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MAX1748EUE Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX1748EUE Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 16 page General Description The MAX1748/MAX8726 triple-output DC-DC converters in a low-profile TSSOP package provide the regulated voltages required by active-matrix, thin-film transistor (TFT) liquid-crystal displays (LCDs). One high-power DC-DC converter and two low-power charge pumps convert the +3.3V to +5V input supply voltage into three independent output voltages. The primary 1MHz DC-DC converter generates a boost- ed output voltage (VMAIN) up to 13V using ultra-small inductors and ceramic capacitors. The low-power BiCMOS control circuitry and the low on-resistance (0.35 Ω) of the integrated power MOSFET allows effi- ciency up to 93%. 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. For both the MAX1748 and MAX8726, the supply sequence is VMAIN first, VNEG next, and finally VPOS. The MAX1748 soft-starts each supply as soon as the previous supply finishes. The MAX8726 adds a delay between the startups of VMAIN and VNEG and also between VNEG and VPOS. The MAX1748/MAX8726 are available in the ultra-thin TSSOP package (1.1mm max height). Applications TFT Active-Matrix LCD Displays Passive-Matrix LCD Displays PDAs Digital Still Cameras Camcorders Features ♦ Three Integrated DC-DC Converters ♦ 1MHz Current-Mode PWM Boost Regulator Up to +13V Main High-Power Output ±1% Accuracy High Efficiency (93%) ♦ Dual Charge-Pump Outputs Up to +40V Positive Charge-Pump Output Down to -40V Negative Charge-Pump Output ♦ Internal Supply Sequencing ♦ Internal Power MOSFETs ♦ +2.7V to +5.5V Input Supply ♦ 0.1µA Shutdown Current ♦ 0.6mA Quiescent Current ♦ Internal Soft-Start ♦ Power-Ready Output ♦ Ultra-Small External Components ♦ Thin TSSOP Package (1.1mm max) Triple-Output TFT-LCD DC-DC Converters ________________________________________________________________ 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 MAX8726 TSSOP FB INTG REF IN GND FBP FBN Pin Configuration 19-3430; Rev 0; 10/04 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. EVALUATION KIT AVAILABLE Ordering Information Typical Operating Circuit appears at end of data sheet. PART TEMP RANGE PIN-PACKAGE MAX1748EUE -40°C to +85°C 16 TSSOP MAX8726EUE -40°C to +85°C 16 TSSOP |
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