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LT3467 Datasheet(PDF) 7 Page - Linear Technology |
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LT3467 Datasheet(HTML) 7 Page - Linear Technology |
7 / 18 page LT3467/LT3467A 7 3467afe APPLICATIONS INFORMATION GND VIN SW SS FB VIN 2.6V TO 4.2V D1 L1 2.7μH R1 402k LT3467 3467 TA05a C2 15μF C4 3.3pF C1 4.7μF R2 133k VOUT 5V 765mA AT VIN = 4.2V, 540mA AT VIN = 3.3V, 360mA AT VIN = 2.6V C1, C2: X5R OR X7R, 6.3V D1: ON SEMICONDUCTOR MBRM120 L1: SUMIDA CR43-2R7 SHDN OFF ON C3 0.047μF Figure 2. Single Li-Ion Cell to 5V Boost Converter (Same as 1st Page Application) Table 1. Inductor Manufacturers Sumida (847) 956-0666 www.sumida.com TDK (847) 803-6100 www.tdk.com Murata (714) 852-2001 www.murata.com FDK (408) 432-8331 www.fdk.co.jp Soft-Start The soft-start feature provides a way to limit the inrush current drawn from the supply upon start-up. An internal 250k resistor charges the external soft-start capacitor to 1.255V. After the capacitor reaches 0.15V the rate of voltage rise at the output of the comparator A1 tracks the rate of voltage rise of the soft-start capacitor. This limits the inrush current drawn from the supply during start- up. The soft-start feature plays another important role in applications where the switch will reach levels of 30V or higher. During start-up, excessively high switch current, together with the presence of high voltage can overstress the switch. A properly used soft-start feature will keep the switch current from overshooting. This practice will greatly improve the robustness of such designs. Once the part is shut down, the soft-start capacitor is quickly discharged to 0.4V, then slowly discharged through the 250k resistor to ground. If the part is to be shut down and re-enabled in a short period of time while soft-start is used, you must ensure that the soft-start capacitor has enough time to discharge before re-enabling the part. Typical values of the soft-start capacitor range from 10nF to 200nF. Supply Current of Figure 2 During Start-Up Without Soft-Start Capacitor VOUT 1V/DIV ISUPPLY 0.5A/DIV 0.1ms/DIV 3467 AI01 Supply Current of Figure 2 During Start-Up with a 47nF Soft-Start Capacitor VOUT 1V/DIV ISUPPLY 0.5A/DIV 0.5ms/DIV 3467 AI02 |
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