Details

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BUY F4905S https://www.utsource.net/itm/p/11531264.html

Parameter	Symbol	Min	Typical	Max	Unit	Conditions
Input Voltage	VIN	2.7	-	5.5	V	-
Output Voltage	VOUT	1.8	-	3.3	V	Adjustable
Output Current	IOUT	-	500	1000	mA	Continuous
Quiescent Current	IQ	-	10	20	渭A	No Load
Dropout Voltage	VD	-	120	200	mV	IOUT = 500mA, VIN = 3.3V
Power Supply Rejection Ratio (PSRR)	PSRR	-	70	80	dB	f = 1kHz, IOUT = 100mA
Thermal Shutdown Temperature	TSD	-	160	-	掳C	-
Operating Temperature	TOPR	-40	-	125	掳C	-
Storage Temperature	TSTG	-65	-	150	掳C	-

Instructions for Using F4905S:

1. Input Voltage (VIN):

   • Ensure the input voltage is within the range of 2.7V to 5.5V.
   • Use appropriate input capacitors (e.g., 1渭F ceramic) to stabilize the input voltage.

2. Output Voltage (VOUT):

   • The output voltage can be adjusted between 1.8V and 3.3V using external resistors.
   • Use the formula: ( V_ = 1.23 left(1 + fracright) ) to set the desired output voltage.
   • Recommended resistor values: R1 = 10k惟, R2 = 10k惟 to 33k惟.

3. Output Current (IOUT):

   • The device can provide up to 1000mA of continuous output current.
   • For higher currents, ensure proper heat dissipation and use a heatsink if necessary.

4. Quiescent Current (IQ):

   • The quiescent current is typically 10渭A with no load.
   • This low quiescent current makes the F4905S suitable for battery-powered applications.

5. Dropout Voltage (VD):

   • The dropout voltage is typically 120mV at 500mA output current.
   • Ensure the input voltage is at least 120mV higher than the desired output voltage to maintain regulation.

6. Power Supply Rejection Ratio (PSRR):

   • The PSRR is typically 70dB at 1kHz, which helps in reducing noise from the input supply.
   • Use bypass capacitors (e.g., 10渭F electrolytic) on the output to further reduce ripple and noise.

7. Thermal Shutdown (TSD):

   • The device will shut down if the junction temperature exceeds approximately 160掳C.
   • Ensure adequate cooling to prevent thermal shutdown, especially under high load conditions.

8. Operating and Storage Temperature:

   • The operating temperature range is -40掳C to 125掳C.
   • The storage temperature range is -65掳C to 150掳C.

Additional Notes:

• Always refer to the datasheet for detailed information and specific application notes.
• Use proper PCB layout techniques to minimize noise and improve performance.
• Ensure all components are rated for the expected operating conditions.

(For reference only)