Power Electronics

DC-DC Converter Drives Power Rails

Linear Technology announces the LT3510, a dual current-mode PWM step-down dc-dc converter with two internal 2.5-A power switches. The IC’s wide input range of 3.3 V to 25 V makes it ideal for regulating power from a wide variety of sources, including 5-V and 12-V rails. Each channel is capable of delivering up to 2 A of continuous output current at efficiencies up to 88%.

Independent input voltage, feedback, soft-start and power good pins for each channel simplify complex power supply tracking and sequencing. The LT3510's switching frequency is user programmable between 250 kHz and 1.5 MHz.

Both of the LT3510's converters are synchronized to either an external clock input or an internal oscillator and maintain a 180° phase offset between channels to reduce voltage ripple and input capacitor size. An internal 0.80-V reference enables output voltages below 1 V. Independent, sequential, ratiometric or absolute tracking is possible between the outputs.

Low drop out internal switches enable duty cycles to reach 95% while internal cycle-by-cycle current limit provides protection against shorted outputs. The low current (less than 10 μA) shutdown offers extended run-time in battery-powered systems.

The LT3510EFE is available now in a thermally enhanced TSSOP-20 package. There is also an "I" Grade temperature version, the LT3510IFE. Pricing starts at $3.25 and $3.90 each, respectively, for 1000-piece quantities.

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