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AAT3119 Datasheet(PDF) 10 Page - Advanced Analogic Technologies |
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AAT3119 Datasheet(HTML) 10 Page - Advanced Analogic Technologies |
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10 / 16 page  AAT3119 High Efficiency 2X Charge Pump 10 3119.2005.08.1.1 Functional Block Diagram OUT Voltage Reference Soft Start 1MHz Oscillator Charge Pump C1+ C1- GND EN IN Functional Description The AAT3119 is a 5.0V or 4.5V regulated voltage doubling charge pump device intended for general applications that require low noise voltage boost function from input supplies ranging from 2.7V to 5.5V. The charge pump is capable maintaining the regulated voltage output for continuous output cur- rent loads up to 150mA. This makes the AAT3119 ideal for general purpose voltage boost applica- tions, driving white and RGB color LEDs, as well as USB OTG VBUS supplies in portable products. The AAT3119 charge pump and regulation circuit is also capable of supplying peak pulse currents up to 250mA for 500ms. This makes the device suitable for many photo-flash LED applications. The AAT3119 accomplishes the voltage boost func- tion by utilizing a voltage doubling (2X) charge pump. The charge pump block within the device uses low RDS MOSFET switches to transfer charge from the input to output via a flying capacitor (CFLY). This switching process is performed over two phas- es of each clock cycle which is set by the fixed 1.2MHz internal oscillator. On the first phase of each clock cycle, the flying capacitor is placed in parallel with the input (IN) and is charged to the level of the input voltage across CIN. On the second phase of the switching cycle, the flying capacitor is reconfigured by the internal switches and placed in series with the input capacitor. CIN and CFLY are then placed across the output capacitor (COUT). The voltage seen on COUT is then two times that of CIN. The AAT3119 contains an internal reference and feedback system that senses the charge pump output and controls the charge pump function to maintain an accurate regulated output voltage. Because of the fixed 1.2MHz high frequency inter- nal oscillator, the input, output, and flying capaci- tors are very small. This circuit architecture requires only one 1µF ceramic capacitor for the charge pump flying capacitor (CFLY) and one 1µF ceramic capacitor for both CIN and COUT. The AAT3119 has a soft-start circuit to prohibit in- rush current when the device is enabled. This fea- ture guarantees a smooth transition to the desired output voltage when the device is turned on. The system soft-start circuit is particularly useful in white LED backlight applications where the use of a PWM signal is employed as an LED dimming function. In limiting the input inrush current each time the device is turned on, the soft-start circuit helps minimize back-injected switching noise and transient supply current. |
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