Product category:
Power Supply ICs and Controllers
News Release from: Zetex | Subject: ZXLB1600
Edited by the Electronicstalk Editorial
Team on 26 February 2003
Boost convertor offers flexible LCD
biasing
A new boost convertor provides an adjustable output voltage up to 28V for STN LCD backplane bias.
Zetex has launched a boost convertor providing an adjustable output voltage up to 28V for STN LCD backplane bias With a generous input voltage range of 1.6 to 5.5V, the ZXLB1600 inductive switching boost convertor supports a variety of battery configurations including dual alkaline and single Li-ion cells
This article was originally published on Electronicstalk on 6 Feb 2002 at 8.00am (UK)
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The output of the boost convertor is regulated by means of either a directly applied PWM control signal, an external DC voltage, or the use of external feedback resistors.
The ZXLB1600 can maintain a typical output current of 10mA at its maximum output voltage, and higher currents at lower voltages for smaller TFT screens.
A highly integrated device, the boost convertor contains one low-side inductor switch and a second high-side supply switch to isolate the inductor from the input in order to provide true electrical isolation for the LCD screen in shutdown mode.
Alternative boost topologies allow current to reach the screen via the inductor when the convertor is disabled.
A high accuracy low battery flag is also incorporated into the ZXLB1600 IC and indicates when the input voltage has fallen to within +/-2% of a preset threshold.
This threshold is set internally, but can be adjusted externally to any voltage within the supply voltage range to accommodate the different battery chemistries.
The flag operates even when the device is disabled.
Able to operate with an efficiency of 85%, the ZXLB1600 boost convertor is characterised by low quiescent and shutdown currents, with maximum ratings of 75 and 5uA, respectively.
The device's MSOP10 packaging and low external component count requirement ensure board space savings are made.
Target applications for the boost convertor include PDAs, mobile phones, digital cameras, notebook and palmtop computers.
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