Details

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BUY LM2990T-15 https://www.utsource.net/itm/p/12607082.html

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Input Voltage	VIN	-	2.1	-	4.5	V
Output Voltage	VOUT	-	-	1.5	-	V
Quiescent Current	IQ	VIN = 3V, IOUT = 0mA	-	60	-	μA
Dropout Voltage	VD	IOUT = 100mA, VIN = 3V	-	250	-	mV
Load Regulation	ΔVOL	IOUT = 0mA to 100mA	-	2	-	mV
Line Regulation	ΔVOL	VIN = 2.7V to 4.5V	-	1	-	mV
Reference Voltage	VREF	-	-	1.24	-	V
Power Supply Rejection	PSRR	f = 120Hz	-	70	-	dB

Instructions for LM2990T-15

1. Input Voltage (VIN):

   • Ensure the input voltage is within the range of 2.1V to 4.5V to avoid damage and ensure optimal performance.

2. Output Voltage (VOUT):

   • The LM2990T-15 provides a fixed output voltage of 1.5V. No external components are required for setting this voltage.

3. Quiescent Current (IQ):

   • The quiescent current is very low at 60μA, making it suitable for battery-operated devices where power consumption needs to be minimized.

4. Dropout Voltage (VD):

   • Keep the dropout voltage in mind when designing your circuit. It should ideally be less than 250mV at 100mA load current.

5. Load Regulation:

   • The load regulation is excellent, with only a 2mV change from no load to full load conditions.

6. Line Regulation:

   • Line regulation is also very good, ensuring minimal output voltage change over the specified input voltage range.

7. Reference Voltage (VREF):

   • An internal reference voltage of 1.24V is used internally by the regulator.

8. Power Supply Rejection Ratio (PSRR):

   • The regulator has a PSRR of 70dB at 120Hz, effectively rejecting ripple and noise from the input supply.

9. Circuit Design Considerations:

   • Place bypass capacitors close to the input and output terminals to reduce noise and improve stability.
   • Ensure adequate heat sinking if operating near maximum load conditions to prevent overheating.

10. Storage and Handling:

    • Store in a dry environment and handle with care to avoid electrostatic discharge (ESD) damage.

(For reference only)