Buck regulators deliver high input voltage range

Santa Clara, Calif. — National Semiconductor Corp. has added two high-efficiency SIMPLE SWITCHER synchronous buck regulators to its PowerWise energy-efficient product family. National said the highly integrated LM3102 and LM3103 devices are the industry's first synchronous buck regulators to feature an input voltage range up to 42 V.

Optimized for powering digital ICs in industrial and telecommunication applications, the LM3102 and LM3103 buck regulators deliver up to 97 percent efficiency, which is eight points higher than comparable non-synchronous products, according to National. In addition, integration of MOSFET switches and the use of small inductors enables a reduced system component count and very small solution size.

The LM3102 and LM3103 synchronous, step-down switching voltage regulators accept an input voltage between 4.5 V and 42 V and offer a programmable switching frequency up to 1 MHz. The buck regulators use a constant on-time (COT) control scheme, which requires no loop compensation. They also include a patented integrated flywheel current injection control (FCIC), which allows for the use of ceramic capacitors rather than bulkier tantalum capacitors.

The LM3102 supplies up to 2.5 A of current to loads with an output voltage as low as 0.8 V. The LM3103 supplies up to 750 mA of current to output voltages as low as 0.6 V. Both regulators are also said to feature excellent line and load regulation. The LM3102 and LM3103 also run in discontinuous mode for improved efficiency during light load conditions. The regulators will not discharge a pre-biased output capacitor during start-up, ensuring a monotonic voltage ramp. Other features include programmable soft-start, valley current limit, output over-voltage protection and thermal shutdown for extra protection.

Pricing: The LM3102 (20-pin TSSOP with exposed pad ) is priced at $2.65 each and the LM3103 (16-pin TSSOP package with exposed pad for improved thermal performance) is priced at $2.00, both in quantities of 1,000.

Availability: Available now.
Product information: LM3102, LM3103,
WEBENCH design tool, PowerWise products and power management products

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