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AAT3190ITP-T1 Datasheet(PDF) 8 Page - Advanced Analogic Technologies |
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AAT3190ITP-T1 Datasheet(HTML) 8 Page - Advanced Analogic Technologies |
8 / 16 page AAT3190 Positive/Negative Charge Pump for Voltage Bias 8 3190.2006.01.1.2 Functional Block Diagram Control UVLO Band Gap Ref. - + - + Reference Oscillator Over- Temperature Protection DRVP DRVN FBP REF FBN GND IN EN Functional Description Dual Charge Pump Regulators The AAT3190 provides low-power regulated output voltages from two individual charge pumps. Using a single stage, the first charge pump inverts the supply voltage (V IN) and provides a regulated neg- ative output voltage. The second charge pump dou- bles V IN and provides a regulated positive output voltage. These outputs use external Schottky diodes and capacitor multiplier stages (as many as required) to regulate up to ±25V. A constant switch- ing frequency of 1MHz minimizes the output ripple and capacitor size. Negative Charge Pump During the first half-cycle, the P-channel MOSFET turns on and the flying capacitor C7 charges to V IN minus a diode drop (Figure 1). During the second half-cycle, the P-channel MOSFET turns off and the N-channel MOSFET turns on, level shifting C7. This connects C7 in parallel with the output reser- voir capacitor C10. If the voltage across C10 minus a diode drop is less than the voltage across C7, current flows from C7 to C10 until the diode turns off. |
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