DC to DC Power Supplies (Converters)
DC/DC Converter powers series-connected white LEDs.
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Press Release Summary:
Delivering 50 mA up to 24 V, Model AAT1231 drives 6 white LEDs in series or up to 12 white LEDs in parallel/series configuration using digital single-wire interface. Inductive boost dc/dc converter has 2 MHz switching frequency, operates over -40° to +85°C temperature range, and is available in Pb-free, 12-pin TSOPJW package. Protection features include integrated soft-start, current limit, over-temperature, and over-voltage protection.
Original Press Release:
AnalogicTech's New Inductive Boost DC/DC Converter with Single-Wire, Digital Brightness Control Powers Series-Connected White LEDs
SUNNYVALE, Calif., July 24 - Advanced Analogic Technologies Incorporated (AnalogicTech) (NASDAQ:AATI), a developer of power management semiconductors for mobile consumer electronic devices, today announced the AAT1231, a high frequency, high efficiency inductive boost DC/DC converter for controlling white LEDs in portable systems operating from single-cell lithium-ion/polymer batteries. Delivering 50mA up to 24V, this new device is capable of driving up to six white LEDs in series or up to 12 white LEDs in a parallel/series configuration using AnalogicTech's digital Simple Serial Control(TM) (S(2)Cwire(TM)) single-wire interface.
"The former de facto standard PWM techniques to control series-connected LEDs produce variations in current and therefore LED brightness. In addition, PWM control methods consume microcontroller processing resources, require GPIO interfaces, and demand a large number of additional components," said Adolfo Garcia, Product Line Director for AnalogicTech. "With the AAT1231, designers can use a single wire to digitally control the LEDs, which provides flicker-free light output, reduces MCU clock cycles, saves GPIO resources, and builds a complete solution with fewer components."
Consistent Brightness
LED output current on the AAT1231 is controlled using AnalogicTech's S(2)Cwire interface in 16 linear steps. By changing the feedback voltage with the SEL pin, designers can extend the output voltage another 16 levels. This allows designers to 'set and forget' the output across a total of 26 steps (after overlap) from 7.5% to 100%. Digital control improves display readability by providing constant flicker-free LED output.
The AAT1231's high 2MHz switching frequency provides fast response to load transients and permits the use of small external components including a 2.2uH inductor. The AAT1231 delivers overall efficiency up to 82%.
True Load Disconnect
The AAT1231 also adds a true load disconnect feature which completely isolates the load from the power source. By reducing leakage current to less than 1uA, this function extends battery life and system standby time.
The AAT1231 also offers a wide variety of standard protection features, including integrated soft-start, current limit, over-temperature, and over-voltage protection.
Price and Availability
Specified over the -40°C to +85°C temperature range, the AAT1231 is immediately available in a Pb-free, 12-pin TSOPJW package. The device sells for $0.94 each in 1000-piece quantities.
About AnalogicTech
Advanced Analogic Technologies Incorporated (AnalogicTech) is a supplier of Total Power Management(TM) semiconductor solutions for mobile consumer electronic devices, such as wireless handsets, notebook and tablet computers, smartphones, digital cameras, wireless LAN, and personal media players. The company focuses its design and marketing efforts on the application-specific power management needs of consumer, communications, and computing applications in these rapidly evolving devices. AnalogicTech also develops and licenses device, process, package, and application-related technology. AnalogicTech is headquartered in Sunnyvale, California, with offices in South Korea, Taiwan, Hong Kong, Macau, Shanghai, Shenzhen, Beijing, Japan, Sweden, UK, and France, as well as a worldwide network of sales representatives and distributors. The company is listed on the NASDAQ exchange under the ticker symbol AATI. For more information, please visit the AnalogicTech website: www.analogictech.com. (AnalogicTech - G)
Source: Advanced Analogic Technologies Incorporated (AnalogicTech
CONTACT:
Adolfo Garcia
AnalogicTech,
+1-408-737-4600,
agarcia@analogictech.com
Web site: www.analogictech.com/
