Linear Technology Introduces High Efficiency Dual Mode Step-Up Charge Pump

Linear Technology Corporation introduces the LTC3203-1/B/B-1, a selectable, high efficiency 500mA step-up charge pump in a compact 3mm x 3mm DFN package. The LTC3203B features a low noise constant frequency (1MHz) operating mode and a wide input voltage range of 2.7V to 5.5V with adjustable output voltage; the LTC3203-1 and LTC3203B-1 have a user selectable fixed output of 4.5V or 5V. Voltage option to power LEDs or logic circuits. The chips also feature user-selectable conversion modes (1:1.5 and 1:2) to optimize the efficiency of the charge pump, making them ideal for high-current LED backlighting and camera light power supplies for cellular phones and PDAs, and USB-powered products. A typical 3.3V or lithium ion battery to 5V voltage conversion. The LTC3203-1 operates in burst mode (BurstMode®) at light loads to achieve a low supply current of 120uA.

The LTC3203B and LTC3203B-1's patented constant frequency architecture ensures low input and output ripple for all load conditions to minimize switching noise, both of which are ideal for variable frequency operation sensitive applications. . Other features of the LTC3203-1/B/B-1 include an automatic soft-start circuit that prevents excessive inrush current during startup, load and input disconnects during shutdown, and short-circuit and thermal shutdown protection. The high switching frequency of the LTC3203-1/B/B-1 allows the use of tiny external ceramic capacitors, reducing the size and cost of the solution.

The low number of external components (two floating capacitors and two bypass capacitors at VIN and VOUT) and the flat DFN package allow for a very compact solution for space-constrained applications. The LTC3203EDD-1, LTC3203BEDD and LTC3203BEDD-1 are available in a flat 10-lead DFN (3mm x 3mm x 0.75mm) package. Buy in 1,000-piece quantities starting at $2.00 each.

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