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

Features

1. Adjustable Outputs
 (1) Up to +5.5V Main High-Power Output
 (2) Up to +35V Positive Charge-Pump Output
 (3) Down to -35V Negative Charge-Pump Output

2. 200kHz to 2MHz Adjustable Switching Frequency
3. +2.7V to +4.5V Input Supply
4. Internal Power MOSFETs
5. 0.1µA Shutdown Current
6. Internal Soft-Start
7. Power-Ready Output
8. Internal Supply Sequencing
9. Fast Transient Response
10. Ultra-Thin Solution (No Inductors)
11. Thin TSSOP Package (1.1mm max)