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APL5902-27VC Datasheet(PDF) 10 Page - Anpec Electronics Coropration |
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APL5902-27VC Datasheet(HTML) 10 Page - Anpec Electronics Coropration |
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10 / 21 page  Copyright © ANPEC Electronics Corp. Rev. B.2 - May., 2005 APL5901/2 www.anpec.com.tw 10 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 APL5901/2 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 APL5901/2 load-transient response graphs in typi- cal characteristics show the transient response. A step change in the load current from 10mA to 900mA at 10 µs will cause a 20mV transient spike. Larger output capacitor and lower ESR can reduce transient spike. Application Information Capacitor Selection and Regulator Stability The APL5901/2 use at least a 1 µF capacitor on the input, and this capacitor can be Aluminum, Tantalum 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 mini- mum v alue of 4.7 µF and ESR above 0.02Ω is recommended. A larger output capacitor can reduce noise and improve load-transient response, stability, and PSRR. Note that some ceramic dielectrics ex- hibit large capacitance and ESR v ariation with temperature. When using this capacitor, a minimum 10uF or more may be required to ensure the stability at low temperature operation. Use a bypass capaci- tor at BP pin for low output nvise. Increasing the ca- pacitance will slightly decrease the output noise, but increase the start-up time. Load-Transient Considerations Input-Output (Dropout)Voltage Reverse Current Protection The APL5901/2 have an internal reverse protection, it does not need an external schottky diode to connect the regulator input and output. If the output voltage 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 APL5901/2 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 200mA 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 APL5901/2 will keep short circuit current at 200mA . Shutdown/Enable The APL5901/2 have an active high enable function. Force EN high (>1.6V) enables the regulator, EN low (<0.4V) disables the regulator and enter the shutdown mode. In shutdown mode, the quiescent current can reduce below 1uA. The EN pin cannot be floating, a floating EN pin may cause an indeterminate state on the output. If it is no use, connect to VIN for normal operation. |
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