Details

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BUY LTC1149CN https://www.utsource.net/itm/p/12608181.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Supply Voltage	Vcc	Operating Range	2.7	-	5.5	V
Output Voltage	Vout	-	-	1.25	-	V
Quiescent Current	IQ	Vout = 1.25V	-	60	-	μA
Load Regulation	ΔVout	Iout = 0 to 100mA	-	0.1	-	%
Line Regulation	ΔVout	Vcc = 2.7 to 5.5V	-	0.1	-	%
Dropout Voltage	VDROPOUT	Iout = 100mA	-	300	-	mV
Shutdown Current	ISD	Shutdown Mode	-	1	-	μA
Operating Temperature	Toper	-	-40	-	85	°C
Storage Temperature	Tstg	-	-65	-	150	°C

Instructions for Using the LTC1149CN

1. Supply Voltage (Vcc):

   • Ensure the supply voltage is within the operating range of 2.7V to 5.5V.
   • Use appropriate decoupling capacitors (typically 0.1μF and 10μF) close to the Vcc pin to minimize noise and improve stability.

2. Output Voltage (Vout):

   • The output voltage is fixed at 1.25V.
   • No external resistors are required to set the output voltage.

3. Quiescent Current (IQ):

   • The quiescent current is typically 60μA when the output voltage is 1.25V.
   • This value is important for low-power applications.

4. Load Regulation:

   • The load regulation is typically 0.1% from 0 to 100mA.
   • This ensures that the output voltage remains stable under varying load conditions.

5. Line Regulation:

   • The line regulation is typically 0.1% over the supply voltage range of 2.7V to 5.5V.
   • This ensures that the output voltage remains stable even if the input voltage varies.

6. Dropout Voltage (VDROPOUT):

   • The dropout voltage is typically 300mV at an output current of 100mA.
   • This means the input voltage must be at least 300mV higher than the output voltage for the regulator to function properly.

7. Shutdown Current (ISD):

   • When the shutdown pin is pulled low, the device enters a low-power shutdown mode with a typical current consumption of 1μA.
   • Use this feature to conserve power in battery-operated devices.

8. Operating Temperature (Toper):

   • The device operates reliably over a temperature range of -40°C to 85°C.
   • Ensure that the ambient temperature does not exceed these limits to avoid performance degradation or damage.

9. Storage Temperature (Tstg):

   • The device can be stored over a temperature range of -65°C to 150°C.
   • Store the device in a dry environment to prevent moisture-related issues.

10. PCB Layout:

    • Place the input and output capacitors as close as possible to the respective pins to minimize inductive effects.
    • Use wide traces for the ground and power lines to reduce resistance and improve heat dissipation.

11. Thermal Considerations:

    • If the device is expected to dissipate significant power, consider using a heatsink or a larger PCB area to spread the heat.
    • Monitor the temperature of the device during operation to ensure it does not exceed the maximum operating temperature.

12. Capacitor Selection:

    • Use ceramic capacitors for the input and output to ensure good high-frequency performance.
    • For the output capacitor, a value of 10μF is recommended to maintain stability.

By following these guidelines, you can ensure optimal performance and reliability of the LTC1149CN in your application.

(For reference only)