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SA57031-30UK Datasheet(PDF) 9 Page - NXP Semiconductors |
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SA57031-30UK Datasheet(HTML) 9 Page - NXP Semiconductors |
9 / 13 page Philips Semiconductors Product data SA57031-XX Micropower 150 mA, low-noise, low dropout linear regulator with on/off 2003 Jun 23 9 APPLICATION INFORMATION The following points have to be kept in mind for good performance while using these devices. Input Capacitor An input capacitor of 2.2 µF is required between the SA57031 input pin and the circuit ground. This capacitor must be located as close as possible to the VI or GND pin (not more than 1 cm away from the pin) and returned to a clean analog ground. Any good quality ceramic, tantalum, or film capacitor will work. Output Capacitor Phase compensation is used for securing stable operation even if the load current varies. For this reason, an output capacitor with good frequency characteristics is needed. Set it as close to the circuit as possible and make the wiring as short as possible. The value of the output capacitance has to be at least 2.2 µF and has to have B-type temperature characteristics. ON/OFF (Chip Enable) Pin The ON/OFF pin must be actively terminated, not floating. If the function is not needed, the pin should be tied to VI to permanently enable the device. Line Impedance of VI and GND The VI and GND lines should be sufficiently wide to minimize impedance. If the impedance of these lines is high, there is a chance to pick up noise or malfunction. SA00632 B2 A1 B1 VO GND CO CI 2.2 µF ON A2 VI SA57031-XX OFF + – DC 2.0 V TO 6.0 V RLOAD V CO = 2.2 mF for VO = 2.5 to 5.0 V CO = 4.7 mF for VO = 1.8 to 2.5 V ON/OFF PIN MUST BE ACTIVELY TERMINATED A Figure 17. Typical application circuit. |
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