AAT3190IKS-T1

DATA SHEET AAT3190 Positive/Negative Charge Pump for Voltage Bias General Description Features The AAT3190 charge pump controller provides the regulated positive and negative voltage biases required by active matrix thin-film transistor (TFT) liquid-crystal displays (LCDs), charge-coupled device (CCD) sensors, and organic light emitting diodes (OLEDs). Two low-power charge pumps convert input supply voltages ranging from 2.7V to 5.5V into two independent output voltages. • • • • • • • • • • • • • The dual low-power charge pumps independently regulate a positive (VPOS) and negative (VNEG) output voltage. These outputs use external diode and capacitor multiplier stages (as many stages as required) to regulate output voltages up to ±25V. Built-in soft-start circuitry prevents excessive in-rush current during start-up. A high switching frequency enables the use of small external capacitors. The device’s shutdown feature disconnects the load from VIN and reduces quiescent current to less than 1.0μA. VIN Range: 2.7V to 5.5V Adjustable ± Dual Charge Pump Positive Supply Output Up to +25V Negative Supply Output Down to -25V Up to 30mA Output Current 1.0MHz Switching Frequency