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Charge pump doublers deliver low-noise operation

Posted: 11 Aug 2005     Print Version  Bookmark and Share

Keywords:linear technology  ltc3204b  charge pump doubler  ltc3204bedc-3.3  ltc3204bedc-5 

Linear Technology Corp. unveiled its LTC3204B-3.3/5 charge pump doublers that are offered in the 2-by-2mm DFN packages. Featuring low-noise constant-frequency (1.2MHz) operation, the LTC3204B-3.3 generates a regulated boosted output voltage of 3.3V from a minimum input voltage of 1.8V (2 AA cell alkaline or NiMH) at output currents up to 50mA, while the LTC3204B-5 produces a 5V output from a minimum 2.7V (Li-ion battery) input voltage at currents up to 150mA.

According to the company, the LTC3204B is ideal for applications sensitive to variable-frequency operation. The device's patented constant-frequency architecture ensures both low input and low output ripple, especially at light loads, to minimize switching noise. Other features include automatic soft start circuitry to prevent excessive inrush current during startup, load disconnect from the input during shutdown, and current limit and thermal shutdown circuitry.

Linear Tech added that the LTC3204B's high 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 in addition to the low profile DFN package, make the LTC3204B a compact solution for space-constrained applications.

Both the LTC3204BEDC-3.3 and LTC3204BEDC-5 are available in the low-profile 6-lead DFN (2-by-2-by-0.75mm) package. Pricing starts at $1.50 each in 1,000-piece orders.

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