Description

The LR8Q is a high voltage, low output current, adjustable linear regulator which belongs to the category of IC Chips. It has a wide operating input voltage range of 13.2V to 450V. Its output voltage can be adjusted from 1.20V to 440V provided that the input voltage is at least 12V greater than the output voltage. It has current limiting and temperature limiting. The output current limit is typically 20mA and the minimum temperature limit is 125°C. An output short circuit current will therefore be limited to 20mA. An internal constant bias current of typically 10µA is connected to the ADJ pin. The device turns off when an external voltage greater than the output voltage of the LR8 is applied to VOUT of the LR8. A bypass capacitor of 1.0µF or larger and a minimum DC output current of 500µA are required for maintaining stability. The LR8Q is available in TO-243AA (SOT-89), TO-252 (D-PAK), and TO-92 packages.

Specifications and features

• Input Voltage Range: 13.2V to 450V
• Output Voltage Range: 1.20V to 440V
• Output Voltage Tolerance: 5%
• Output Current Limiting: Yes
• ADJ Current: 10µA
• Temperature Limiting: Yes
• Package Type: TO-243AA (SOT-89), TO-252 (D-PAK), and TO-92

Application Scenarios

• Off-line SMPS startup circuits
• Adjustable high voltage constant current source
• Industrial controls
• Motor controls
• Battery chargers
• Power supplies

Comparison

• Has a wide operating input voltage range of 13.2V to 450V
• Output voltage can be adjusted from 1.20V to 440V
• Has current limiting and temperature limiting
• Available in different package types

• Minimum DC output current of 500µA is required for maintaining stability
• The device turns off when an external voltage greater than the output voltage of the LR8 is applied to VOUT of the LR8