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Product Name: Power management unit is first with integrated buck-boost converter, charger
Product Description
National Semiconductor Corporation introduces what it says is the first flexible power management unit (PMU) with an integrated buck-boost converter to its family of digitally programmable, multiple-output power management devices
supply, a buck-boost converter extends battery life. Li-Ion batteries, a popular choice for portable media players, have an operating voltage range of 2.9V to 4.2V. When the Li-Ion battery is fully charged, the converter steps the voltage down to supply the hard disk drive. When the battery voltage is lower than 3.3V, the converter steps up the voltage. This technique increases the run-time of the player up to 10 percent over the run-time achieved by a traditional buck converter.
The highly-integrated LP3910 flexible PMU includes two buck regulators that provide up to 96 percent efficiency. Power consumption is further minimized through a dynamic voltage-scaling feature that enables the device to adjust or scale the output voltage in real time to match the computing workload and clock frequencies of the corresponding processors. The end result is longer battery life in energy-sensitive systems such as personal media players.
Together, the integrated features simplify the design process for developers of portable media applications, maximize power savings and minimize board space. National's LP3910 will be shown in National's booth in hall A4, stand #506 at the Electronica trade show in Munich, Germany, from November 14-17.
Available in a small, 48-pin LLP package that measures 6 mm by 6 mm, National's LP3910 is a programmable system PMU that is optimized for portable media players with hard disk drives. It incorporates two low-dropout (LDO) voltage regulators, two integrated buck converters with dynamic voltage scaling, a wide-load-range buck-boost converter with programmable output voltage, a 4-channel, 8-bit A/D converter for managing the battery usage and a dual-source Li-Ion/polymer battery charger. The charger has the capability to charge and maintain a single-cell battery from a regulated wall adapter or USB power.
For applications using Flash memory or products without a hard drive, National offers the LP3913 with the same features as the LP3910, but a 500 mA buck converter replaces the buck-boost converter.
Company Details
The Power Management DesignLine site is managed by Editor Paul O'Shea.
Starting out his career in the "Live Music Capital" city of Austin, Texas more than 20 years ago, Paul began with testing the Texas Instruments Business Systems, and moved on... more
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