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MAX1747 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1747 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 13 page For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. General Description The MAX1747 triple charge-pump DC-DC converter provides the regulated voltages required by active matrix thin-film transistor (TFT) liquid-crystal displays (LCDs) in a low-profile TSSOP package. One high- power and two low-power charge pumps convert the +2.7V to +4.5V input supply voltage into three indepen- dent output voltages. The primary high-power charge pump generates an output voltage (VOUT) between 4.5V and 5.5V that is regulated within ±1%. The low-power BiCMOS control circuitry and the low on-resistance (RON) power MOSFETs maximize efficiency. The adjustable switch- ing frequency (200kHz to 2MHz) provides fast transient response and allows the use of small low-profile ceram- ic capacitors. The dual low-power charge pumps independently regu- late one positive output (VPOS) and one negative output (VNEG). These additional outputs use external diode and capacitor multiplier stages (as many stages as required) to regulate output voltages up to +35V and -35V. The constant switching frequency and a proprietary regulation algorithm minimize output ripple and capaci- tor sizes for all three charge pumps. The MAX1747 is available in the ultra-thin TSSOP package (1.1mm max height). Triple Charge-Pump TFT LCD DC-DC Converter ________________________________________________________________ Maxim Integrated Products 1 20 19 18 17 16 15 14 13 1 2 3 4 5 6 7 8 OUT CXP SUPM CXN FB RDY TGND TGND TOP VIEW PGND SUPP DRVP SUPN REF GND IN INTG 12 11 9 10 DRVN SHDN FBN FBP MAX1747 TSSOP Pin Configuration 19-1788; Rev 0; 10/00 Ordering Information PART TEMP. RANGE PIN-PACKAGE MAX1747EUP -40 °C to +85°C 20 TSSOP Features o Adjustable Outputs Up to +5.5V Main High-Power Output Up to +35V Positive Charge-Pump Output Down to -35V Negative Charge-Pump Output o 200kHz to 2MHz Adjustable Switching Frequency o +2.7V to +4.5V Input Supply o Internal Power MOSFETs o 0.1µA Shutdown Current o Internal Soft-Start o Power-Ready Output o Internal Supply Sequencing o Fast Transient Response o Ultra-Thin Solution (No Inductors) o Thin TSSOP Package (1.1mm max) Applications TFT Active-Matrix LCDs Passive-Matrix Displays Personal Digital Assistants (PDAs) IN FB SUPN DRVP FBP PGND DRVN GND TGND MAX1747 SHDN RDY FBN REF INPUT TO µC SUPM MAIN OUTPUT POSITIVE OUTPUT INTG CXP CXN OUT SUPP NEGATIVE OUTPUT Typical Operating Circuit EVALUATION KIT AVAILABLE |
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