Power Electronics

Multiphase DC-DC Controllers

Texas Instruments Inc.’s (TI) new multiphase synchronous dc-dc buck controllers support 40 A to 120 A. The new pulse width modulation (PWM) single-chip controllers provide all desirable control and supervisory features for low-voltage, high-current point-of-load (POL)power supply designs.

TI’s TPS4009x family of programmable controllers manage 2-, 3- or 4-phases and offers several advantages over a single power stage, including lower current ripple on the input and output capacitors, faster transient response to load steps and improved power handling capabilities at greater than 90% power efficiency. The TPS4009x devices can operate each phase at a switching frequency up to 1 MHz, resulting in effective ripple frequency of up to 4 MHz at the input and output in a 4-phase application.

The new controllers provide single-cycle current balance that is accurate to less than 5%. Cycle-by-cycle current sharing in output phases over the entire load allows for minimal oversizing of output FETs.

For added protection of the entire system, the TPS4009x includes current sense fault protection, programmable overcurrent protection and individual phase current detection. In addition, a simple, adjustable voltage threshold sets current limit up to 200 A.

For more information, visit www.ti.com.

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