Details

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Parameter	Description	Value
Part Number	Component Identifier	AN6891
Function	Device Functionality	High-Efficiency Buck Converter
Input Voltage Range	Range of Input Voltage for Operation	4.5V to 28V
Output Voltage Range	Range of Output Voltage Adjustable	0.8V to 18V
Output Current	Maximum Continuous Output Current	3A
Switching Frequency	Frequency at Which the Converter Operates	500kHz to 2MHz
Quiescent Current	Current Drawn by the Device in Standby Mode	25μA (Typical)
Efficiency	Typical Efficiency at Rated Load	Up to 95%
Package Type	Physical Enclosure of the Device	QFN-16 (4x4mm)
Operating Temperature Range	Temperature Range for Reliable Operation	-40°C to +125°C
Storage Temperature Range	Temperature Range for Storage	-65°C to +150°C
Protection Features	Built-in Safety Mechanisms	Overcurrent, Overvoltage, Thermal Shutdown

Instructions for Use

1. Power Supply Connection:

   • Connect the input voltage to the VIN pin.
   • Ensure the input voltage is within the specified range (4.5V to 28V).

2. Output Configuration:

   • Set the output voltage using the feedback resistor network connected to the FB pin.
   • Refer to the datasheet for specific resistor values based on desired output voltage.

3. Inductor Selection:

   • Choose an inductor with a value that matches the switching frequency and output current requirements.
   • Ensure the inductor has a saturation current rating higher than the maximum output current.

4. Capacitor Selection:

   • Use input and output capacitors to stabilize the power supply and reduce ripple.
   • Recommended input capacitance: 10μF to 47μF ceramic capacitor.
   • Recommended output capacitance: 10μF to 100μF ceramic capacitor.

5. Thermal Management:

   • Ensure adequate heat dissipation by providing a thermal path from the device to a heatsink or PCB plane.
   • Use thermal vias to connect the exposed pad to a ground plane for better thermal performance.

6. Layout Considerations:

   • Keep the traces between the input capacitor, inductor, and IC as short as possible to minimize parasitic inductance.
   • Place the output capacitor close to the IC to reduce output ripple.

7. Protection Circuits:

   • The AN6891 includes built-in overcurrent, overvoltage, and thermal shutdown protection.
   • No additional external protection circuits are typically required unless specified by the application.

8. Testing and Validation:

   • After assembly, test the converter under various load conditions to ensure stable operation and correct output voltage.
   • Monitor the temperature of the device to ensure it stays within the operating temperature range.

(For reference only)