Details

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BUY RT9198-18GBR https://www.utsource.net/itm/p/6416009.html
REG LDO 1.8V 300MA SOT23-5

Parameter	Symbol	Conditions	Min	Typ	Max	Unit
Input Voltage	VIN	Operating Range	2.7		5.5	V
Output Voltage	VOUT	Fixed Output		1.8		V
Output Current	IOUT	Continuous Operation		300		mA
Quiescent Current	IQ	VIN = 5V, VOUT = 1.8V		40		μA
Dropout Voltage	VDROPOUT	IOUT = 300mA		300		mV
Load Regulation		0mA to 300mA		0.5		%
Line Regulation		VIN from 2.7V to 5.5V		0.2		%
Power Supply Rejection Ratio	PSRR	@ 1kHz		60		dB
Operating Junction Temperature	TJ	Storage	-40		85	°C

Instructions for RT9198-18GBR:

1. Input Voltage (VIN):

   • Ensure the input voltage is within the operating range of 2.7V to 5.5V. Exceeding this range can damage the device.

2. Output Voltage (VOUT):

   • The device provides a fixed output voltage of 1.8V. No external components are required for voltage setting.

3. Output Current (IOUT):

   • The regulator can supply up to 300mA continuously. Ensure that the load does not exceed this limit to avoid overheating or damage.

4. Quiescent Current (IQ):

   • At an input voltage of 5V and output voltage of 1.8V, the quiescent current is typically 40μA. This value helps in power budget calculations.

5. Dropout Voltage (VDROPOUT):

   • Under a load of 300mA, the dropout voltage is typically 300mV. Ensure the input voltage is at least this much higher than the output voltage to maintain regulation.

6. Load Regulation:

   • The load regulation is 0.5% over a load range from 0mA to 300mA, ensuring stable output voltage under varying load conditions.

7. Line Regulation:

   • The line regulation is 0.2% as the input voltage varies from 2.7V to 5.5V, maintaining output stability with input fluctuations.

8. Power Supply Rejection Ratio (PSRR):

   • The PSRR is 60dB at 1kHz, effectively rejecting ripple and noise from the input supply.

9. Operating Junction Temperature (TJ):

   • The device operates safely within a junction temperature range of -40°C to 85°C. Ensure proper heat dissipation if operating near the upper limit.

For detailed design considerations and application circuits, refer to the datasheet provided by Richtek Technology Corporation.

(For reference only)