Product category:
Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LT3498
Edited by the Electronicstalk Editorial
Team on 01 January 2008
Boost chip powers OLED and backlight
Dual-output boost convertor combines a 2.3MHz PWM LED driver with a low-noise OLED driver.
The LT3498 from Linear Technology is a dual-output boost convertor featuring a 2.3MHz PWM LED driver and a low-noise OLED driver The device includes an internal power switch and Schottky diode for each channel, all in 2 x 3mm DFN package
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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The LT3498's wide 2.5 to 12V input voltage range enables it to operate from single cell Li-ion batteries up to fixed 12V input rails, delivering outputs up to 32V.
Each of the convertors can be independently dimmed or shut down.
From a single-cell Li-ion input, the LED driver channel can drive up to six series 20mA white LEDs while the OLED driver can deliver up to 24mA to a 16V output.
This highly integrated power solution is ideal for dual display electronic devices.
The LT3498's LED driver uses a 2.3MHz PWM frequency, keeping switching noise out of critical wireless and audio bands.
The device also uses a high side current sense topology, providing a one-wire current source for the LED driver.
Similarly, the OLED driver uses a unique control scheme that delivers both high efficiency and low output ripple over a wide load current range.
This technique guarantees that the switching frequency stays above the audio band for the entire load range, making it ideal for noise-sensitive applications such as MP3 players and cellular phones.
Additional features include open LED protection and OLED output disconnect.
The LT3498EDDB is available from stock in a 12-lead 2 x 3mm DFN package.
Pricing starts at US $1.95 each for 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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