Product category:
Power Supply ICs and Controllers
News Release from: Advanced Analogic Technologies | Subject: AAT1230
Edited by the Electronicstalk Editorial
Team on 19 April 2006
Convertor is ideal power source for
OLEDs
By offering hysteretic control and high stability while minimising leakage current losses, AnalogicTech's AAT1230 is the ideal application-specific power solution for OLED modules.
As portable system designers move to OLEDs to take advantage of their thin form factor, lower power requirements and wider viewing angle, they need step-up convertors with a fast transient response and "zero" leakage when not active to preserve battery life By offering hysteretic control and high stability while minimising leakage current losses, AnalogicTech's AAT1230 is the ideal application-specific power solution for OLED modules
This article was originally published on Electronicstalk on 19 Sep 2008 at 8.00am (UK)
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The AAT1230 is a 2MHz, 18V, 100mA step-up convertor optimised for powering both organic LED (OLEDs) and general purpose LCD and CCD modules in portable systems.
Using an advanced architecture developed by AnalogicTech, the AAT1230 delivers fast transient response and excellent load isolation while dramatically reducing system footprint.
Stability is a major concern in boost convertor design.
Further reading
Step-down convertors boost efficiency
Family offers designers of LAN equipment operating off a low-cost 12V adapter an ideal opportunity to boost efficiency and reduce product footprint.
Two convertors in one boost efficiency
Devices combine two buck convertors with a low input voltage used to post-regulate the second buck convertor.
To address this issue, the AAT1230 combines a high frequency convertor capable of reaching 2MHz with a hysteretic feedback loop-based control mechanism to support very fast transient response and remain stable over a wide load and input voltage range without additional compensation components.
Moreover, the device's high switching frequency enables the use of extremely small inductors and capacitors.
The AAT1230 also adds a new feature designed to address the leakage current losses inherent when conventional step-up convertors drive OLEDs.
To minimise current losses, designers using conventional boost convertors typically use a load switch and control circuitry to disconnect the convertor when the OLED module is disabled.
AnalogicTech's AAT1230 adds a true load disconnect function which isolates the load from the power source when EN/SET is pulled low.
Leakage current is less than 1uA.
This function allows designers to simplify their design by eliminating the load switch and control circuitry.
To support most current OLED modules, the output voltage on the AAT1230 can be dynamically set by activating either of two reference levels via the SEL logic pin.
As future generation OLED applications become increasingly sophisticated, designers will require more complex control mechanisms.
A dynamic output control function in the AAT1230 allows designers to easily and simply make that transition.
Through an enable set pin, this feature allows designers to program output brightness to any of 16 different levels via AnalogicTech's Simple Serial Control (S2Cwire) interface.
The AAT1230 also offers a number of safety features including cycle-by-cycle current limit, short-circuit and overtemperature protection circuits.
Specified over the -40 to +85C temperature range, the AAT1230 is available in a Pb-free, 12-pin TSOPJW package.
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