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Product category: Power Supply ICs and Controllers
News Release from: Texas Instruments (April 2001-March 2006) | Subject: TPS54x80 and TPS54x73 Swift convertors
Edited by the Electronicstalk Editorial Team on 21 March 2003

Convertors tackle power supply sequencing

A novel synchronous buck DC/DC convertor family addresses critical power supply sequencing requirements in low-voltage, high-density point-of-load systems that use DSPs and FPGAs

Texas Instruments has developed a novel synchronous buck DC/DC convertor family that addresses critical power supply sequencing requirements in low-voltage, high-density point-of-load systems that use DSPs and FPGAs. By addressing important core and I/O voltage sequencing requirements, designers of multiple output power supplies are able to achieve better device operation and reliability in applications such as broadband, networking and optical communications.

TI's TPS54x80 series of Swift DC/DC convertors each contains two internal mosfets capable of supplying up to 9A of continuous output current over the entire operating temperature range.

The convertors regulate to a voltage as low as 0.891V, and use a trackin pin with a multiplexer to implement three different sequencing methods: simultaneous, sequential or ratio-metric sequencing.

'The order in which the supply outputs power up and down is critical to correct processor operation and long term reliability', said Rich Nowakowski, Product Marketing Manager for TI's Swift DC/DC convertors.

'With these new Swift devices, TI offers a simple solution to eliminate the power supply sequencing problem of multiple core and I/O voltages'.

The TPS54x80 swift convertors feature: power up/power down tracking for sequencing; low-on-resistance synchronous buck mosfet switches for high efficiency at full load source or sink current; wide PWM frequency - fixed 350kHz or adjustable 280 to 700kHz; power good and enable; and load protected by peak current limit and thermal shutdown.

In addition to the TPS54x80, TI has developed the TPS54x73 DC/DC convertors for applications that require a pre-bias output condition.

The TPS54x73 devices provide reliable power up when the core and I/O voltages of a processor are required to track each other within a certain voltage differential during startup.

The core's voltage supply output is connected to the output of the I/O voltage supply with a series of diodes.

The core voltage level is equal to the I/O voltage minus the diode voltage drop during start up.

With the disable current sinking during startup (DSDS) feature, the prebiased load cannot be pulled to ground.

The TPS54x80 and TPS54x73 Swift convertors are available in volume today through TI and its authorised distributors.

Each device is packaged in 20- or 28-pin PowerPAD thin shrink small outline package (HTSSOP) for thermal enhancement and space savings.

Suggested resale pricing starts at $3.45 per 1000 units.

The Swift software development tool supports the TPS54x80 and TPS54x73 families, which is available from the TI power website.

TI also offers evaluation modules, reference designs, application notes and other support collateral.

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