Details

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BUY AN6879 https://www.utsource.net/itm/p/12618633.html

Parameter	Description	Value/Range
Device Type	High-Efficiency Step-Down DC-DC Converter	-
Input Voltage (VIN)	Operating Input Voltage Range	2.7V to 5.5V
Output Voltage (VOUT)	Adjustable Output Voltage	0.8V to VIN - 0.3V
Output Current (IOUT)	Continuous Output Current	Up to 1A
Switching Frequency	Internal Oscillator Frequency	1.2MHz
Quiescent Current	Current Consumption in Active Mode	30μA (typical)
Shutdown Current	Current Consumption in Shutdown Mode	0.1μA (typical)
Operating Temperature	Ambient Operating Temperature Range	-40°C to +85°C
Package	Package Type	SOT-23-6
Protection Features	Short-Circuit Protection, Thermal Shutdown, Overvoltage Protection	-
Control Method	PWM Control with Fixed Frequency	-

Instructions for Use

1. Power Supply Connection:

   • Connect the input voltage (VIN) to the positive terminal of the power supply.
   • Connect the ground (GND) to the negative terminal of the power supply.

2. Output Configuration:

   • Set the output voltage (VOUT) using an external resistor divider network connected to the FB (feedback) pin.
   • The formula to calculate the output voltage is: ( V_ = V_ times left(1 + fracright) ), where ( V_ ) is typically 0.8V.

3. Inductor Selection:

   • Choose an inductor value based on the desired output current and switching frequency.
   • A typical inductor value for this converter is 10μH to 22μH.

4. Capacitor Selection:

   • Use a low ESR ceramic capacitor for the input (CIN) and output (COUT) capacitors.
   • Recommended values are 10μF for CIN and 10μF to 22μF for COUT.

5. Enabling and Disabling:

   • The EN (enable) pin can be used to turn the converter on or off.
   • Apply a high signal (≥1.2V) to the EN pin to enable the converter.
   • Apply a low signal (≤0.4V) to the EN pin to disable the converter.

6. Thermal Management:

   • Ensure adequate heat dissipation by placing the device on a PCB with sufficient copper area or using a heatsink if necessary.

7. Layout Considerations:

   • Keep the traces from VIN to the inductor and from the inductor to GND as short as possible to minimize parasitic inductance and improve efficiency.
   • Place bypass capacitors close to the IC to reduce noise and improve stability.

8. Testing:

   • After assembly, test the output voltage and current under different load conditions to ensure proper operation.
   • Verify that the converter meets the required specifications and operates within the safe operating area.

(For reference only)