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R1172N351B Datasheet(PDF) 8 Page - RICOH electronics devices division |
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R1172N351B Datasheet(HTML) 8 Page - RICOH electronics devices division |
8 / 36 page R1172x 8 TYPICAL APPLICATION (R1172xxx1B/D) C1 R1172x Series VDD VOUT CE GND C2 VOUT TECHNICAL NOTES When using these ICs, consider the following points: Phase Compensation In these ICs, phase compensation is made for securing stable operation even if the load current is varied. For this purpose, use a capacitor C2 with good frequency characteristics and ESR (Equivalent Series Resistance). The recommendation value is as follows. Output Voltage C2 recommendation value Components Recommendation VOUT < 1.0V Tantalum 4.7 µF or more 1.0 < = VOUT < = 3.3V Ceramic 4.7 µF or more Kyocera Murata Murata 4.7 µF (1608) 4.7 µF (1608) 10 µF (1608) Part Number : CM105X5R475M06AB Part Number : GRM188R60J475KE19B Part Number : GRM188B30G106ME46B 3.3V < VOUT Ceramic 4.7 µF or more Kyocera Murata 4.7 µF (thin 2012) 10 µF (2012) Part Number : CT21X5R475M06AB Part Number : GRM21BB30J106K ∗ ∗ PCB Layout Make VDD and GND lines sufficient. If their impedance is high, noise pickup or unstable operation may result. Connect a capacitor C1 with a capacitance value as much as 4.7 µF or more between VDD and GND pin, and as close as possible to the pins. Set external components, especially the output capacitor C2, as close as possible to the ICs, and make wiring as short as possible. If you use a tantalum type capacitor and ESR value of the capacitor is large, output might be unstable. Evaluate your circuit with considering frequency characteristics. Depending on the capacitor size, manufacturer, and part number, the bias characteristics and temperature characteristics are different. Evaluate the circuit with actual using capacitors. |
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