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AAT3120ITP-T1 Datasheet(PDF) 11 Page - Advanced Analogic Technologies |
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AAT3120ITP-T1 Datasheet(HTML) 11 Page - Advanced Analogic Technologies |
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11 / 14 page  AAT3120 3-Channel Charge Pump For White LED Applications 3120.2005.11.1.1 11 ESR is an important characteristic to consider when selecting a capacitor. ESR is a resistance internal to a capacitor, which is caused by the leads, inter- nal connections, size or area, material composition, and ambient temperature. Capacitor ESR is typi- cally measured in milliohms for ceramic capacitors and can range to more than several ohms for tan- talum or aluminum electrolytic capacitors. Ceramic Capacitor Materials Ceramic capacitors less than 0.1µF are typically made from NPO or C0G materials. NPO and C0G materials typically have tight tolerance and are sta- ble over temperature. Large capacitor values are typically composed of X7R, X5R, Z5U, or Y5V dielectric materials. Large ceramic capacitors, typ- ically greater than 2.2µF, are often available in low- cost Y5V and Z5U dielectrics, but capacitors greater than 1µF are typically not required for AAT3120 applications. Capacitor area is another contributor to ESR. Capacitors that are physically large will have a lower ESR when compared to an equivalent material smaller capacitor. These larger devices can improve circuit transient response when compared to an equal value capacitor in a smaller package size. Thermal Protection The AAT3120 has a thermal protection circuit that will shut down the internal LDO and charge pump if the die temperature rises above the thermal limit, as is the case during a short circuit of the OUT pin. Charge Pump Compatibility The AAT3120 is pin-compatible with the AAT3113 in TSOPJW-12 packages, with no D4 output. Compared to the AAT3113, the AAT3120 offers an improved overall efficiency, wider operating range, and the ability to drive high-V F type LEDs (up to 4.3V) at full current from a 3V input condition. The AAT3120 is well suited for battery-powered appli- cations using single-cell Lithium-Ion (Li-Ion) batter- ies (4.2V to 2.8V), Lithium Polymer batteries, and 3-series connected dry cells (3.6V). |
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