)
SUMMIT Microelectronics, Inc. reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. SUMMIT Microelectronics, Inc. assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement. Charts and schedules contained herein reflect representative operating parameters, and may vary depending upon a user’s specific application. While the information in this Microelectronics, Inc. shall not be liable for any damages arising as a result of any error or omission.
SUMMIT Microelectronics, Inc. does not recommend the use of any of its products in life support or aviation applications where the failure or malfunction of the product can reasonably be expected to cause any failure of either system or to significantly affect their safety or effectiveness. Products are not authorized for use in such applications unless SUMMIT Microelectronics, Inc. receives written assurances, to its satisfaction, that: (a) the risk of injury or damage has been minimized; (b) the user assumes all such risks; and (c) potential liability of SUMMIT Microelectronics, Inc. is adequately protected under the circumstances.
Revision 3.8 - This document supersedes all previous versions.
I2C is a trademark of Philips Corporation.
PICMG and AdvancedTCA are trademarks of the PCI Industrial Computers Manufacturers Group (PICMG).
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