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The unique circuit design also enables National's LM2754 to "share" the battery with the RF power amplifier (PA). Rather than pulling high currentfrom the battery in parallel during transmission power bursts from the power amplifier, the LM2754's TX pin allows the device to reduce the output powerand therefore current pull from the battery. This unique feature reduces dropped calls due to two high-power loads operating at the same time.
A third unique feature protects the handheld mobile device from overheating due to the flash LED staying on too long. If the flash LED driverstays on after the picture is taken, the LED power consumption causes excessheat. National's LM2754 prevents excessive heating by automatically shutting down the LED after a time-out period.
Available in a very small, low profile 24-pin LLP(R) package, the LM2754provides a total solution size of less than 28 mm squared and can also drive flash LEDS made up of one, two three, or four smaller white LEDs. Competitive devices drive just one large flash LED, which provides less flexibility to themobile device designer in component selection.
For more information on the LM2754 or to order samples, visithttp://www.national.com/pf/LM/LM2754.html .
About National's Power Management Products
National Semiconductor is the number one supplier of voltage regulator ICswith 14 percent market share, according to iSuppli's 2005 Semiconductor MarketShare survey. National's innovative power management products include best-in-class linear regulators; power monitoring, control and reference ICs;and switching converters, such as high-voltage ICs for DC-DC conversion, switched capacitor converters, lighting management ICs and inductive switchingconverters. National also offers online tools that enable power designers toselect the best power management chips for their applications. National's Webench(R) design tool allows designers to choose a product, create and analyze a design, and then build custom prototypes that can be deliveredwithin 24 hours. More information about National's power management productsis available at http://power.national.com .