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Charge pump doubler's high switching frequency saves size, cost

Posted: 03 Feb 2005 ?? ?Print Version ?Bookmark and Share

Keywords:linear technology? ltc3204? charge pump doubler? EETA?

Charge pump doubler's high switching frequency saves size, cost

Two charge pump doublers in a 2-by-2mm DFN package was recently released by Linear Technology Corp. Featuring low-noise constant-frequency (1.2MHz) operation, the LTC3204-3.3 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. Meanwhile, the LTC3204-5 produces 5V output from a minimum 2.7V (Li-ion battery) input at currents up to 150mA.

The LTC3204 features automatic Burst Mode operation at light loads, which provides a low supply current of 48�A and helps extend battery run time. A patented constant-frequency architecture offers both low input and low output ripple to minimize switching noise, added the company. Other features include automatic soft start circuitry to prevent excessive inrush current during startup, load disconnect from the input during shutdown, plus current limit and thermal shutdown circuitry.

The LTC3204's high 1.2MHz switching frequency enables the use of tiny external ceramic capacitors. According to Linear Tech, this saves size and cost.

Both the LTC3204EDC-3.3 and LTC3204EDC-5 are available in the 6-lead DFN (2-by-2-by-0.75mm) package. For 1,000-piece orders, prices start at $1.50 each.

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