Summit Releases Fully Integrated, Programmable Hot-Swap Controller

4/14/2003 - Summit Microelectronics has announced availability of the SMH4802 fully integrated, programmable hot swap controller for -48V power supplies.

Hot swap capability is a critical element in a high-availability system, to allow add-in cards to be removed from or inserted into a fully powered host platform without an interruption in the system's operation and without damage to any of the devices on the board. This provides a mechanism for the replacement of faulty boards, addition of new boards or the reconfiguring of a system without down-time, and is built into the SMH4802. The SMH4802 has the ability to perform remote power-on/off, latch-off and power-on delays over the industry standard IC bus for use in -48V distributed power systems and emerging applications using this bus standard.

The SMH4802 also provides both soft-start power-up and "circuit-breaker" functions to protect against over-current conditions. During power-up, under-voltage and over-voltage monitors in the controller first verify that the input voltage is within the user-specified range; once these requirements are met, the hot-swap controller will then turn on an external power MOSFET to ramp up the supply voltage in a controlled, well-behaved manner. Sustained over-current events can damage the host supply and/or the load circuitry, causing a system to fail. To prevent this, the device features a programmable forced-shutdown "circuit-breaker" that can be set to either latch off, or reactivate after a two-second cooling-down period.

Typical applications are those with -48V power distribution, including high-availability servers, such as those used in Internet access; central office switches; and telecommunications line cards that demand both on-the-fly configurability and redundant power supply to the system.

Design Kit for Automated Prototype Development
To speed design and product development using the SMH4802, Summit offers the SMX3200 programming system. As with all Summit design kits, the SMX3200 is a complete development tool that lets designers easily manipulate the characteristics of their power management system. The SMX3200 design kit includes menu-driven Microsoft Windows® graphic user interface (GUI) software to automate programming tasks and also includes all necessary cabling hardware to interface from the parallel port of a laptop or desktop PC for in-circuit programming in the user's prototype.

Upon completion of prototyping, the source file is converted to an object file for transmittal to Summit for review and approval. Summit then assigns a unique customer identification code to the file and will program the customer's production devices prior to final electrical test. This ensures that the device will operate properly in the end application. The design kit software can be downloaded now from Summit's website

Pricing, Availability and Target Applications
The SMH4802 is available now in both the commercial and industrial temperature ranges in a 14-pin surface-mounted SOIC package. Commercial-range pricing is $2.50 in quantities of 10,000 units.

About Summit
Summit Microelectronics supplies semiconductors that manage the power functions in communications, networking, storage and server systems. Using Summit's programmable analog technology, customers can achieve carrier-class availability, the highest standard of reliability available today for telecommunications, data communications and Internet applications. Founded in 1997, Summit is headquartered in San Jose, California. The Company is ISO 9001 certified. Summit's website is

Previous Page | News by Category | News Search

If you found this page useful, bookmark and share it on: