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MAX8728

Maxim
Part Number MAX8728
Manufacturer Maxim
Description Low-Cost - Multiple-Output Power Supply
Published Apr 21, 2010
Detailed Description 19-3910; Rev 0; 1/06 www.DataSheet4U.com Low-Cost, Multiple-Output Power Supply for LCD Monitors/TVs General Descripti...
Datasheet PDF File MAX8728 PDF File

MAX8728
MAX8728

Overview
19-3910; Rev 0; 1/06 www.
DataSheet4U.
com Low-Cost, Multiple-Output Power Supply for LCD Monitors/TVs General Description The MAX8728 generates all the 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 dualmode, logic-controlled high-voltage switch control block.
The MAX8728 can operate from input voltages from 7V to 13.
2V and is optimized for LCD TV panel and LCD monitor applications running directly from 12V supplies.
The step-up and step-down regulators feature internal power MOSFETs and high-frequency operation allowing 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 MAX8728 is available in a small (5mm x 5mm), lowprofile (0.
8mm), 32-pin TQFN package and operates over the -40°C to +85°C temperature range.
♦ ♦ ♦ ♦ Features Optimized for 10.
8V to 13.
2V Input Supply 7V to 13.
2V Input Supply Range Selectable Frequency (500kHz/1MHz/1.
5MHz) Current-Mode Step-Down Regulator 14V Internal n-Channel MOSFET 1.
5% Accurate Output Current-Mode Step-Up Regulator 19V Internal n-Channel MOSFET 1% Accurate Output True Shutdown™ (Output Goes to Zero) 180° Out-of-Phase Switching Adjustable Positive/Negative Charge Pumps Soft-Start and Timer Delay Fault Latch for All Outputs Logic-Controlled, High-Voltage Switches Power-Up and Power-Down Sequences Thermal-Overload Protection MAX8728 ♦ ♦ ♦ ♦ ♦ ♦ ♦ Applications LCD Monitors LCD TVs Simplified Operating Circuit VIN AVDD Ordering Information VL PART TEMP RANGE PINPACKAGE PACKAGE CODE T3255-4 OUT1 VL INL GATE LX2 GND2 FB2 COMP 32 TQFN-EP* MAX8728...


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