San Jose, Calif. - Summit Microelectronics
has expanded its communications power management family with the introduction of an innovative power supply
management controller. The SMT4504 combines three of the most essential power management functions - voltage
tracking, supply sequencing and voltage monitoring - in a single chip. Furthermore, this new device eliminates the
need for external MOSFET switches, thereby reducing board space and cost. Using Summit's SMT4504, system designers
can tailor their power control circuit to the system requirements by digitally programming the most essential
functions and parameters.
The SMT4504 provides a complete quad supply rail
management, while incorporating a level of programmability and integration previously missing in power management
offerings. The device can track or sequence up to four external DC/DC converter ICs with programmable sequence
ordering and delay times, without the need for any external components. In addition, when supplies are assigned to
the same sequence position, the SMT4504 allows these rails to be tracked at the same or different (ratiometric) slew
rates - a very useful feature for applications requiring supplies to be started at the same time but to ramp up at
The SMT4504 is the first true "loss-less
tracker" on the market, eliminating the need for external series MOSFETs by interfacing directly to the converter's
TRIM input pin. This allows designs to reduce board space, component count and power dissipation. Moreover, the
elimination of MOSFET switches results in improved load regulation, a critical performance parameter in applications
utilizing low core voltages.
Continuing the tradition of offering
high levels of design flexibility, the SMT4504 allows many of the essential parameters to be programmed and
therefore adjusted to new design requirements. This allows original equipment and original design manufacturers
(OEMs and ODMs) to reduce their development time and engineering investment and bring products to market faster and
The SMT4504 incorporates Summit's proprietary
"Link" function that provides seamless expanding operation when more than 4 supplies are involved. This allows
several SMT4504 devices to control up to 48 power supplies in a single system. Furthermore, it offers the ability to
accurately (1%) monitor each channel for detecting under- and over-voltage conditions. These voltage trip-points, as
well as the fault trigger conditions and output polarities, are programmable, allowing for great design flexibility.
Programmable slew rate control is also available to enable power supply rails to rise and fall at different
The SMT4504 can work with point-of-load
(POL) and monolithic DC/DC converters making it ideal for modern designs that require tracking, sequencing and
voltage detection. Applications include Datacom/Telecom equipment, servers, storage and other equipment utilizing
multi-voltage CPUs, DSPs and ASICs.
Programming is achieved via a convenient I2C bus and
configuration data is safely stored in non-volatile EEPROM memory. 4k bytes of EEPROM memory are available for user
data storage allowing customers to store data, such as board serial number, manufacturing date, revision number,
etc. The devices can be programmed during development and then used in a "fixed" configuration or they may be
re-programmed in-system via the I2C interface.
Packaging, Pricing, and
The SMT4504 device can operate directly from a +2.7V to +5.5V logic supply rail or
from an 8V or 12V intermediate bus. It is offered in both the commercial and the industrial operating temperature
range and packaging is the 48-lead TQFP. Available now in production quantities, the SMT4504 is priced at $6.80 each
in the commercial temperature range and $9.63 each in the industrial temperature range in quantities of 1,000
Design Software and Programmer for Prototype Development
To speed user
product development, Summit offers customers the SMT4504 companion evaluation board is provided with a graphical
user interface (GUI) software so designers can quickly see the features and benefits and design a prototype power
supply system with the SMT4504. This is a complete development tool that lets designers easily manipulate the
characteristics of their systems. The SMT4504EV design kits includes menu-driven Microsoft Windows® graphic user
interface (GUI) software to automate programming tasks and also includes all necessary hardware to interface to the
parallel or USB port of a laptop or PC.
Once a user completes design and prototyping, the SMT4504 kit
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 that the device will operate properly in the end application. The
design kit software can be downloaded today from Summit's website (www.summitmicro.com).