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Low noise AS1353 and AS1356 LDO regulators offer an optimal solution to avoid system damage from reversed battery or supply voltages

austriamicrosystems (SWX: AMS), a leading global designer and manufacturer of analog integrated circuits (ICs) for communication, industrial, medical and automotive applications, has expanded its Low Dropout Regulator (LDO) portfolio. The new AS1353 and the AS1356 ICs are optimized to deliver improved operating times in battery-powered portable equipment such as PDAs, digital cameras, Bluetooth and GPS modules as a result of their extremely low dropout voltage.

The AS1353 features extraordinarily low noise of only 30µVrms between 10Hz and 100kHz. This allows the use of a small and less expensive 1µF ceramic output capacitor. With a power-supply rejection ratio of 57dB at 100kHz the AS1353 perfectly fulfils the noise requirements for a variety of wireless applications. Additionally the AS1356 offers a "power good" signal that indicates when the output voltage is within the tolerance of five percent.

"Electronic systems are very sensitive to negative supplies which can occur when a battery is reversed or poles are connected incorrectly. In the worst case, negative supplies can destroy the whole system," said Walter Moshammer, marketing director, Standard Linear, at austriamicrosystems. "The AS1353 and the AS1356 are a perfect choice to protect a system. The reverse battery protection feature ensures that no negative voltage hits the system if a battery is installed incorrectly. Additionally the AS1353/56 family offers ultra low dropout voltage and outstanding dynamic performance which is ideal for battery-powered or wireless devices."

An enable pin with a turn-on time of only 150µs allows system-level dynamic power management. The AS1353/56 LDO regulator family features a voltage drop of only 60mV at 150mA output current, going down to 20mV at 50mA. Furthermore, it offers over-temperature and over-current protection. With ensured 150mA output current, the AS1353/56 family delivers sufficient power for various applications.

With an operating input voltage between 2.5V and 5.5V, the AS1353/56 LDO regulator family is available in a variety of pre-programmed output voltages between 1.5V and 3.6V. The output voltage is regulated to an accuracy of one per cent, which meets the requirements of portable battery powered products.

The AS1353/56 family is available in a five-pin SOT23 package and is operating in a temperature range from -40 to +85°C.

About austriamicrosystems
austriamicrosystems is a leading designer and manufacturer of high performance analog ICs, combining more than 25 years of analog design capabilities and system know-how with its own state-of-the-art manufacturing and test facilities. austriamicrosystems leverages its expertise in low power and high accuracy to provide industry-leading customized and standard analog products. Operating worldwide with more than 1,000 employees, austriamicrosystems focuses on the areas of power management, sensors & sensor interfaces, portable audio and car access in its markets Communications, Industry & Medical and Automotive, complemented by its Full Service Foundry activities. austriamicrosystems is listed on the SWX Swiss Exchange in Zurich (ticker symbol: AMS).