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MAX1748 Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1748 Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 16 page General Description The MAX1748 triple-output DC-DC converter in a low- profile TSSOP package provides the regulated voltages required by active matrix, thin-film transistor (TFT) liquid crystal displays (LCDs). One high-power DC-DC con- verter and two low-power charge pumps convert the +3.3V to +5V input supply voltage into three independent output voltages. The primary high-power DC-DC converter generates a boosted output voltage (VMAIN) up to 13V that is regu- lated within ±1%. The low-power BiCMOS control cir- cuitry and the low on-resistance (0.35 Ω) of the integrated power MOSFET allows efficiency up to 93%. The 1MHz current-mode PWM architecture provides fast transient response and allows the use of ultra-small inductors and ceramic capacitors. The dual charge pumps independently regulate one positive output (VPOS) and one negative output (VNEG). These low-power outputs use external diode and capacitor stages (as many stages as required) to regu- late output voltages up to +40V and down to -40V. A proprietary regulation algorithm minimizes output rip- ple, as well as capacitor sizes for both charge pumps. The MAX1748 is available in the ultra-thin TSSOP pack- age (1.1mm max height). ________________________Applications TFT Active Matrix LCD Displays Passive Matrix LCD Displays PDAs Digital Still Cameras Camcorders Features o Three Integrated DC-DC Converters o 1MHz Current-Mode PWM Boost Regulator Up to +13V Main High-Power Output ±1% Accuracy High Efficiency (93%) o Dual Charge-Pump Outputs Up to +40V Positive Charge-Pump Output Down to -40V Negative Charge-Pump Output o Internal Supply Sequencing o Internal Power MOSFETs o +2.7V to +5.5V Input Supply o 0.1µA Shutdown Current o 0.6mA Quiescent Current o Internal Soft-Start o Power-Ready Output o Ultra-Small External Components o Thin TSSOP Package (1.1mm max) Triple-Output TFT LCD DC-DC Converter ________________________________________________________________ Maxim Integrated Products 1 16 15 14 13 12 11 10 9 1 2 3 4 5 6 7 8 RDY TGND LX PGND SUPP DRVP SUPN DRVN SHDN TOP VIEW MAX1748 TSSOP FB INTG REF IN GND FBP FBN Pin Configuration 19-1740; Rev 0; 6/00 For free samples and the latest literature, visit www.maxim-ic.com or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. Ordering Information Typical Operating Circuit appears at end of data sheet. 16 TSSOP PIN-PACKAGE TEMP. RANGE -40°C to +85°C MAX1748EUE PART |
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