SANTA CLARA, Calif. National's LM3352 is the first in a new class of high-efficiency switched-capacitor voltage regulators for buck and boost applications. The 3.3-V, 200-mA (inductorless) IC, which works at 1 MHz, has an efficiency of 80 percent, the industry's highest for this class of regulator, said National.
As such, it is an alternative to low-dropout regulators, enabling users to take full advantage of the capacity of Li-ion batteries. Its 200-mA output current is said to be the highest available in a regulated switched-capacitor dc/dc device, and thus suitable for cell phones, handheld organizers and digital cameras.
The LM3352 uses an adaptive DSP control system to optimize conversion efficiency and voltage regulation over a wide range of input voltages and load conditions. It uses so-called multiple fractional-gain modes to achieve high efficiency at high load currents, the company said. It delivers a regulated 1.8 to 4 V from a 2.5- to 5.5-V input.
The LM3352 combines switch matrix, voltage reference, shutdown logic and control circuitry in a single 16-pin TSSOP. The LM3352MTC costs $2.75 each in 1,000-piece lots.
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EETInfo No. 620