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MAX1779 - Low-Power Triple-Output TFT LCD DC-DC Converter

General Description

The MAX1779 triple-output DC-DC converter provides highly efficient regulated voltages required by small active matrix, thin-film transistor (TFT) liquid-crystal displays (LCDs).

Key Features

  • o Three Integrated DC-DC Converters o 250kHz Current-Mode PWM Boost Regulator Up to +13V Main High-Power Output ±1% Accuracy High Efficiency (91%) 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 0.5mA Quiescent Current o Internal Soft-Start o Power-Ready Output o Ultra-Small External Components o Thin TSSOP Package (1.1mm max).

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Full PDF Text Transcription (Reference)

The following content is an automatically extracted verbatim text from the original manufacturer datasheet and is provided for reference purposes only.

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19-1795; Rev 0; 11/00 Low-Power Triple-Output TFT LCD DC-DC Converter General Description The MAX1779 triple-output DC-DC converter provides highly efficient regulated voltages required by small active matrix, thin-film transistor (TFT) liquid-crystal displays (LCDs). One high-power DC-DC converter and two low-power charge pumps convert the +2.7V to +5.5V 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 regulated within ±1%. The low-power BiCMOS control circuitry and the low on-resistance (1Ω) of the integrated power MOSFET allows efficiency up to 91%.