Summit Microelectronics Intros SMH4802 Controller

Summit Microelectronics (San Jose, CA) announced its new SMH4802 fully integrated, programmable, hot-swap controller for -48V power supplies. The SMH4802 has the ability to perform remote power-on/off, latch-off, and power-on delays over the industry-standard I2C bus for use in -48V distributed power systems and emerging applications using this bus standard.

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 on-the-fly configurability and redundant power supply to the system. 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 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 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.

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.