Attention: Anyone who owns juniors chasing Tantalum: Its major use in capacitors has been rendered obsolete.
TI Introduces Industry's Lowest Noise Switched-Cap Buck-Boost Converters For Wireless Appliances
Devices Improve Signal Quality and Reduce Component Count in Cell Phones, Wireless PDAs, and 802.11 PCMCIA Cards
TUCSON, Ariz., Sept. 21 /PRNewswire/ -- Designed for wireless appliances which demand low noise performance, Texas Instruments (NYSE: TXN - news; TI) unveiled the industry's lowest noise switched-capacitor buck-boost converters. Featuring 170-uVrms output voltage ripple (at 20Hz to 10MHz bandwidth), the devices are well suited to VCO (Voltage Controlled Oscillator) and PLL (Phase- Lock Loop) power supply applications in cellular phones, wireless personal digital assistants (PDAs), 802.11 PCMCIA cards, MP3 players, digital cameras, electronic games and SmartCard readers. See power.ti.com .
By reducing power supply noise, the TPS6024x series of switched-cap converters suppresses sideband interference and boosts channel locking, which improves overall transmission quality in wireless and RF (Radio Frequency) applications. A wide input voltage range of 1.8V to 5.5V makes the TPS6024x ideal for two and three cell nickel- or alkaline-based battery chemistries, or one-cell lithium-based battery applications, as well as fixed input voltage sources. The TPS6024x supports a 2.7V, 3V, 3.3V and 5V output with an output current up to 12mA. Normal operating current is only 250uA and the converter's shutdown mode reduces this further to a mere 100nA (typical).
The TPS6024x's proprietary dual-cap design uses four small, low cost 1uF ceramic capacitors to provide ultra-low output ripple and high efficiency, while eliminating the need for inefficient linear regulators and tantalum capacitors. Ceramic capacitors provide low ESR (equivalent series resistance), low cost and a small footprint. The dual-cap operation lowers output ripple voltage significantly compared to a standard single-phase charge pump.
In addition, the TPS6024x provides power conversion without the need of inductors, thereby eliminating common problems such as calculating inductance value, electromagnetic interference (EMI), reliability, real estate and component height. The high switching frequency (160kHz typical) also promotes small surface-mount capacitors, thus saving board space. The devices are thermally protected and current-limited for reliable operation even under persisting fault conditions.
``Our innovative dual-cap design has allowed TI to deliver an unmatched low-noise switched-cap solution for advanced wireless and RF applications, whether they use CDMA, GSM, Bluetooth, or 802.11 technology,'' said Bert Wank, strategic marketing engineer for TI's power management products. ``Manufacturers of wireless appliances will benefit from the TPS6024x's miniature size, fewer external components, and the reduction in overall solution cost.''
Availability, Packaging, Pricing
The TPS60241 (2.7V to 5.5V input, 5V output) is available today. Other versions of the series, TPS60240 (1.8V to 5.5V input, 3.3V output), TPS60242 (1.8V to 5.5V input, 2.7V output) and TPS60243 (1.8V to 5.5V input, 3V output), are scheduled for volume production in 4Q01, with samples available now. All versions are packaged in a thin MSOP-8 with a height of only 1.1mm.
Suggested resale pricing for the TPS60241 starts at $1.55 in 1,000 piece quantities.
Texas Instruments Incorporated is the world leader in digital signal processing and analog technologies, the semiconductor engines of the Internet age. The company's businesses also include sensors and controls, and educational and productivity solutions. TI is headquartered in Dallas, Texas, and has manufacturing or sales operations in more than 25 countries.
Texas Instruments is traded on the New York Stock Exchange under the symbol TXN. More information is located on the World Wide Web at: ti.com . |
