Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX17014
Edited by the Electronicstalk Editorial Team on 08 January 2008
TV power controller steps up and down
The MAX17014 can generate all the supply rails needed for the TFT-LCD panels used in TVs and monitors.
New from Maxim, the MAX17014 is a highly integrated multiple-output power-supply controller for TFT-LCD TVs and monitors The device operates from an 8 to 16.5V input-voltage range, and is optimised for LCD-panel applications that use a 12V supply
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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To save space, cost, and design time, this TFT-LCD solution integrates step-down and step-up regulators; positive and negative charge pumps; two operational amplifiers; and a Dual Mode logic-controlled high-voltage switch-control block.
The integration of these critical components enables the MAX17014 to generate all the supply rails needed for the TFT-LCD panels used in TVs and monitors.
To reduce further total solution size and cost, the step-up and step-down regulators feature internal power MOSFETs and high-frequency operation, thus enabling the use of small inductors and capacitors.
Both switching regulators use fixed-frequency, current-mode control architectures to provide fast load-transient response and easy compensation.
Additionally, they provide soft-start functions to limit inrush current during startup, adjustable power-up timing, and 180 degree out-of-phase operation to minimise input ripple.
Internal switch current limiting and output-fault shutdown protect the step-up and step-down power supplies against fault conditions.
To generate the supply rails for TFT-LCDs, the MAX17014 integrates positive and negative charge-pump regulators that provide TFT gate-driver supply voltages, as well as adjustable output voltages.
An integrated switch-control block allows for the control of the positive TFT gate-driver voltage and power transfer.
This highly integrated device also includes two high-performance operational amplifiers that are designed to drive the LCD backplane (VCOM).
The amplifiers feature a high, +/-150mA output current; fast, 45V/us slew rate; wide, 20MHz bandwidth; and rail-to-rail inputs and outputs.
Available in a small, 7 x 7 x 0.8mm 48-pin TQFN package, the MAX17014 is fully specified over the -40 to +85C extended temperature range.
Prices start at US $4.50 (1000-up).
An evaluation kit that includes recommended external components is available to reduce design time.
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