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LTM4612 Datasheet(PDF) 11 Page - Linear Technology |
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LTM4612 Datasheet(HTML) 11 Page - Linear Technology |
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11 / 20 page  LTM8048 11 8048fa APPLICATIONS INFORMATION For most applications, the design process is straight forward, summarized as follows: 1. Look at Table 1a (or Table 1b, if the post linear regula- tor is used) and find the row that has the desired input range and output voltage. 2. Apply the recommended CIN, COUT1, COUT2, RADJ1, RADJ2 and CBYP if required. 3. Connect BIAS as indicated, or tie to an external source up to 15V or VIN, whichever is less. While these component combinations have been tested for proper operation, it is incumbent upon the user to verify proper operation over the intended system’s line, load and environmental conditions. Bear in mind that the maximum output current may be limited by junction temperature, the relationship between the input and output voltage magnitude and polarity and other factors. Please refer to the graphs in the Typical Performance Characteristics section for guidance. Capacitor Selection Considerations The CIN, COUT1 and COUT2 capacitor values in Table 1 are the minimum recommended values for the associated op- erating conditions. Applying capacitor values below those indicated in Table 1 is not recommended, and may result in undesirable operation. Using larger values is generally acceptable, and can yield improved dynamic response, if it is necessary. Again, it is incumbent upon the user to verify proper operation over the intended system’s line, load and environmental conditions. Ceramic capacitors are small, robust and have very low ESR. However, not all ceramic capacitors are suitable. X5R and X7R types are stable over temperature and ap- plied voltage and give dependable service. Other types, including Y5V and Z5U have very large temperature and voltage coefficients of capacitance. In an application cir- cuit they may have only a small fraction of their nominal capacitance resulting in much higher output voltage ripple than expected. A final precaution regarding ceramic capacitors concerns the maximum input voltage rating of the LTM8048. A ceramic input capacitor combined with trace or cable inductance forms a high-Q (underdamped) tank circuit. If the LTM8048 circuit is plugged into a live supply, the input voltage can ring to much higher than its nominal value, possibly exceeding the device’s rating. This situation is easily avoided; see the Hot-Plugging Safely section. LTM8048 Table 1a. Recommended Component Values and Configuration for Specific VOUT1 Voltages (TA = 25°C) VIN VOUT1 VBIAS CIN COUT1 RADJ1 3.1V to 32V 2.5V 3.1V to 15V or Open 2.2μF, 50V, 1206 100μF, 6.3V, 1210 12.4k 3.1V to 32V 3.3V 3.1V to 15V or Open 2.2μF, 50V, 1206 100μF, 6.3V, 1210 10k 3.1V to 29V 5V 3.1V to 15V or Open 2.2μF, 50V, 1206 22μF, 16V, 1210 7.15k 3.1V to 26V 8V 3.1V to 15V or Open 2.2μF, 50V, 1206 22μF, 10V, 1206 4.53k 3.1V to 24V 12V 3.1V to 15V or Open 2.2μF, 25V, 0805 10μF, 16V, 1210 3.16k 9V to 15V 2.5V VIN 2.2μF, 50V, 1206 100μF, 6.3V, 1210 12.4k 9V to 15V 3.3V VIN 2.2μF, 50V, 1206 47μF, 6.3V, 1210 10k 9V to 15V 5V VIN 2.2μF, 50V, 1206 22μF, 16V, 1210 7.15k 9V to 15V 8V VIN 2.2μF, 50V, 1206 22μF, 10V, 1206 4.53k 9V to 15V 12V VIN 2.2μF, 25V, 0805 10μF, 16V, 1210 3.16k 18V to 32V 2.5V 3.1V to 15V or Open 2.2μF, 50V, 1206 100μF, 6.3V, 1210 12.4k 18V to 32V 3.3V 3.1V to 15V or Open 2.2μF, 50V, 1206 47μF, 6.3V, 1210 10k 18V to 29V 5V 3.1V to 15V or Open 2.2μF, 50V, 1206 22μF, 16V, 1210 7.15k 18V to 26V 8V 3.1V to 15V or Open 2.2μF, 50V, 1206 22μF, 10V, 1206 4.53k 18V to 24V 12V 3.1V to 15V or Open 2.2μF, 50V, 1206 10μF, 16V, 1210 3.16k Note: Do not allow BIAS to exceed VIN, a bulk input capacitor is required. |
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