The MC34085DW is a monolithic high voltage switching regulator designed to provide all necessary features to implement cost effective buck, boost, and buck-boost regulators. The device integrates a temperature compensated bandgap reference, fixed frequency oscillator, error amplifier, PWM control circuitry, and a robust NPN output switch with current limit protection. It is optimized for off-line and DC-to-DC regulator applications.

Applications

• Off-line Power Supplies
• DC-to-DC Converters
• Battery Chargers
• LED Drivers
• Industrial Control Systems

Features

• High Voltage Operation: Input voltage up to 40V.
• Integrated NPN Switch: Internal switch capable of handling peak currents up to 1.5A.
• Fixed Frequency Oscillator: Operates at a fixed frequency of 300 kHz (typical).
• Overcurrent Protection: Prevents damage from excessive current draw.
• Thermal Shutdown: Protects the device from overheating.
• Soft-Start Function: Reduces inrush current during startup.
• Low Startup Current: Typical startup current of 100 μA.

Benefits

• Cost-Effective: Integrated features reduce external component count, lowering the overall cost of the power supply.
• Versatile: Can be used in buck, boost, and buck-boost configurations.
• Reliable: Built-in protection features ensure reliable operation.
• Easy to Design: Fixed frequency operation simplifies the design process.
• Efficient: High efficiency operation minimizes power loss.

Additional Details

The MC34085DW is available in a SOIC-16 package. Its features make it ideal for a wide range of applications requiring efficient and reliable power conversion. It is commonly used in applications where space is limited and a high level of integration is required. The device's robust design and integrated protection features contribute to its long-term reliability and performance.