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ST2L01PT bảng dữ liệu(PDF) 5 Page - STMicroelectronics |
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ST2L01PT bảng dữ liệu(HTML) 5 Page - STMicroelectronics |
5 / 12 page ST2L01 5/12 APPLICATION HINTS EXTERNAL CAPACITORS Like any low-dropout regulator, the ST2L01 requires external capacitors for stability. We suggest to solder both capacitors as close as possible to the relative pins (1, 2 and 5). INPUT CAPACITORS An input capacitor, whose value is at least 1 µF, is required; the amount of the input capacitance can be increased without limit if a good quality tantalum or aluminum capacitor is used. SMS X7R or Y5V ceramic multilayer capacitors could not ensure stability in any condition because of their variable characteristics with Frequency and Temperature; the use of this capacitor is strictly related to the use of the output capacitors. For more details read the "OUTPUT CAPACITOR SECTION". The input capacitor must be located at a distance of not more than 0.5" from the input pin of the device and returened to a clean analog ground. OUTPUT CAPACITOR The ST2L01 is designed specifically to work with Ceramic and Tantalum capacitros. Special care must be taken when a Ceramic multilayer capacitor is used. Special care must be taken when a Ceramic multilayer capacitor is used. Due to their characteristics they can sometimes have an ESR value lower than the minimum required by the ST2L01 and their relatively large capacitance can change a lot with the ambient temperature. The test results of the ST2L01 stability using multilayer ceramic capacitors show that a minimum value of 1 µF is needed for the adjustable regulator (set to 2.5V). This value can be increased up to 10 µF when a tantalum capacitor is used on the input. A higher value CO can have an ESR lower than the accepted minimum. When a ceramic capacitor is used on the input the output capacitance must be in the range from 1 µF to 2.2 µF if C I=1µF, and from 1µF to 4.7µF if CI=2.2µF. The 3.3V regulator stable with a 470nF capacitor. This value can be increased up to 10 µF if a tantalum capacitor is used on the input. A higher value CO can have an ESR lower than the accepted minimum. When a ceramic capacitor is used in the input the output capacitance must be in the range from 1 µF to 2.2 µF if C I=1µF, and from 1µF to 4.7µF if CI=2.2µF. Surface-mountable solid tantalum capacitors offer a good combination of small physical size for the capacitance value and ESR in the range needed by the ST2L01. The test results show good stability for both outputs with values of at least 1 µF. The value can be increased without limit for even better performance such a transient response and noise. IMPORTANT; The output capacitor must maintain its ESR in the stable region over the full operating temperature to assure stability. Also , capacitor tolerance and variation with temperature must be considered to assure that the minimum amount of capacitance is provided at all times. For this reason, when a ceramic multilayer capacitor is used, the better choise for temperature coefficent is the X7R type, which holds the capacitance within ±15% . The output capacitor should be located not more than 0.5" from the output pins of the device and returned to a clean analog ground. ADJUSTABLE REGULATOR The ST2L01 has a 1.25V reference voltage between the output and the adjustable pins (respectevely pin 4 and 2). When a resistor R2 is placed between these two therminals a constant current flows through R2 and down to R1 to set the overall (VO2 to GND) output voltage. Minimum load current is 1mA. IADJ is very small (typically 35µA) and constant; in the VO calculation it can be ignored. |
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