Details

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BUY AN6652 https://www.utsource.net/itm/p/12610235.html

Parameter	Description	Value
Device Type	High Efficiency, Low Noise, Synchronous Buck Converter	-
Input Voltage Range	The range of input voltages over which the device can operate	4.5V to 17V
Output Voltage Range	The range of output voltages that can be set by external resistors	0.8V to 5.5V
Switching Frequency	The frequency at which the internal switch operates	200kHz to 2MHz (Adjustable)
Output Current	Maximum continuous output current	3A
Efficiency	Typical efficiency under nominal conditions	Up to 95%
Operating Temperature	The temperature range over which the device is guaranteed to function	-40掳C to 125掳C
Package Type	The type of package used for the device	QFN-16 (4x4mm)
Protection Features	Built-in protection features	Overcurrent, Overtemperature, Undervoltage Lockout
Quiescent Current	The current consumed by the device when no load is present	50渭A
Enable Pin	Functionality of the enable pin	Controls device operation (High: ON, Low: OFF)
Soft Start Time	Time taken for the output voltage to ramp up from zero to its set value	Adjustable (Typically 1ms to 5ms)
Voltage Feedback Loop	Gain and bandwidth of the voltage feedback loop	Adjustable via external compensation network
Frequency Synchronization	Ability to synchronize the switching frequency with an external clock	Yes

Instructions

1. Power Supply Connection:

   • Connect the input voltage (VIN) to the VIN pin.
   • Connect the ground (GND) to the GND pin.

2. Output Voltage Setting:

   • Use external resistors R1 and R2 to set the output voltage (VOUT) according to the formula: [ V_ = V_ left(1 + fracright) ]
   • Where ( V_ ) is typically 0.8V.

3. Switching Frequency Adjustment:

   • Set the switching frequency using an external resistor (RT) connected to the RT/CLK pin.
   • The relationship between the resistor value and the switching frequency is given by: [ f_ = frac{1.1 times 10^6} ]

4. Enable Pin:

   • To turn on the converter, apply a high logic level (typically 3.3V or 5V) to the EN pin.
   • To turn off the converter, apply a low logic level (0V) to the EN pin.

5. Soft Start:

   • Connect a capacitor (CSS) to the SS pin to set the soft start time.
   • The soft start time is approximately: [ t_ approx 1.1 times C_ times 10^6 ]

6. Frequency Synchronization:

   • To synchronize the switching frequency with an external clock, connect the external clock signal to the RT/CLK pin.

7. Thermal Management:

   • Ensure adequate heat dissipation by providing a good thermal path from the exposed pad (EP) to the PCB.

8. Protection Features:

   • The device includes overcurrent, overtemperature, and undervoltage lockout protection. No additional components are required for these features.

9. Layout Considerations:

   • Place the input and output capacitors as close as possible to the respective pins.
   • Use wide traces for power paths to minimize inductance and resistance.
   • Ensure a solid ground plane to reduce noise and improve stability.

10. Testing:

    • Before finalizing the design, test the converter under various operating conditions to ensure it meets the required performance specifications.

(For reference only)