Details

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BUY BD9244AFV https://www.utsource.net/itm/p/12610055.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Input Voltage	VIN	-	4.5	-	36	V
Output Voltage	VOUT	Set by external resistors	-	-	-	V
Output Current	IOUT	Continuous	-	4	-	A
Switching Frequency	fSW	Fixed	-	1.2	-	MHz
Quiescent Current	IQ	VIN = 12V, VOUT = 5V	-	0.1	-	mA
Dropout Voltage	VDROPOUT	IOUT = 3A, VIN = 12V	-	0.5	-	V
Efficiency	畏	VIN = 12V, VOUT = 5V, IOUT = 1A	-	90	-	%
Thermal Shutdown	TSD	-	-	160	-	掳C
Protection Features	-	Overcurrent, Overvoltage, Thermal	-	-	-	-

Instructions for BD9244AFV

1. Input Capacitor (CIN):

   • Use a ceramic capacitor with a minimum capacitance of 10 渭F.
   • Place the capacitor as close as possible to the input pins to minimize noise.

2. Output Capacitor (COUT):

   • Use a ceramic or tantalum capacitor with a minimum capacitance of 10 渭F.
   • For better stability, use a capacitor with an ESR (Equivalent Series Resistance) between 0.1 惟 and 10 惟.

3. Feedback Resistor Network:

   • The output voltage is set by the ratio of two resistors (R1 and R2) connected to the FB pin.
   • Use the formula ( V_ = V_ times left(1 + fracright) ), where ( V_ ) is typically 0.8V.

4. Inductor Selection:

   • Choose an inductor with a saturation current higher than the maximum output current.
   • The inductance value should be between 4.7 渭H and 10 渭H for optimal performance.

5. Thermal Management:

   • Ensure adequate heat dissipation by using a heatsink or PCB copper area.
   • The device can operate up to 160掳C, but it is recommended to keep the junction temperature below 125掳C for reliable operation.

6. PCB Layout:

   • Keep the traces from the input capacitor to the IC as short as possible.
   • Use wide traces for power paths to reduce resistance and inductance.
   • Ground planes should be used to improve thermal performance and reduce noise.

7. Protection Circuits:

   • The device includes built-in overcurrent, overvoltage, and thermal protection.
   • No additional external components are required for these protections.

8. Start-up Time:

   • The start-up time is typically less than 1 ms under normal conditions.
   • Ensure that the input voltage rises slowly to avoid inrush currents.

9. Shutdown Function:

   • The device can be shut down by pulling the EN pin low.
   • The shutdown current is typically less than 1 渭A.

10. Stability:

    • The device is stable with a wide range of output capacitors.
    • For critical applications, consult the datasheet for specific stability guidelines.

(For reference only)