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LP2981-50DBVRG4 Datasheet(PDF) 11 Page - Texas Instruments |
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LP2981-50DBVRG4 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 22 page 11 LP2981-28, LP2981-29, LP2981-30 LP2981-33, LP2981-50, LP2981A-28 LP2981A-29, LP2981A-30, LP2981A-33, LP2981A-50 www.ti.com SLVS521G – JULY 2004 – REVISED AUGUST 2016 Product Folder Links: LP2981-28 LP2981-29 LP2981-30 LP2981-33 LP2981-50 LP2981A-28 LP2981A-29 LP2981A- 30 LP2981A-33 LP2981A-50 Submit Documentation Feedback Copyright © 2004–2016, Texas Instruments Incorporated 8.2.2 Detailed Design Procedure 8.2.2.1 External Capacitors Like any low-dropout regulator, the external capacitors used with the LP2981 must be carefully selected to assure regulator loop stability. 8.2.2.1.1 Input Capacitor (Cin) A minimum value of 1 µF (over the entire operating temperature range) is required at the input of the LP2981. In addition, this input capacitor must be placed within 1 cm of the input pin and connected to a clean analog ground. There is no Equivalent Series Resistance (ESR) requirement for this capacitor, and the capacitance can be increased without limit. A good-quality ceramic or tantalum capacitor can be used. 8.2.2.1.2 Output Capacitor (Cout) As a PNP regulator, the LP2981 requires the output capacitor to meet both a minimum capacitance and ESR value. Required ESR values as a function of load current are provided for various output voltages, load currents, and capacitances (see Figure 5 through Figure 8). • Minimum Cout: 3.3 µF (can be increased without limit to improve transient response stability margin) • ESR range: see Figure 5 through Figure 8 It is critical that both the minimum capacitance and ESR requirement be met over the entire operating temperature range. Depending on the type of capacitor used, both of these parameters can vary significantly with temperature (see Capacitor Characteristics). 8.2.3 Application Curves Figure 5. 5-V/3.3-µF ESR Curves Figure 6. 5-V/10-µF ESR Curves Figure 7. 3-V/3.3-µF ESR Curves Figure 8. 3-V/10-µF ESR Curves |
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