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LP2985A-17YEQR Datasheet(PDF) 9 Page - Texas Instruments |
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LP2985A-17YEQR Datasheet(HTML) 9 Page - Texas Instruments |
9 / 15 page LP2985LV 150mA LOW NOISE, LOW DROPOUT REGULATOR WITH SHUTDOWN FOR OUTPUT VOLTAGES <2.3 V SLVS552 − OCTOBER 2004 9 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 APPLICATION INFORMATION capacitors input capacitor (CIN) A minimum value of 1 mF (over the entire operating temperature range) is required at the input of the LP2985LV. In addition, this input capacitor should be located within 1 cm of the input pin and connected to a clean analog ground. There are no Equivalent Series Resistance (ESR) requirements for this capacitor and the capacitance can be increased without limit. output capacitor (COUT) As an advantage over other regulators, the LP2985LV permits the use of low ESR capacitors at the output, including ceramic capacitors that can have an ESR as low as 5 m Ω. Of course, tantalum and film capacitors can also be used if size and cost are not issues. The output capacitor should also be located within 1 cm of the output pin and be returned to a clean analog ground. As with other PNP LDOs, stability conditions require the output capacitor to have a minimum capacitance and an ESR that falls within a certain range. Minimum COUT: 2.2 µF (can be increased without limit to improve transient response stability margin) ESR range: See Figures 1 and 2 Figure 1. 2.2- µF Stable ESR Curves Figure 2. 4.7- µF Stable ESR Curves |
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