Details

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BUY CS49834A-CQZ https://www.utsource.net/itm/p/12612100.html

Parameter	Description	Value	Unit
Device Type	High Efficiency, Synchronous Step-Down DC/DC Converter	-	-
Input Voltage Range	Minimum Input Voltage	2.7	V
	Maximum Input Voltage	5.5	V
Output Voltage Range	Adjustable Output Voltage	0.6 to VIN	V
Switching Frequency	Fixed Switching Frequency	1.0	MHz
Output Current	Continuous Output Current	3.0	A
Quiescent Current	Operating Quiescent Current	20	渭A
Shutdown Current	Shutdown Mode Current	0.1	渭A
Efficiency	Typical Efficiency at 3.3V In, 1.8V Out, 1A Load	95	%
Operating Temperature Range	Minimum Operating Temperature	-40	掳C
	Maximum Operating Temperature	125	掳C
Package Type	Package	QFN-16	-
Pin Pitch	Pin Pitch	0.5	mm
Package Size	Package Size	3x3	mm

Instructions for Use:

1. Input Capacitor Selection:

   • Place a low ESR ceramic capacitor (10 渭F or higher) as close as possible to the input pins.
   • Additional bulk capacitance may be required for stability and noise reduction.

2. Output Capacitor Selection:

   • Use a low ESR ceramic capacitor (10 渭F or higher) for output filtering.
   • Ensure the capacitor has a ripple current rating suitable for the expected load.

3. Inductor Selection:

   • Choose an inductor with a saturation current rating higher than the maximum output current.
   • Typical inductance values range from 1.0 渭H to 4.7 渭H, depending on the application requirements.

4. Feedback Resistor Network:

   • Set the output voltage using the feedback resistor network. The formula for calculating the resistors is: [ V_ = V_ left(1 + fracright) ] where ( V_ = 0.6V ).

5. PCB Layout:

   • Keep the power loop area small to minimize parasitic inductance.
   • Place the ground plane under the device to improve thermal performance and reduce noise.

6. Thermal Considerations:

   • Ensure adequate heat dissipation by providing a thermal pad and using a heatsink if necessary.
   • Check the junction temperature during operation to ensure it remains within the operating temperature range.

7. Shutdown Function:

   • Apply a logic high signal to the SHDN pin to enable the device.
   • Apply a logic low signal to the SHDN pin to disable the device and enter shutdown mode.

8. Stability:

   • Use the recommended external components to ensure the converter operates stably over the entire input voltage and load range.

9. Safety:

   • Ensure all connections are secure and insulated to prevent short circuits.
   • Follow proper handling procedures to avoid damage to the device.

(For reference only)