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Dual step-down DC/DC delivers 3A per channel

Posted: 14 Dec 2006 ?? ?Print Version ?Bookmark and Share

Keywords:DC/DC? converters? power management? Linear Technology? DC/DC converter?

Linear Technology has announced a dual-current mode PWM step-down DC/DC converter with two internal 3.5A power switches packaged in a 20-lead TSSOP-20E package. Each channel of the LT3501 is capable of delivering up to 3A of continuous output current at efficiencies up to 88 percent. Independent input voltage, feedback, soft-start and power good pins for each channel simplify complex power supply tracking and sequencing requirements.

The LT3501's wide input range of 3.3-25V makes it suitable for regulating power from a wide variety of sources, including 5V and 12V rails, unregulated wall transformers, lead acid batteries and distributed power supplies. Its switching frequency is user programmable between 250kHz and 1.5MHz, allowing optimization between efficiency and external component size.

Both of the device's converters are synchronized to 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 0.80V reference enables sub 1V output voltages required to power the latest generation of low voltage DSPs and MCUs. Independent, sequential, ratiometric or absolute tracking is easily attained between the outputs. Low drop-out internal switches enable duty cycles to reach 95 percent while internal cycle-by-cycle current limit provides protection against shorted outputs. The low current (<10?A) shutdown offers extended run-time in battery-powered systems.

The LT3501EFE is available from stock in a thermally enhanced TSSOP-20 package. There is also an "I" Grade temperature version, the LT3501IFE. Pricing starts at $3.50 and $4.20 each, respectively, for 1,000-piece quantities.

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Related Datasheets
Part Number Description Category
? LT3501 Monolithic Dual Tracking 3A Step-Down Switching Regulator ICs, Interface



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