XRP7665IDBTR-F: High-Performance 3A Step-Down DC-DC Switching Regulator by MaxLinear

The XRP7665IDBTR-F represents a pinnacle of power management technology, delivering exceptional efficiency and reliability in a compact package. As a synchronous step-down (buck) DC-DC switching regulator from MaxLinear, Inc., this IC has become a preferred solution for engineers designing power systems across multiple industries, despite its obsolete status in the manufacturer's catalog.

Comprehensive Product Overview

Manufacturer Background

Developed by MaxLinear, Inc. (formerly Exar Corporation), a leader in high-performance analog and mixed-signal semiconductors, the XRP7665IDBTR-F embodies years of power management expertise. The company's reputation for robust power ICs makes this regulator a trusted choice for critical applications.

Key Features and Benefits

• Wide Input Voltage Range: 4.5V to 18V operation accommodates various power sources including 12V/5V systems
• Precision Adjustable Output: 0.925V to 16V range with 1.5% output voltage accuracy
• High Current Capacity: 3A continuous output current with 4A peak capability
• Enhanced Efficiency: Up to 95% efficiency through synchronous rectification
• Thermal Management: 8-SOIC-EP package with exposed pad for superior heat dissipation
• Protection Features: Includes thermal shutdown, current limiting, and under-voltage lockout

Detailed Technical Specifications

Electrical Characteristics

Parameter	Value
Input Voltage Range	4.5V to 18V
Output Voltage Range	0.925V to 16V (adjustable)
Output Current	3A continuous, 4A peak
Switching Frequency	340kHz ( 15%)
Quiescent Current	2.5mA typical
Efficiency	Up to 95%

Package Information

• Package Type: 8-pin SOIC with Exposed Thermal Pad
• Dimensions: 4.90mm 3.90mm 1.75mm
• Pin Configuration:
  1. BST (Bootstrap)
  2. VIN (Input Voltage)
  3. SW (Switch Node)
  4. GND (Ground)
  5. FB (Feedback)
  6. COMP (Compensation)
  7. EN (Enable)
  8. SS/TRK (Soft-Start/Tracking)

Advanced Application Scenarios

Industrial Automation Systems

The XRP7665IDBTR-F excels in industrial environments where stable power is critical for:

• PLC modules requiring multiple voltage rails
• Industrial sensors with 4-20mA interfaces
• Motor control circuits needing precise voltage regulation

Telecommunications Infrastructure

Ideal for telecom applications including:

• Base station power subsystems
• Network switch voltage conversion
• Fiber optic transceiver power supplies

Automotive Electronics

With its wide operating temperature range (-40 C to +85 C), the regulator suits:

• Infotainment system power management
• ADAS sensor power supplies
• Telematics control units

Design Considerations

Layout Recommendations

For optimal performance:

• Use a low-ESR ceramic capacitor (10 F) near VIN pin
• Keep SW node traces short and wide
• Ensure proper thermal vias under exposed pad
• Separate analog (FB, COMP) and power (SW, VIN) grounds

External Component Selection

Critical components include:

• Inductor: 4.7 H to 10 H with 3A saturation current
• Input capacitor: 22 F low-ESR ceramic
• Output capacitor: 22 F to 47 F ceramic
• Feedback resistors: 1% tolerance for precise output

Competitive Advantages

The XRP7665IDBTR-F outperforms comparable regulators through:

• Higher Efficiency: Synchronous design reduces power loss by 15-20% vs. non-synchronous alternatives
• Better Thermal Performance: Exposed pad enables 30% lower junction temperatures
• Design Flexibility: Adjustable soft-start and tracking capabilities
• Space Savings: Compact 8-SOIC package reduces board area by 40% vs. TO-220 solutions

Migration Path and Alternatives

For new designs considering this obsolete part:

• Direct replacement: XRP7664 (higher 5A current version)
• Alternative options: TPS54332 from Texas Instruments or LT8610 from Analog Devices
• Upgrade path: MaxLinear's newer MxL7704 family for advanced features

Conclusion

The XRP7665IDBTR-F remains a technically superior choice for demanding power conversion applications, combining high efficiency, precise regulation, and robust protection features. Its versatile 4.5-18V input range and adjustable output make it particularly valuable for legacy system maintenance and specific new designs where its characteristics are unmatched.

Engineers continue to specify this regulator for:

• Retrofit and repair of existing equipment
• Applications requiring its unique voltage/current combination
• Designs benefiting from its proven reliability record

For technical support or purchasing options for the XRP7665IDBTR-F, contact our power components specialists today.