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500mA Low Noise, High Efficiency Dual Mode Charge Pumps in 3mm x 3mm DFN Package

5th January 2007

ES Admin

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Linear Technology has announced the LTC3203-1/B/B-1 mode-selectable, high efficiency 500mA step-up charge pumps, offered in a compact 3mm x 3mm DFN package. Featuring low-noise constant-frequency (1MHz) operation and a wide input voltage range of 2.7V to 5.5V, the LTC3203B provides an adjustable output voltage, while the LTC3203-1 and LTC3203B-1 have user-selectable fixed output voltage options of 4.5V or 5V to power LEDs or logic circuitry. The chips also have two user-selectable conversion modes (1:1.5 and 1:2) to optimize the charge pump's efficiency, suitable for use in high current LED backlighting and camera light supplies for cell phones and PDAs, USB-powered devices, and for general 3.3V or Li-Ion to 5V conversion.

The LTC3203-1 features automatic Burst Mode® operation at light load to achieve a low supply current of 120uA. The LTC3203B and LTC3203B-1's patented constant-frequency architecture ensures both low input and output ripple at all loads to minimize switching noise, and both are ideal for applications sensitive to variable-frequency operation. Other features of the LTC3203-1/B/B-1 include automatic soft start circuitry to prevent excessive inrush current during startup, load disconnect from the input during shutdown, plus short-circuit and thermal shutdown protection.

The LTC3203-1/B/B-1's high switching frequency enables the use of tiny external ceramic capacitors, saving size and cost. Low external parts count (two flying capacitors and two bypass capacitors at VIN and VOUT) and the low profile DFN package achieves an extremely compact solution for space-constrained applications.

The LTC3203EDD-1, LTC3203BEDD and LTC3203BEDD-1 are available in the low-profile 10-lead DFN (3mm x 3mm x 0.75mm) package. 1,000-piece pricing starts at $2.00 each.