Product category:
Power Supply ICs and Controllers
News Release from: Advanced Analogic Technologies | Subject: AAT2120 and AAT2158
Edited by the Electronicstalk Editorial
Team on 11 October 2007
Switching regulators offer low noise
The AAT2120 and AAT2158 synchronous step-down convertors deliver significantly lower spectral noise and output ripple than competing switching regulators.
Advanced Analogic Technologies (AnalogicTech) has released switching regulators designed for low-noise operation The AAT2120 and AAT2158 synchronous step-down convertors deliver significantly lower spectral noise and output ripple than competing switching regulators
This article was originally published on Electronicstalk on 11 Oct 2007 at 8.00am (UK)
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At lower currents, the AAT2120 and AAT2158 switching regulators produce half the ringing amplitude of competing switching regulators.
This characteristic translates directly into lower noise injection into the system.
In system tests, spurious energy injected by the switching regulators was reduced by 3dB.
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At higher currents, the two new convertors produce approximately 25% less output ripple.
By reducing injected noise and output ripple, these two new devices can improve the dynamic range performance of RF systems compared to powering these systems with traditional switching regulators.
At the same time the AAT2120 and AAT2158 offer all the traditional power efficiency advantages of traditional switching regulators.
Power efficiency for the AAT2120 and AAT2158 reach up to 96% and 95% respectively.
Moreover, by operating at high switching frequencies, both devices minimise the size of external components.
The AAT2120 supplies up to 500mA output current, while the AAT2158 delivers up to 1.5A output for applications requiring higher levels of power.
Both devices operate from an input range of 2.7 - 5.5V DC and support output voltages as low as 0.6V.
For protection purposes, both step-down convertors offer internal soft-start, over-temperature and current limit protection.
The new convertors also extend system run time by adding 100% duty cycle low-dropout operation.
Qualified across the -40 to +85C temperature range, the AAT2120 is available in a Pb-free, 8-pin 2 x 2mm2 STDFN package.
The AAT2158 is also qualified across the -40 to +85C temperature range and comes in a Pb-free, 16-pin 3 x 3mm2 QFN package.
Designers of noise-sensitive systems, such as mobile phones, media players or Bluetooth accessories, prefer to use higher efficiency switching regulators to maximise battery life, but are often unable to do this because traditional switching regulators inject too much noise into the system Instead they turn to low-noise, but lower efficiency linear regulators.
The AAT2120 and AAT2158 offer designers a chance to take advantage of the power efficiency advantages of switching regulators in noise-sensitive communication, high speed interfaces and other applications.
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