Datenblatt-Suchmaschine für elektronische Bauteile |
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AAT3171 Datenblatt(PDF) 8 Page - Advanced Analogic Technologies |
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AAT3171 Datenblatt(HTML) 8 Page - Advanced Analogic Technologies |
8 / 19 page AAT3171 High Current, High Efficiency Charge Pump with Auto-Timer 8 3171.2007.03.1.1 Functional Block Diagram Charge Pump Section 1 Charge Pump Section 2 1MHz Oscillator Soft-Start Control C1+ C1- C2+ C2- OUT FL RSET GND EN/SET VIN System Control; S2Cwire; Timing CT Functional Description The AAT3171 is a high efficiency, low noise, dual stage tri-mode 1X/1.5X/2X charge pump device intended for photo-flash LED applications. The device requires only four external components: two ceramic capacitors for the charge pump flying capacitors, one ceramic capacitor for CIN, and one ceramic capacitor for COUT. The charge pump is designed to deliver regulated load currents up to 800mA. The dual stage charge pump section contains soft-start circuitry to pro- hibit excessive inrush current during start-up. System efficiency is maximized with a tri-mode, dual stage charge pump topology. The internal clock oscillator at 1MHz allows the use of small external components. The tri-mode charge pump operation further opti- mizes power conversion efficiency. Depending upon the variance of load current (at different modes), input voltage, and nominal LED forward voltage, the charge pump will operate in a 1X, 1.5X, or 2X mode to generate the output voltage required to power the load for a given controlled constant current. This results in significant power savings over voltage doubling architectures, especially when the LEDs are also operated at lower current levels in movie, viewing, or flashlight modes. S2Cwire Serial Interface The AAT3171 utilizes Analogic Tech's single wire S2Cwire interface to enable/disable the charge pump and adjust the output current at 16 current levels. Each code defines the output current to be a percentage of the maximum current set by the resistor at the RSET pin (see Table 1). |
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