Details

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BUY MAX1954EUB+ https://www.utsource.net/itm/p/12592702.html

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
Quiescent Current	IQ	VIN = 3.6V, No Load	-	90	-	μA
Shutdown Current	ISD	VIN = 3.6V	-	0.1	-	μA
Output Current	IOUT	Dropout	-	150	-	mA
Dropout Voltage	VDROPOUT	IOUT = 150mA	-	300	-	mV
PSRR at 1kHz	PSRR	VIN = 3.6V	-	65	-	dB
Line Regulation	ΔVOUT/ΔVIN	VIN = 2.7V to 5.5V, IOUT = 10mA	-	0.05	-	%
Load Regulation	ΔVOUT/ΔIOUT	VIN = 3.6V, IOUT = 0 to 150mA	-	0.05	-	%

Instructions for MAX1954EUB+

1. Power Supply Connection:

   • Connect the input voltage (VIN) between 2.7V and 5.5V to the VIN pin.
   • Ensure a stable power supply with appropriate decoupling capacitors.

2. Output Configuration:

   • The output voltage (VOUT) is fixed at 1.8V. No external resistors are required for setting the output voltage.

3. Grounding:

   • Connect the GND pin directly to the system ground to ensure proper operation and stability.

4. Shutdown Feature:

   • To enable shutdown mode, pull the SHDN pin low. This reduces the current consumption to approximately 0.1μA.
   • For normal operation, keep the SHDN pin high or leave it floating.

5. Capacitor Selection:

   • Use ceramic capacitors with X7R dielectric for both input and output to minimize noise and improve transient response.
   • Typical values are 1μF for input and 1μF for output capacitance.

6. Thermal Considerations:

   • Ensure adequate heat dissipation if operating at higher currents or in high ambient temperatures.
   • Place the device on a PCB with thermal vias to enhance heat transfer.

7. Layout Guidelines:

   • Keep the input and output capacitor leads as short as possible to reduce parasitic inductance.
   • Maintain a clean layout with minimal trace lengths to sensitive pins like feedback and shutdown.

8. Applications:

   • Suitable for portable devices, battery-powered systems, and applications requiring low quiescent current and high efficiency.

(For reference only)