Details

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BUY AS1105WL https://www.utsource.net/itm/p/12596405.html

Parameter	Description	Value
Device Type	High Efficiency Synchronous Step-Down Converter	-
Input Voltage (VIN)	Operating Input Voltage Range	2.7V to 5.5V
Output Voltage (VOUT)	Adjustable Output Voltage	0.8V to 3.6V
Output Current (IOUT)	Continuous Output Current	Up to 2A
Switching Frequency	Internal Fixed Switching Frequency	2MHz
Quiescent Current	Quiescent Current at No Load	40μA
Shutdown Current	Shutdown Current	<1μA
Operating Temperature	Operating Ambient Temperature Range	-40°C to +85°C
Package	Package Type	WLCSP-10 (1.2mm x 1.2mm)

Instructions for Use

1. Input Capacitor (CIN):

   • Place a 1μF ceramic capacitor close to the input pins (VIN and GND) to ensure stable operation.
   • Additional bulk capacitance may be required depending on the input source impedance.

2. Output Capacitor (COUT):

   • Use a 10μF to 22μF ceramic capacitor with low ESR (Equivalent Series Resistance) for stable output regulation.
   • For better transient response, a smaller value (e.g., 4.7μF) can be used in parallel.

3. Inductor (L):

   • Select an inductor with a saturation current rating higher than the maximum output current.
   • A typical value is 1.0μH to 2.2μH, depending on the desired output ripple and efficiency.

4. Feedback Network (FB):

   • The output voltage is set by the feedback network. Connect a resistor divider from VOUT to FB and GND.
   • Use the formula: ( V_ = 0.8V times left(1 + fracright) ) to calculate the resistor values.

5. Enable Pin (EN):

   • The EN pin controls the shutdown and enable functions.
   • Apply a logic high (≥1.2V) to enable the converter.
   • Apply a logic low (≤0.4V) to shut down the converter.

6. Thermal Considerations:

   • Ensure adequate PCB copper area for heat dissipation.
   • Use thermal vias to connect the exposed pad to internal ground planes if possible.

7. Layout Guidelines:

   • Keep the input and output capacitors as close as possible to the device.
   • Minimize trace lengths and loop areas to reduce parasitic inductance and improve performance.
   • Use wide and short traces for power paths to reduce resistance and inductance.

8. Testing and Validation:

   • Verify the output voltage and current using a multimeter and load.
   • Check for stability under different load conditions and input voltages.
   • Monitor the temperature of the device to ensure it remains within safe operating limits.

(For reference only)