60 V step-up/down DC-DC converter

27 August 2003 Power Electronics / Power Management

Linear Technology has introduced a burst mode operation high voltage (60 V), 200 kHz, current mode DC-DC converter that provides both step-up and step-down regulation using a single inductor. The LT3433 is said to be the power industry's first high voltage buck-boost regulator. It operates from an input voltage range of 4 to 60 V, delivering regulated outputs between 3,3 and 20 V.

Certain applications, such as automotive, must regulate a fixed output voltage even though the battery voltage may fluctuate above and below the output. A popular example of this requirement is the 'cold-crank' condition encountered in automotive applications. In this instance, a 5 V (or 12 V) output is required even when the battery voltage declines to 4 V during cold crank and quickly returns to a nominal 12 to 14 V immediately following ignition.

Although most automotive applications use a 12 to 42 V nominal input voltage, transient conditions such as 'load-dump' or two batteries in series during a jump start require input voltage capability to 60 V to reliably operate. The LT3433 offers a 1% regulation transitioning from step-up to step-down in this scenario. Also, as many of these applications are also 'always-on,' low quiescent current is equally important to preserve battery life when the car is not running. The LT3433's Burst Mode operation reduces no-load quiescent current to only 100 µA.

The LT3433 incorporates dual internal 500 mA switches, which seamlessly switch between step-down and step-up voltage conversion. Internal control circuitry monitors system conditions and converts from a single switch buck operation to dual switch bridged operation as required by the application. Current limit foldback and frequency foldback help prevent inductor current runaway during start-up, while programmable soft-start helps prevent output overshoot at start-up.

The LT3433 comes in the compact TSSOP-16 package.

For more information contact Memec SA, 011 897 8600.

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