ST Creates Ultra-Low-Power Precision Temperature Sensor for 3G Phones

STMicroelectronics (NYSE: STM) announced a precision temperature sensor with an ultra-low supply current requirement of less than 4.3-microamps (typical) and a tiny 4-lead UDFN package, making it ideal for 3G cell phones and other battery applications where low power, coupled with small size, accuracy and linearity over the full temperature range, are essential. The new STLM20 is the lowest-current drop-in replacement for industry-standard LM20 devices, and is the first in a new series of precision temperature sensors from ST.

STMicroelectronics STLM20 Ultra-Low-Power Precision Temperature Sensor

The new device is an analog-output temperature sensor operating over a –55 to +130 degrees C temperature range. At 25 degrees C the precision sensor’s temperature-to-voltage accuracy is plus or minus 1.5 degrees C, and it is plus/minus 2.5 degrees C over the entire operating temperature range. The STLM20 is supplied in a tiny 1.0mm x 1.3mm x 0.5mm thick 4-lead UDFN package – as well as in 5-lead SOT323 (SC70) – to meet the demands of space constrained products.

Operating from a supply voltage of 2.4V to 5V, the STLM20 draws a maximum of 8µA over the full temperature range. It is targeted for the RF section of 3G mobile phones and multimedia PDAs, monitoring transmitter power amplifiers to guarantee linearity as required by the W-CDMA (Wideband Code Division Multiple Access) 3G standards. The STLM20 is also suitable for temperature-compensated crystal oscillators and battery chargers and other portable applications, such as GPS devices and medical instruments.

The STLM20 is available now, priced at $0.25 in high volumes.

About STMicroelectronics
STMicroelectronics is a global leader in developing and delivering semiconductor solutions across the spectrum of microelectronics applications. An unrivalled combination of silicon and system expertise, manufacturing strength, Intellectual Property (IP) portfolio and strategic partners positions the Company at the forefront of System-on-Chip (SoC) technology and its products play a key role in enabling today’s convergence markets. The Company’s shares are traded on the New York Stock Exchange, on Euronext Paris and on the Milan Stock Exchange. In 2005, the Company’s net revenues were $8.88 billion and net earnings were $266 million.