Product category: Power Supply ICs and Controllers
News Release from: Maxim Integrated Products | Subject: MAX8728
Edited by the Electronicstalk Editorial Team on 27 February 2006
Power chip goes up and down for full TFT
supply
The MAX8728 power supply generates all the supply rails required by thin-film transistor liquid-crystal display panels in TVs and monitors.
Maxim Integrated Products has released the MAX8728 power supply, which generates all supply rails for thin-film transistor (TFT), liquid-crystal display (LCD) panels in TVs and monitors It includes step-down and step-up regulators, positive and negative charge pumps, and a dual-mode, logic-controlled, high-voltage switch-control block
This article was originally published on Electronicstalk on 27 Aug 2002 at 8.00am (UK)
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The MAX8728 has a 7 to 13.2V input supply voltage, and is optimised for LCD TV panel and LCD monitor applications running directly from 12V supplies.
The MAX8728's step-up and step-down regulators feature internal power MOSFETs and high-frequency operation.
This allows the use of small inductors and capacitors, resulting in a compact solution.
Both switching regulators use fixed-frequency, current-mode control architectures, providing fast load-transient response and easy compensation.
The positive and negative charge-pump regulators provide TFT gate-driver supply voltages.
Both output voltages can be adjusted with external resistive voltage dividers.
The switch-control block allows the manipulation of the positive TFT gate-driver voltage.
Soft-start functions limit inrush current during startup.
An integrated current-limit function for internal switches and output-fault shutdown protects the power supplies against fault conditions.
The MAX8728 also provides adjustable power-up timing.
The MAX8728 is available in a small (5 x 5mm), low-profile (0.8mm), 32-pin TQFN package, and operates over the -40 to +85C temperature range.
Prices start at $4.15 (1000-up, FOB USA).
A preassembled MAX8728 evaluation kit with recommended external components is available to reduce design time.
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