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APL5151-18B Datasheet(PDF) 11 Page - Anpec Electronics Coropration |
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APL5151-18B Datasheet(HTML) 11 Page - Anpec Electronics Coropration |
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11 / 16 page  Copyright © ANPEC Electronics Corp. Rev. B.4 - May., 2005 APL5151/2/3/4 www.anpec.com.tw 11 The minimum input-output voltage difference (dropout) determines the lowest usable supply voltage. In bat- tery-powered systems, this will determine the useful end-of-life battery voltage. Because the APL5151/2/ 3/4 use a p-channel MOSFET pass transistor, the drop- out voltage is a function of drain-to-source on-resis- tance (R DS(ON)) multiplied by the load current. The APL5151/2/3/4 load-transient response graphs in typical characteristics show the transient response. A step change in the load current from 1mA to 50mA at 1us will cause a 60mV transient spike. Larger out- put capacitor and lower ESR can reduce transient spike. Application Information Capacitor Selection and Regulator Stability The APL5151/2/3/4 use at least a 1uF capacitor on the input, and this capacitor can be Aluminum, Tanta- lum or Ceramic capacitor. The input capacitor with larger value and lower ESR provides better PSRR and line-transient response. The output capacitor also can use Aluminum, Tantalum or Ceramic capacitor, and a minimum value of 1uF and ESR above 0.06 Ω is recommended. The curve of the stable region in typi- cal characteristics shows the appropriate output ca- pacitor ESR for different load current stable operation. A larger output capacitor can reduce noise and im- prove load-transient response, stability, and PSRR. Note that some ceramic dielectrics exhibit large ca- pacitance and ESR variation with temperature. When using this capacitor, a minimum 2.2uF or more may be required to ensure the stability at low temperature operation. Use a bypass capacitor at BP pin for low output nvise. Increasing the capacitance will slightly decrease the output noise, but increase the start-up time. (See Shutdown Exit Delay and Output Noise v s. B y pass Capac i t or gr a ph i n t he t y p i c al characteristics) Load-Transient Considerations Input-Output (Dropout)Voltage Reverse Current Protection The APL5151/2/3/4 have an internal reverse protection, it does not need an external schottky diode to con- nect the regulator input and output. If the output volt- age is forced above the input voltage by more than 11mV, the IC will be shutdown and the ground pin current is below 0.1uA. Current Limit The APL5151/2/3/4 have a current limit protection. The ouptut voltage will drop close to zero volt, when load current reaches the limit, and then the load current will be limited at 50mA after output voltage is below 0. 7V. When the load current back to the value where limiting started, the output voltage and current will re- turn to normal value. When output is shorted to ground, the APL5151/2/3/4 will keep short circuit cur- rent at 150mA . |
Similar Part No. - APL5151-18B |
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Similar Description - APL5151-18B |
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