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MAX1747 Datasheet

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Description
MFG CO.
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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 independent 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 switching frequency (200kHz to 2MHz) provides fast transient response and allows the use of small low-profile ceramic capacitors.

Features
♦ Adjustable Outputs
   Up to +5.5V Main High-Power Output
   Up to +35V Positive Charge-Pump Output
   Down to -35V Negative Charge-Pump Output
♦ 200kHz to 2MHz Adjustable Switching Frequency
♦ +2.7V to +4.5V Input Supply
♦ Internal Power MOSFETs
♦ 0.1µA Shutdown Current
♦ Internal Soft-Start
♦ Power-Ready Output
♦ Internal Supply Sequencing
♦ Fast Transient Response
♦ Ultra-Thin Solution (No Inductors)
♦ Thin TSSOP Package (1.1mm max)

Applications
   TFT Active-Matrix LCDs
   Passive-Matrix Displays
   Personal Digital Assistants (PDAs)

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