Details

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BUY NJW0281G & NJW0302G https://www.utsource.net/itm/p/8853617.html

Parameter	NJW0281G	NJW0302G
Type	Switching Regulator	Switching Regulator
Input Voltage Range	4.5V to 28V	4.5V to 28V
Output Voltage	Adjustable (1.25V to 26V)	Adjustable (1.25V to 26V)
Switching Frequency	1.0MHz	1.0MHz
Quiescent Current	170μA (typical)	170μA (typical)
Shutdown Current	<1μA	<1μA
Package	SOP-8	SOP-8
Protection Features	Overcurrent, Overtemperature, Undervoltage Lockout	Overcurrent, Overtemperature, Undervoltage Lockout
Operating Temperature	-40°C to +85°C	-40°C to +85°C

Instructions for Use

General Setup

1. Input Capacitor (CIN):

   • Place a ceramic capacitor of at least 1μF close to the input pin to ensure stable operation.

2. Output Capacitor (COUT):

   • Use a ceramic or tantalum capacitor with a value that meets the stability criteria specified in the datasheet.

3. Inductor Selection:

   • Choose an inductor based on the desired output current and switching frequency. Refer to the datasheet for recommended values.

4. Feedback Resistor Network (RFB1, RFB2):

   • Set the output voltage by configuring the feedback resistors according to the formula provided in the datasheet.

Specific Considerations

• NJW0281G & NJW0302G:
  • Ensure proper PCB layout to minimize noise and parasitic effects.
  • For adjustable output versions, carefully select the resistor values to achieve the desired output voltage.
  • Test the circuit under load conditions to verify performance and stability.

Shutdown Functionality

• Both devices feature a shutdown pin that can be used to place the regulator in a low-power state.
• Apply a logic low to the shutdown pin to disable the regulator and reduce power consumption.

Protection Features

• Built-in overcurrent protection limits the output current to prevent damage during overload conditions.
• Overtemperature protection ensures safe operation by reducing the duty cycle if the junction temperature exceeds safe limits.
• Undervoltage lockout prevents operation when the input voltage is below a threshold to protect against improper startup conditions.

(For reference only)