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TS3300ITQ1633 Scheda tecnica(PDF) 9 Page - Silicon Laboratories |
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TS3300ITQ1633 Scheda tecnica(HTML) 9 Page - Silicon Laboratories |
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9 / 12 page  TS3300 TS3300 Rev. 1.0 Page 9 Boost Only Operation For Boost Only operation, please refer to Figure 2 which displays the appropriate circuit configuration. The Anti-Crush feature can be used during Boost Only operation. During Boost Only operation, a shutdown (BEN) pin is available to shutdown the boost regulator. The boost regulator is in shutdown mode when BEN is HIGH. During shutdown, the supply current reduces to 0.1µA. For Boost Only operation, the following pins should be connected to analog ground, REGIN, REGOUT, REGFB, REGEN, and SWEN. How to Set the Boost Output Voltage The output voltage can be set via a voltage divider circuit as shown in Figure 3. The output feedback (BO FB) pin is 505mV. It is recommended to use large resistor values to minimize additional current draw at the output. Resistors values less than 8M Ω are recommended. Using the following equation to solve for R1 for a given R2 value, the output voltage can be set: R1= VBO - 0.505 R2 0.505 To set a 3V output voltage with R2 = 1.37M Ω, R1 is calculated to be 6.77M Ω. A 1% standard resistor value of 6.81M Ω can be selected. This results in an output voltage of 3.02V. APPLICATIONS INFORMATION Inductor Selection A low ESR, shielded 10 μH inductor is recommended for most applications and provides the best compromise between efficiency and size. A low loss ferrite and low dc resistance (DCR) inductor is best for optimal efficiency. Furthermore, there should exist at least an 8% margin between the saturation current of the inductor and the peak inductor current for a given set of operating conditions. Table 2 provides a list of inductor manufactures. Refer to the Inductor Peak Current vs Load Current plot in the “Typical Performance Characteristics” section. This plot shows how the inductor peak current varies with load current with a LPS4018-103ML inductor from Coilcraft. Input and Output Capacitor Selection For the boost regulator, a low ESR ceramic input and output capacitor of at least 10 μF is recommended to be placed as close as possible to the BI and BO pin. Output voltage ripple can be reduced by increasing the value of the output capacitor while providing improved transient response. Ceramic capacitors with X5R or X7R dielectric with a minimum voltage rating of 10V are recommended. Figure 3. Setting the Boost Output Voltage with a Voltage Divider Inductors Supplier Website Coilcraft www.coilcraft.com Murata www.murata.com Sumida www.sumida.com Table 2. Inductor Manufactures Figure 2. Boost Only Circuit Configuration |
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