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LTC1258CS8 Datasheet(PDF) 6 Page - Linear Technology |
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LTC1258CS8 Datasheet(HTML) 6 Page - Linear Technology |
6 / 8 page 6 LTC1258 Series Figure 1. Reference Output Load Transient Response, 1 µF Output Capacitor 1mA IOUT 0mA 1mA IOUT 0mA VOUT 100mV/DIV VOUT 100mV/DIV 0.5ms/DIV 1258 F01b 10ms/DIV 1258 F01a APPLICATIONS INFORMATION Figure 2. Adding a Damping Resistor with Output Capacitors Greater Than 1 µF Longer Battery Life Series references have an advantage over shunt style references. To operate, shunt references require a resistor between the power supply and the output. This resistor must be chosen to supply the maximum current that is demanded by the circuit being regulated. When the circuit being controlled is not operating at this maximum current, the shunt reference must always sink this current, result- ing in high power dissipation and short battery life. The LTC1258 series low dropout references do not require a current setting resistor and can operate with any supply voltage from (VOUT(NOMINAL) + 0.2V) to 12.6V. When the circuitry being regulated does not demand current, the LTC1258 series reduces its dissipation and battery life is extended. If the reference is not delivering load current it dissipates only 10.8 µW when operating on a 2.7V supply for LTC1258-2.5, yet the same connection can deliver 10mA of load current when demanded. Output Bypass Capacitor The LTC1258 series is designed to be stable with or without capacitive loads. With no capacitive load, the reference is ideal for fast settling applications, or where PC board space is at a premium. In applications with significant output loading changes, an output bypass capacitor of up to 1 µF can be used to improve the output transient response. Figure 1 shows the response of the reference to a 1mA to 0 µA load step with a 1 µF output capacitor. If more than 1µF of output capaci- tance is required, a resistor in series with the capacitor is recommended to reduce the output ringing. Figure 2 illustrates the use of a damping resistor for capacitive loads greater than 1 µF. Figure 3 shows the resistor and capacitor values required to achieve critical damping. Figure 3. Damping Resistance vs Output Capacitor Value LTC1258-5 OUT IN GND 4 2 5.2V TO 12.6V 1 5V 1258 F02 0.1 µF COUT >1 µF DAMPING RESISTOR <1k OUTPUT CAPACITOR VALUE ( µF) 1 10 100 1k 10k 10 100 1000 1258 F03 |
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