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Boost regulator has output disconnect, soft-start options

Posted: 18 Sep 2007 ?? ?Print Version ?Bookmark and Share

Keywords:boost DC/DC converters? switches?

Linear Technology Corp. announces the LTC3528/B, 1MHz, current mode, synchronous boost DC/DC converters with output disconnect and integrated soft-start capability. Their internal 1A switches can deliver output voltages as high as 5.25V from an input voltage range of 0.70V (start-up, 0.5V when running) to 5V, making them suitable for Li-ion/Polymer or single/multicell alkaline/NiMH applications.

LTC3528/B can deliver up to 200mA of continuous output current (at 3.3V) from a single alkaline cell or 400mA from dual alkaline cells. Synchronous rectification enables efficiencies of up to 94 percent while Burst Mode operation lowers quiescent current to only 12?A(LTC3528), providing extended battery runtime in handheld applications. The combination of a 2mm x 3mm DFN-8 package and a constant switching frequency of 1MHz minimize both inductor and capacitor sizes, providing a tiny solution footprint required in handheld applications.

LTC3528/B has internal switches with an RDS(ON) of only 0.175 (N-Channel) and 0.25 (P-Channel) to deliver efficiencies as high as 94 percent. The output disconnect feature allows the output to be completely discharged in shutdown. It also limits the inrush of current during start-up, minimizing surge currents seen by the input supply. The LTC3528/B will also regulate the output when the input voltage exceeds the output voltage. Additional features include anti-ringing control, short-circuit protection, soft-start and thermal protection. The LTC3528/B delivers an ideal solution for boost applications requiring up to 400mA of output current and where a small solution size and low maximum battery runtime are defining factors.

For applications demanding the lowest possible noise operation, the LTC3528B version is available with the Burst Mode feature disabled. This version runs in continuous mode at all current levels, slightly reducing light load efficiency. However, it minimizes possible interference of switching noise with onboard noise suppression circuitry.

LTC3528EDDB and LTC3528BEDDB are both available from stock in 8-lead DFN packages. Pricing for 1,000-piece quantities starts at $1.95 each.

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