Complete Bias And White Led Power Supplies For Small Tft Displays Integrated Products

The MAX1578 MAX1579 provide four regulated outputs to meet all the voltage requirements for small active- matrix TFT-LCD Displays in handheld devices where minimum external components and high efficiency are required. Each device consists of three advanced Charge Pumps for LCD bias power and a Step-up con- verter for driving up to 8 series white LEDs for back- lighting. The input voltage range is from 2.7V to 5.5V. The Charge Pumps provide fixed +5V, +15V, and -10V for the LCD bias circuits. No external Diodes are need- ed. A high-efficiency, fractional (1.5x/2x) Charge Pump followed by a low-dropout linear Regulator provides +5V to power the source driver. Automatic mode changing achieves the highest conversion efficiency. Two multi- stage, High-Voltage Charge Pumps generate +15V and -10V to provide VON and VOFF, respectively. Utilizing a unique clocking scheme and internal drivers, these Charge Pumps eliminate parasitic charge-current glitch- es and reduce maximum input current, resulting in low electromagnetic emissions. The outputs are sequenced during startup and shutdown. In shutdown, the outputs are discharged to zero. By Maxim Integrated Products
MAX1578 's PackagesMAX1578 's pdf datasheet
MAX1578ETG QFN
MAX1579ETG QFN
MAX1579 QFN

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MAX1578 Pinout, Pinouts
MAX1578 pinout,Pin out
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