Details

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Below is the parameter table and instructions for the MIC5842BN, a Low Dropout Linear Regulator from Micrel (now part of Microchip Technology).

Parameter Table

Parameter	Symbol	Min	Typ	Max	Unit	Conditions
Input Voltage	( V_ )	1.6	-	5.5	V
Output Voltage	( V_ )	0.98	-	5.0	V	Adjustable
Output Current	( I_ )	-	150	300	mA	Typical at 3.3V output
Dropout Voltage	( V_ )	-	0.2	0.4	V	@ 300mA, 1.8V output
Quiescent Current	( I_Q )	-	60	100	μA	@ 300mA load
Shutdown Current	( I_ )	-	0.1	1	μA
Output Voltage Accuracy	-	-	±1.5%	-	%	@ 25°C
Load Regulation	-	-	0.2	0.5	mV	0mA to 300mA
Line Regulation	-	-	0.2	0.5	mV	2.7V to 5.5V input
Operating Temperature	( T_ )	-40	-	125	°C
Storage Temperature	( T_ )	-65	-	150	°C
Thermal Resistance (θJA)	-	-	125	-	°C/W	SOT-23 package

Instructions

1. Power Supply Connections:

   • Connect the input voltage (( V_ )) to the IN pin.
   • Connect the output voltage (( V_ )) to the OUT pin.
   • Ensure a bypass capacitor (typically 1μF) is placed close to the IN pin to filter out noise.

2. Output Voltage Setting:

   • The output voltage can be adjusted using external resistors ( R_1 ) and ( R_2 ) connected to the ADJ pin.
   • Use the following formula to set the output voltage: [ V_ = 1.23 left(1 + fracright) ]
   • For example, to set ( V_ ) to 3.3V, use ( R_1 = 10kOmega ) and ( R_2 = 18.2kOmega ).

3. Shutdown Function:

   • The device can be shut down by pulling the SHDN pin low. When the SHDN pin is high or left floating, the device is active.
   • To enable the shutdown function, connect the SHDN pin to ground through a switch or control signal.

4. Thermal Considerations:

   • Ensure adequate heat dissipation if the device is operating at high current or in high ambient temperatures.
   • The thermal resistance (θJA) of the SOT-23 package is 125°C/W. Calculate the power dissipation (( P_D )) using: [ P_D = (V_ - V_) times I_ ]
   • The junction temperature (( T_J )) can be estimated using: [ T_J = T_ + (P_D times theta_) ]

5. Capacitor Selection:

   • Use a 1μF ceramic capacitor for the input bypass.
   • A 1μF ceramic capacitor is recommended for the output to ensure stability.
   • For better transient response, a larger output capacitor (e.g., 10μF) can be used.

6. Layout Considerations:

   • Place the input and output capacitors as close as possible to the respective pins to minimize parasitic inductance.
   • Keep the ground connections short and wide to reduce ground impedance.

By following these instructions and parameters, you can effectively design and implement the MIC5842BN in your circuit.

(For reference only)