Summit Unveils Power Supply Manager with 1% Voltage Threshold Accuracy

9/8/2003 - Summit Microelectronics has introduced the SMT4004A, a four-channel, truly differential tracking power supply controller that is supplemented with comprehensive monitoring and supervisory functions. It adds to Summit's growing family of differential tracking power supply controllers. Typical applications for the device include server, networking and communications equipment where carrier-class availability (ie, 99.999% up-time) is required.

The SMT4004A is configurable to differentially track up to four power supplies, typically within 100mV of each other, as they follow a selected 100, 250, 500 or 1000 V/Sec internally generated ramp during power up or power down. This assures that processor, ASIC & FPGA multi-rail components in the user's circuit do not latch up and experience immediate destruction or later reliability problems. The differential voltage between the two supplies must be held to a small voltage (~300mV for some advanced DSP devices).

Summit's tracking controllers provide true differential tracking both on and off with guaranteed matching between supplies to protect devices. Approaches being touted in the market as being tracking, but which really do not track, put these sensitive circuits in jeopardy because they do not monitor/control both the power source and load of each supply.

The SMT4004A operates from any one of the four power supply voltages down to 2.7V and can control supplies as low as 0.9V. Four independent resets, two interrupts, a forced shutdown circuit-breaker function, and crowbar shutdown functions are selectable and programmable by the user.

The SMT4004A provides 256 x 8 bits of nonvolatile memory to the user, and is accessed using the popular I2C bus to exercise complete control of the board's power characteristics. The device can therefore be programmed during production, or each time the board is booted up, or during normal operation "on the fly."

To speed user product development using the SMT4004A and Summit's other programmable products, Summit offers customers the SMX3200 programming system. This is a complete development system that lets designers easily manipulate the characteristics of their system. The SMX3200 design kit includes menu-driven Microsoft Windows® graphical user interface (GUI) software to automate programming tasks and also includes the necessary hardware to interface to the parallel port of a laptop or PC.

Once a user completes design and prototyping, the SMX3200 automatically generates a HEX data file that can be transmitted to Summit for review and approval. Summit then assigns a unique customer identification code to the HEX file and programs the customer's production devices prior to final electrical test operations. This ensures the device will operate properly in the end application. The design kit software can be downloaded today from Summit's website (

An evaluation card containing the SMT4004A controller, support circuitry, and a port for "plug and play" programming via the SMX3200 dongle interface are available.

Available in volume quantities today, the SMT4004A comes in a 48-pin TQFP surface-mount package. Commercial temperature range pricing is $8.65 in 10,000 unit quantities.

Summit Microelectronics supplies semiconductors that manage power functions in communications, networking, storage and server systems. With 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.

1717 Fox Drive
San Jose, CA 95131
Tel: +1.408-436-9890

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