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LM3350 データシート(PDF) 4 Page - National Semiconductor (TI) |
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LM3350 データシート(HTML) 4 Page - National Semiconductor (TI) |
4 / 8 page Typical Performance Characteristics (Continued) Pin Description Pin Name Function 1 Cap1+ Positive terminal for the first charge pump capacitor. 2 Cap1− Negative terminal for the first charge pump capacitor. 3 Cap2+ Positive terminal for the second charge pump capacitor. 4 Cap2− Negative terminal for the second charge pump capacitor. 5V low In Step-Up mode, this will be the input terminal. In Step-Down mode, this will be the output terminal. 6 Gnd Ground 7V high In Step-Down mode, this will be the input terminal. In Step-Up mode, this will be the output terminal. 8 Enable Active high CMOS logic level Enable Input. Connect to Voltage Input terminal to enable the IC. Connect to Ground (Pin 6) to disable. Detailed Operation OPERATING PRINCIPLE The LM3350 is a charge-pump voltage converter that pro- vides a voltage conversion ratio of 3/2 in step-up mode and a conversion ratio of 2/3 in the step-down mode. Thus it can be used in the step-down mode to provide a 3.3V output from a regulated 5V input or in the step-up mode to provide a 5V output from a regulated 3.3V input. Other values of in- put voltages can be used as long as they are within the lim- its. The LM3350 contains an array of CMOS switches which are operated in a certain sequence to provide the step-up or step-down of the input supply. An internal RC oscillator pro- vides the timing signals. Energy transfer and storage are provided by four inexpen- sive ceramic capacitors. The selection of these capacitors is explained in the Capacitor Selection section under Applica- tion Information. V out vs Iload (Step-Down) DS100002-5 Pη vs Iload (Step-Down) DS100002-7 Output Source Impedance vs Temperature (Step-Down) DS100002-8 Switching Frequency vs Temperature DS100002-10 www.national.com 4 |
同様の部品番号 - LM3350 |
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同様の説明 - LM3350 |
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