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ISL6414 Datasheet(PDF) 11 Page - Intersil Corporation |
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ISL6414 Datasheet(HTML) 11 Page - Intersil Corporation |
11 / 12 page 11 50m Ω or less to insure stability and optimum transient response. For stable operation, a ceramic capacitor whose value is minimum 3.3µF is recommended for VOUT1 for 300mA output current and 2.2µF is recommended for VOUT2 and VOUT3 each at 200mA load current. There is no upper limit to the output capacitor value. Larger capacitor can reduce noise and improve load transient response, stability and PSRR. The output capacitor should be located very close to VOUT pins to minimize impact of PC board inductances and should be returned to a clean analog ground. Input-Output (Dropout) Voltage A regulator’s minimum input-output voltage differential (or dropout voltage) determines the lowest usable supply voltage. In battery-powered systems, this determines the useful end- of-life battery voltage. Because the ISL6414 uses a P-channel MOSFET pass transistor, its dropout voltage is a function of rDS(ON) (typically 0.5) multiplied by the load current. Noise, PSSR and Transient Response The ISL6414 is designed to operate with low dropout voltages and low quiescent current while still maintaining good noise, transient response, and AC rejection. When operating from noisy sources, improved supply-noise rejection and transient response can be achieved by increasing the values of the input and output bypass capacitors and through passive filtering techniques. The ISL6414 load transient response graph is presented in application note AN1080. Increasing the output capacitor value and decreasing the ESR attenuates the overshoot. ISL6414 |
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