Product category: Power Supply ICs and Controllers
News Release from: Linear Technology Corp | Subject: LT1942
Edited by the Electronicstalk Editorial Team on 10 March 2005
Regulator powers up TFTs and backlights
The LT1942 is a highly integrated quad switching regulator designed to provide all necessary power supply functions for TFT displays and their required white LED backlighting.
The LT1942 is a highly integrated quad switching regulator designed to provide all necessary power supply functions for TFT displays and their required white LED backlighting The LT1942, packaged in a 4 x 4mm QFN was designed to power 2 to 7in TFT-LCD panels in applications ranging from PDAs to automotive GPS displays
This article was originally published on Electronicstalk on 28 Jul 2004 at 8.00am (UK)
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It operates from an input voltage range of 2.6 to 16V, making it ideal for applications ranging from Li-ion powered handhelds to automotive applications.
Its 1MHz switching frequency provides low noise operation by keeping external components tiny and providing a compact solution footprint and profile.
The TFT supply incorporates two boost and one inverting DC/DC convertors.
The TFT supply output voltages are independently set, unlike charge pump solutions which have several limitations, enabling greater flexibility in TFT-LCD designs.
In order to make the solution as compact as possible, Schottky diodes have been integrated into the device.
Additional features include programmable power sequencing, soft-start, power good and output disconnect.
The LED driver is a boost DC/DC convertor that can be independently controlled.
The LED driver has built-in dimming control for precise control of LED current.
An 8:1 dimming range is achieved by adjusting the control voltage.
The user can elect to drive a single string (six LEDs) or two strings of LEDs (12 LEDs).
An LED ballast circuit is included to precisely match the LED currents if two strings of LEDs are used.
Both soft-start and open LED protection are built into the LED driver.
The LT1942 is available in a 4 x 4mm QFN-24 available from stock.
Pricing starts at $2.75 each for 1000-piece quantities. Request a free brochure from Linear Technology Corp ...
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