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LTM8046 Datasheet(PDF) 10 Page - Linear Technology |
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LTM8046 Datasheet(HTML) 10 Page - Linear Technology |
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10 / 20 page  LTM8046 10 8046fb For more information www.linear.com/LTM8046 applicaTions inForMaTion For most applications, the design process is straight- forward, summarized as follows: 1. Look at Table 1 and find the row that has the desired input range and output voltage. 2. Apply the recommended CIN, COUT and RFB. 3. Connect BIAS as indicated, or tie to an external source up to 15V or VIN, whichever is less. Whilethesecomponentcombinationshavebeentestedfor 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 and COUT capacitor values in Table 1 are the minimum recommended values for the associated oper- ating 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 LTM8046. A ceramic input capacitor combined with trace or cable inductance forms a high-Q (underdamped) tank circuit. If the LTM8046 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. Table 1. Recommended Components and Configuration (TA = 25°C) VIN VOUT CIN COUT RFB 3.2V to 32V 1.8V 1µF, 50V, 0805 X5R 2 × 100µF, 6.3V, 1206 X5R 18.7k 3.2V to 31V 2.5V 1µF, 50V, 0805 X5R 2 × 100µF, 6.3V, 1206 X5R 14.7k 3.2V to 29V 3.3V 1µF, 50V, 0805 X5R 100µF, 6.3V, 1206 X5R 11.8k 3.2V to 26V 5V 1µF, 25V, 0603 X5R 100µF, 6.3V, 1206 X5R 8.45k 3.2V to 20V 8V 1µF, 25V, 0603 X5R 47µF, 10V, 1206 X5R 5.49k 3.2V to 12V 12V 1µF, 25V, 0603 X5R 2 × 10µF, 16V, 1210 X5R 3.83k 3.2V to 25V 2.5V 1µF, 25V, 0603 X5R 2 × 100µF, 6.3V, 1206 X5R 14.7k 3.2V to 25V 3.3V 1µF, 25V, 0603 X5R 100µF, 6.3V, 1206 X5R 11.8k CBIAS = 1µF 10V 0402 X5R BIAS = 3.3V for VIN ≥ 3.3V, VIN for VIN < 3.3V. If BIAS = VIN, the minimum input voltage is 4.3V. |
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