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== Power Supply == The supply voltage of model is 3.3V, required current is 200mA, peak current for special case is up to 1A <font color=red>Rated current of the power supply must be more than 600mA. Insufficient current will cause chip unstable, most oftenly reboot with no reason</font> Recommend adding 220uF / 470uF capacitor to power output side in response to 1A peak current of the chip DC-DC chip, recommend AP2112 (5V switch 3.3V,compact size) / AMS1117-3.3 (12V-5V switch 3.3V,high current) / WL2803G === AMS1117-3.3 === ;;Feature: * 1000mA LDO * Dropout voltage : 1.1V @ Iout = 800mA load current * The quiescent current is typically 5mA * Vin MAX = 15V * SOT-223-3L package [[文件:AMS1117-pin.png]] <br><br> === WL2803G === Replace AMS1117 to fit low dropout voltage situation ;;Feature: * 1000mA CMOS LDO * Dropout voltage : 260mV @ Iout = 800mA load current * The quiescent current is typically 150uA * Vin MAX = 6.5V * SOT-223-3L package * Output 3.3V is marking 2803G**/YYWW [ ** - Voltage code (33: 3.3V), YY - Year code, WW - Week code ] [[文件:Wl2803g-pin-app.png]] <br><br> === AP2112 === ;;Feature: * 600mA CMOS LDO * Low Dropout Voltage (3.3V): 250mV (Typ.) @ 600mA * Low Quiescent Current: 55μA (Typ.) * Low Standby Current: 0.01μA (Typ.) * Vin MAX = 6.5V * Provides SOT-23-5, SOT-89-5, and SOIC-8 packages [[文件:AP2112-pin-app.png]] <br><br> === MP1470 === Wide input voltage recommend to use MP1470 * Wide 4.7V-to-16V Operating Input Range * Fixed 500kHz Switching Frequency * Over-Current Protection and Hiccup * Thermal Shutdown * Output Adjustable from 0.8V * Available in a 6-pin TSOT-23 package [[文件:Mp1470-typical.jpg]] <br><br>
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