Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX4990E
Edited by the Electronicstalk Editorial Team on 23 October 2007
Single-chip inverter in
electroluminescent drive
The MAX4990E is a high-voltage +/-15kV ESD-protected DC/AC convertor for driving electroluminescent lamps.
New from Maxim Integrated Products, the MAX4990E is a high-voltage +/-15kV ESD-protected DC/AC convertor designed for driving electroluminescent (EL) lamps The device uses an inductor-based boost convertor to generate a high 250V peak-peak (maximum) voltage for maximum EL lamp brightness
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
Related stories
Speedy DAC claims dynamic superiority for comms
The MAX5195 is a 14bit 260Msample/s DAC claimed to provide the world's best dynamic performance in spurious-free dynamic range, intermodulation distortion and signal to noise ratio.
Low-power serial ADC runs up to 200Ksample/s
New from Maxim Integrated Products, the MAX1162 serial-interface 16bit A/D convertor connects directly to SPI, QSPI and Microwire devices without additional interface logic.
A high-voltage full-bridge output converts this high voltage to the AC waveform required to drive an EL lamp.
To maximise design flexibility, the MAX4990E provides resistor-adjustable slew-rate control for audible-noise reduction, capacitor-adjustable switching frequencies and multiple options for controlling the output voltage.
This device is ideal for MP3 players, PDAs, smartphones and other applications that require bright, efficient, even backlighting.
The MAX4990E provides multiple customisation features that enable designers to optimise the driver performance of this convertor for specific EL lamps.
It features a proprietary, acoustic-noise-reduction circuit that controls the slew rate of the AC voltage, thus reducing audible noise from an EL lamp.
To allow the determination of optimal values for passive components, the boost-convertor and lamp switching frequencies can be controlled by either an external source, such as a PWM signal, or capacitors.
Additionally, the MAX4990E implements flexible EL lamp-dimming control by letting users set the output voltage through a DC analogue voltage, PWM signal, or resistor connected to earth.
Featuring a wide +2.4 to +5.5V supply-voltage range, the MAX4990E accepts a variety of voltage sources, such as lithium-ion (Li+) batteries and battery chargers.
It also features +/-15kV ESD protection on the EL lamp outputs and a low 100nA shutdown current.
Fully specified over the -40 to +85C extended temperature range, the MAX4990E is available in a tiny 3 x 3mm, 14-pin TDFN package.
Prices start at US $0.99 (1000-up).
• Maxim Integrated Products: contact details and other news
• Email this article to a colleague
• Register for the free Electronicstalk email newsletter
• Electronicstalk Home Page
Search the Pro-Talk network of sites
