Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LTC3203-1/B/B-1
Edited by the Electronicstalk Editorial Team on 23 October 2006
Charge pumps optimise efficiency
Linear Technology has announced the LTC3203-1/B/B-1 mode-selectable high-efficiency 500mA step-up charge pumps, offered in compact 3 x 3mm DFN packages.
Linear Technology has announced the LTC3203-1/B/B-1 mode-selectable high-efficiency 500mA step-up charge pumps, offered in compact 3 x 3mm DFN packages Featuring low-noise constant-frequency (1MHz) operation and a wide input voltage range of 2.7 to 5.5V, the LTC3203B provides an adjustable output voltage, whereas the LTC3203-1 and LTC3203B-1 have user-selectable fixed output voltage options of 4.5 or 5V to power LEDs or logic circuitry
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The chips also have two user-selectable conversion modes (1:1.5 and 1:2) to optimise the charge pump's efficiency, suitable for use in high current LED backlighting and camera light supplies for cellphones 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 minimise 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 on input and output lines) 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 low-profile 10-lead DFN (3 x 3 x 0.75mm) packages.
1000-piece pricing starts at US $2.00 each. Request a free brochure from Linear Technology Corp ...
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