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LD39150PU33R Datasheet(PDF) 11 Page - STMicroelectronics |
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LD39150PU33R Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 19 page LD39150 Application notes 11/19 7 Application notes 7.1 External capacitors The LD39150 requires external capacitors for regulator stability. These capacitors must be selected to meet the requirements of minimum capacitance and equivalent series resistance (see Figure 15. Figure 16.). The input/output capacitors must be located less than 1cm from the relative pins and connected directly to the input/output ground pins using traces which have no other currents flowing through them. Any good quality of Ceramic or Electrolytic capacitors can be used. 7.2 Input capacitor An input capacitor whose minimum value is 1µF is required with the LD39150 (amount of capacitance can be increased without limit). This capacitor must be located a distance of not more than 1cm from the input pin of the device and returned to a clean analog ground. Any good quality ceramic, tantalum or film capacitors can be used for this capacitor. 7.3 Output capacitor It is possible to use Ceramic or Tantalum capacitors but the output capacitor must meet the requirement for minimum amount of capacitance and E.S.R. (equivalent series resistance) value. A minimum capacitance of 2.2µF is a good choice to guarantee the stability of the regulator. Anyway, other CO values can be used according to the (Figure 15. Figure 16.) showing the allowable ESR range as a function of the output capacitance. This curve represents the stability region over the full temperature and IO range. 7.4 Thermal note The output capacitor must maintain its ESR in the stable region over the full operating temperature range to assure stability. Also, capacitors tolerance and variation with temperature must be kept in consideration in order to assure the minimum amount of capacitance at all times. 7.5 Inhibit input operation The inhibit pin can be used to turn OFF the regulator when pulled down, so drastically reducing the current consumption down to less than 1µA. When the inhibit feature is not used, this pin must be tied to VI to keep the regulator output ON at all times. To assure proper operation, the signal source used to drive the inhibit pin must be able to swing above and below the specified thresholds listed in the electrical characteristics section (VIH VIL). The inhibit pin must not be left floating because it is not internally pulled down/up. |
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