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Synchronous boost regulator comes with output disconnect, LDO

Posted: 21 Feb 2008 ?? ?Print Version ?Bookmark and Share

Keywords:Linear LTC3537? DC/DC converter? LDO?

Linear Technology Corp. introduces the LTC3537, a 2.2MHz current mode synchronous boost DC/DC converter with integrated output disconnects plus an LDO. The LTC3537's boost converter's internal 600mA switches can deliver output voltages as high as 5.25V from an input voltage range of 0.68V at start-up (0.5V when running) to 5V, making it ideal for Li-ion/polymer or single/multicell alkaline/NiMH applications. The LTC3537 can deliver up to 100mA of continuous output current (at 3.3V) from a single alkaline cell or 300mA from a dual-cell input. Synchronous rectification enables efficiencies of up to 94 percent while a 2.2MHz switching frequency minimizes the total solution footprint.

The second channel, a 100mA LDO, has an input range of 1.8-5.5V and can deliver outputs as low as 0.6V. It can be driven by either the input voltage source or the boost converter's output, providing design flexibility. The LDO channel's 100mV dropout voltage and 24db ripple rejection offer a compact and low noise secondary output, says Linear.

With both channels in operation, the burst mode operation or the boost channel lowers quiescent current to only 30uA, providing extended battery run-time in handheld applications. For lower noise operation, the burst mode feature can be disabled. Other features include power good indicators for both channels, a low battery comparator and thermal overload protection. The combination of its high switching frequency and 3mm x 3mm QFN package provides a very compact solution for dual rail handheld applications. Price starts at $2.40 each for 1,000 pieces. Linear Technology Corp. is one of the exhibitors in the upcoming IIC-China 2008.

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Related Datasheets
Part Number Description Category
? LTC3537 2.2 MHz, 600mA Synchronous Step-Up DC/DC Converter and 100mA LDO ICs, Interface



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