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LTM4613 Datasheet(PDF) 12 Page - Linear Technology |
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LTM4613 Datasheet(HTML) 12 Page - Linear Technology |
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12 / 20 page  LTM8048 12 8048fa LTM8048 Table 1b. Recommended Component Values and Configuration for Specific VOUT2 Voltages (TA = 25°C) VIN VOUT1 VOUT2 VBIAS CIN COUT1 COUT2 RADJ1 RADJ2 3.1V to 32V 1.71V 1.2V 3.1V to 15V or Open 2.2μF, 50V, 1206 100μF, 6.3V, 1210 10μF, 6.3V, 1206 16.5k Open 3.1V to 32V 2.02V 1.5V 3.1V to 15V or Open 2.2μF, 50V, 1206 100μF, 6.3V, 1210 10μF, 6.3V, 1206 14.7k 2.32M 3.1V to 32V 2.34V 1.8V 3.1V to 15V or Open 2.2μF, 50V, 1206 100μF, 6.3V, 1210 10μF, 6.3V, 1206 13.3k 1.07M 3.1V to 32V 3.08V 2.5V 3.1V to 15V or Open 2.2μF, 50V, 1206 100μF, 6.3V, 1210 10μF, 6.3V, 1206 10.5k 487k 3.1V to 32V 3.92V 3.3V 3.1V to 15V or Open 2.2μF, 50V, 1206 47μF, 6.3V, 1210 10μF, 6.3V, 1206 8.66k 294k 3.1V to 29V 5.7V 5V 3.1V to 15V or Open 2.2μF, 50V, 1206 22μF, 16V, 1210 10μF, 6.3V, 1206 6.19k 162k 3.1V to 26V 8.85V 8V 3.1V to 15V or Open 2.2μF, 50V, 1206 22μF, 10V, 1206 10μF, 10V, 1206 4.12k 88.7k 3.1V to 21V 13V 12V 3.1V to 15V or Open 2.2μF, 25V, 0805 10μF, 16V, 1210 10μF, 16V, 1206 2.94k 56.2k 9V to 15V 1.71V 1.2V VIN 2.2μF, 50V, 1206 100μF, 6.3V, 1210 10μF, 6.3V, 1206 16.5k Open 9V to 15V 2.02V 1.5V VIN 2.2μF, 50V, 1206 100μF, 6.3V, 1210 10μF, 6.3V, 1206 14.7k 2.32M 9V to 15V 2.34V 1.8V VIN 2.2μF, 50V, 1206 100μF, 6.3V, 1210 10μF, 6.3V, 1206 13.3k 1.07M 9V to 15V 3.08V 2.5V VIN 2.2μF, 50V, 1206 100μF, 6.3V, 1210 10μF, 6.3V, 1206 10.5k 487k 9V to 15V 3.92V 3.3V VIN 2.2μF, 50V, 1206 47μF, 6.3V, 1210 10μF, 6.3V, 1206 8.66k 294k 9V to 15V 5.7V 5V VIN 2.2μF, 50V, 1206 22μF, 16V, 1210 10μF, 6.3V, 1206 6.19k 162k 9V to 15V 8.85V 8V VIN 2.2μF, 50V, 1206 22μF, 10V, 1206 10μF, 10V, 1206 4.12k 88.7k 9V to 15V 13V 12V VIN 2.2μF, 25V, 0805 10μF, 16V, 1210 10μF, 16V, 1206 2.94k 56.2k 18V to 32V 1.71V 1.2V 3.1V to 15V or Open 2.2μF, 50V, 1206 100μF, 6.3V, 1210 10μF, 6.3V, 1206 16.5k Open 18V to 32V 2.02V 1.5V 3.1V to 15V or Open 2.2μF, 50V, 1206 100μF, 6.3V, 1210 10μF, 6.3V, 1206 14.7k 2.32M 18V to 32V 2.34V 1.8V 3.1V to 15V or Open 2.2μF, 50V, 1206 100μF, 6.3V, 1210 10μF, 6.3V, 1206 13.3k 1.07M 18V to 32V 3.08V 2.5V 3.1V to 15V or Open 2.2μF, 50V, 1206 100μF, 6.3V, 1210 10μF, 6.3V, 1206 10.5k 487k 18V to 32V 3.92V 3.3V 3.1V to 15V or Open 2.2μF, 50V, 1206 47μF, 6.3V, 1210 10μF, 6.3V, 1206 8.66k 294k 18V to 29V 5.7V 5V 3.1V to 15V or Open 2.2μF, 50V, 1206 22μF, 16V, 1210 10μF, 6.3V, 1206 6.19k 162k 18V to 26V 8.85V 8V 3.1V to 15V or Open 2.2μF, 50V, 1206 22μF, 10V, 1206 10μF, 10V, 1206 4.12k 88.7k Note: Do not allow BIAS to exceed VIN, a bulk input capacitor is required. APPLICATIONS INFORMATION BIAS Pin Considerations The BIAS pin is the output of an internal linear regulator that powers the LTM8048’s internal circuitry. It is set to 3V and must be decoupled with a low ESR capacitor of at least 4.7μF. The LTM8048 will run properly without apply- ing a voltage to this pin, but will operate more efficiently and dissipate less power if a voltage greater than 3.1V is applied. At low VIN, the LTM8048 will be able to deliver more output current if BIAS is 3.1V or greater. Up to 32V may be applied to this pin, but a high BIAS voltage will cause excessive power dissipation in the internal circuitry. For applications with an input voltage less than 15V, the BIAS pin is typically connected directly to the VIN pin. For input voltages greater than 15V, it is preferred to leave the BIAS pin separate from the VIN pin, either powered from a separate voltage source or left running from the internal regulator. This has the added advantage of keeping the physical size of the BIAS capacitor small. Do not allow BIAS to rise above VIN. Soft-Start For many applications, it is necessary to minimize the inrush current at start-up. The built-in soft-start circuit significantly reduces the start-up current spike and output voltage overshoot by applying a capacitor from SS to GND. When the LTM8048 is enabled, whether from VIN reaching a sufficiently high voltage or RUN being pulled high, the LTM8048 will source approximately 10μA out of the SS pin. As this current gradually charges the capacitor from SS to GND, the LTM8048 will correspondingly increase the power delivered to the output, allowing for a graceful turn-on ramp. |
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