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Charge pump delivers 150mA from 1.8-5.5V input range

Posted: 28 Apr 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Linear Technology? buck boost? charge pump? LTC3240? LTC3240EDC-2.5?

Linear Technology Corp. has announced the LTC3240-2.5/3.3, a regulated buck-boost charge pump in 2-by-2mm DFN package touted to be capable of up to 150mA in output current from an input range of 1.8V to 5.5V.

When the input voltage exceeds the output voltage, the device operates in low-dropout regulator mode. And if the input voltage drops to within 100mV of the output voltage, the device automatically switches into a step-up (boost) mode.

For light loads, the LTC3240 operates in a high-efficiency, low-power Burst Mode to extend battery life. When boosting higher loads, it automatically switches into low-noise constant frequency operation.

Linear Tech said the patented constant-frequency architecture of the LTC3240 offers both low-input and low-output ripple, while its 1.2MHz switching frequency enables the use of tiny external ceramic capacitors, saving size and cost.

Low external parts count of one flying capacitor and two bypass capacitors and the low-profile package make the LTC3240 a compact solution for space-constrained applications. Other features include soft start to prevent excessive inrush current during startup, output disconnect during shutdown, and current limit and thermal shutdown circuitry.

According to the company, the LTC3240's regulated output feature makes it suitable for a variety of applications, such as two- to three-cell alkaline/NiMH or one-cell Li-ion battery for 2.5V/3.3V step-up/step-down conversion in portable products, including digital cameras, PDAs, media players, measurement instruments and cellphones. The device's low ripple performance also makes it suitable for applications sensitive to variable-frequency operation such as audio and RF supplies and thin PC and I/O cards.

The LTC3240EDC-2.5 and LTC3240EDC-3.3 are available in a 6-lead DFN (2-by-2-by-0.75mm) package. Pricing starts at $1.60 each for 1,000-piece quantities.

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Related Datasheets
Part Number Description Category
? LTC3240 3.3V/2.5V Step-Up/Step-Down Charge Pump DC/DC Converter ICs, Interface



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