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AAT3129 Datasheet(PDF) 9 Page - Advanced Analogic Technologies |
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AAT3129 Datasheet(HTML) 9 Page - Advanced Analogic Technologies |
9 / 15 page AAT3129 High Efficiency 1X/1.5X/2X Charge Pump for RGB Color LED Applications 3129.2007.01.1.4 9 Functional Block Diagram Voltage Reference Soft Start 1MHz Oscillator 1X 1.5X 2X Charge Pump AS2Cwire Interface Control C1- C2+ C2- CP ISRC DR DG DB GND EN/SET VIN C1+ Functional Description The AAT3129 is a tri-mode load switch (1X) and high efficiency (1.5X or 2X) charge pump device intended for fashion color LED lighting applications. To maximize power conversion efficiency, an inter- nal sensing circuit monitors the voltage required on the constant current source output and sets the load switch and charge pump modes based on the input battery voltage and the current source output voltage. As the battery discharges over time, the AAT3129 charge pump is enabled when the current source output nears dropout. The charge pump ini- tially starts in 1.5X mode. If the charge pump out- put drops enough for the current source output to become close to dropout, the charge pump will automatically transition to 2X mode. The AAT3129 requires only four external compo- nents: two 1μF ceramic capacitors for the charge pump flying capacitors (C1 and C2), one 1μF ceramic input capacitor (CIN), and one 0.33μF to 1μF ceramic output capacitor (CP). The color and brightness of an RGB color LED is maintained by PWM signals, which are pro- grammed via the AS2Cwire interface. The control block generates three gate drive PWM signals for the N-channel MOSFET switches. Please refer to the interface description and timing in the following section for details. |
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