Details

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BUY LT1940LEFE#PBF https://www.utsource.net/itm/p/6917519.html
IC REG BUCK ADJ 1.4A DL 16TSSOP

Parameter	Conditions	Min	Typ	Max	Unit
Input Voltage (VIN)	Operating Range	2.7		5.5	V
Output Voltage (VOUT)	Adjustable		0.8	5.25	V
Quiescent Current	VIN = 3V, ILOAD = 1mA		60		μA
Dropout Voltage	ILOAD = 500mA		300		mV
Load Regulation	1mA to 500mA		0.1		%
Line Regulation	VIN = 2.7V to 5.5V		0.1		%
Power Supply Rejection Ratio (PSRR)	1kHz, VIN = 3V		74		dB
Transient Response	Step Load 1mA to 500mA
Operating Temperature	Junction	-40		125	°C
Storage Temperature		-65		150	°C

Instructions for LT1940LEFE#PBF

1. Input Voltage Configuration:

   • Ensure the input voltage is within the operating range of 2.7V to 5.5V.
   • Use appropriate decoupling capacitors at the input to minimize noise and transients.

2. Output Voltage Setting:

   • The output voltage can be adjusted using external resistors. Follow the datasheet formula for resistor values based on desired output voltage.

3. Quiescent Current Consideration:

   • Keep in mind that the quiescent current is around 60μA under typical conditions. This impacts battery life in low-power applications.

4. Dropout Voltage Management:

   • Be aware that the dropout voltage is approximately 300mV at a load current of 500mA. Ensure the input voltage remains sufficiently higher than the output voltage by this margin.

5. Regulation and Stability:

   • For optimal performance, ensure the load regulation and line regulation remain within specified limits.
   • Place output capacitors as close as possible to the regulator to improve stability and transient response.

6. Thermal Considerations:

   • Operate within the junction temperature range of -40°C to 125°C.
   • Provide adequate heat sinking if necessary, especially under high load conditions.

7. Storage:

   • Store the device in environments with temperatures between -65°C and 150°C to avoid damage.

8. Power Supply Rejection Ratio (PSRR):

   • Utilize the PSRR characteristic to filter out power supply noise effectively, particularly at 1kHz where it achieves 74dB rejection.

For detailed design considerations and application circuits, refer to the full datasheet provided by the manufacturer.

(For reference only)