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Boost regulators set new standard

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NATIONAL Semiconductor, represented by Arrow Electronics , has introduced the industry's most powerful boost regulators in a tiny package. The two products set a new standard for power density by combining current-mode control, sub-miniature packaging and high switching frequency.

The new standard is made possible by National's analogue bipolar CMOS DMOS (ABCD)150 process, the fundamental element in its new family of high-frequency SOT-23 regulators.

These easy-to-use regulators enable a high-performance 3W step-up converter in a PCB area of less than 0.8cm2 to meet the power needs of digital cameras, cell phones, PCMCIA and USB peripherals and DSL modems.

The first two converters of the family, LM2731 and LM2733, operate at 600kHz or 1.6MHz switching frequency, are housed in a SOT23, 5-pin package, and utilise current-mode control for superior load and line regulation. The LM2731 has a 22V, 1.5A switch, and the LM2733 has a 1A, 40V switch.

Cell phone vendors are differentiating their products by adding digital cameras; consumers want the new camera feature in the same form factor without added bulk. The LM2731 is the ideal part to power the flash in the limited area available for the latest generation of cameras.

Many line-powered systems distribute 3.3V and 5V, but need 12V, 15V, etc., generated at the point of load. The LM2731/33 family provides a tiny and high-performance solution to this problem.

USB and PCMCIA devices get 4.5-5V from the host but often need 5V or 12V. Some Lithium-Ion powered systems such as cell phones and digital cameras use four or more white LEDs to illuminate a colour LCD display.

The LM2731 provides the power necessary for these applications without the audible and electrical noise associated with variable frequency solutions.

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