New Products
October 22, 2009
TI Introduces Synchronous DC-DC Boost Converter With Integrated Current-Limiting Switch
Texas Instruments Inc. (TI) introduced two integrated products designed to provide power and protection for USB ports. The TPS2500 and TPS2501 incorporate a boost switching regulator with an onboard current-limiting switch that are said to save space and cost by providing an integrated solution that meets 5-V USB power requirements from a 1.8 - 5.25V input. The output current limit can be programmed via an external resistor from as low as 130mA to as high as 1400mA, supporting up to two USB ports from a single device.
The onboard switching regulator is a highly efficient synchronous boost converter, with greater than 94% efficiency for 3.3V inputs at typical USB current ranges. The TPS2500 features a pulse-skipping mode for high efficiency at light loads, while the TPS2501 employs fixed-frequency operation across the load range for EMI sensitive designs. Both devices are designed for battery powered portable devices, set top boxes, printers or any USB application without native 5V supply.
Key features and benefits of the TPS2500 include: integrated boost converter and switch saves space and optimizes designs; wide Vin range of 1.8 - 5.25V is optimized for single-cell Li-ion battery applications; the auxiliary 5.1V output eliminates the need for additional 5V dc-dc supply; and the current limiting range from 0.13 - 1.4A is the optimal current range for USB-powered applications.
The TPS2500 and TPS2501 are available now in a 10-pin SON package, priced at $1.20 in quantities of 1,000.
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Primitive batteries capable of producing ½ volt of electricity were made in Mesopotamia between around 200 B.C. and 200 A.D. They were used mainly for electroplating silver onto copper.