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LT3023EMSE Datasheet(PDF) 10 Page - Linear Technology |
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LT3023EMSE Datasheet(HTML) 10 Page - Linear Technology |
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10 / 16 page  10 LT3023 3023f APPLICATIO S I FOR ATIO Output Capacitance and Transient Response The LT3023 regulator is designed to be stable with a wide range of output capacitors. The ESR of the output capaci- tor affects stability, most notably with small capacitors. A minimum output capacitor of 1 µF with an ESR of 3 Ω or less is recommended to prevent oscilla- tions. The LT3023 is a micropower device and output transient response will be a function of output capaci- tance. Larger values of output capacitance decrease the peak deviations and provide improved transient response for larger load current changes. Bypass capacitors, used to decouple individual components powered by the LT3023, will increase the effective output capacitor value. With larger capacitors used to bypass the reference (for low noise operation), larger values of output capacitors are needed. For 100pF of bypass capacitance, 2.2 µF of output capacitor is recommended. With a 330pF bypass capacitor or larger, a 3.3 µF output capacitor is recom- mended. The shaded region of Figure 2 defines the region over which the LT3023 regulator is stable. The minimum ESR needed is defined by the amount of bypass capaci- tance used, while the maximum ESR is 3 Ω. Extra consideration must be given to the use of ceramic capacitors. Ceramic capacitors are manufactured with a variety of dielectrics, each with different behavior across temperature and applied voltage. The most common dielectrics used are Z5U, Y5V, X5R and X7R. The Z5U and Y5V dielectrics are good for providing high capacitances in a small package, but exhibit strong voltage and tem- perature coefficients as shown in Figures 3 and 4. When used with a 5V regulator, a 10 µF Y5V capacitor can exhibit an effective value as low as 1 µF to 2µF over the operating temperature range. The X5R and X7R dielectrics result in more stable characteristics and are more suitable for use as the output capacitor. The X7R type has better stability across temperature, while the X5R is less expensive and is available in higher values. Figure 2. Stability OUTPUT CAPACITANCE ( µF) 1 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 310 3023 F02 24 5 6 78 9 STABLE REGION CBYP = 330pF CBYP = 100pF CBYP = 0 CBYP > 3300pF Figure 4. Ceramic Capacitor Temperature Characteristics Figure 3. Ceramic Capacitor DC Bias Characteristics TEMPERATURE ( °C) –50 40 20 0 –20 –40 –60 –80 –100 25 75 3023 F04 –25 0 50 100 125 Y5V X5R BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10 µF DC BIAS VOLTAGE (V) 3023 F03 20 0 –20 –40 –60 –80 –100 0 4 8 10 26 12 14 X5R Y5V 16 BOTH CAPACITORS ARE 16V, 1210 CASE SIZE, 10 µF |
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