Surface Mount Power Inductors # CDRH5D18101 Power Inductor Technical Documentation
*Manufacturer: SUMIDA*
## 1. Application Scenarios
### Typical Use Cases
The CDRH5D18101 is a high-performance shielded power inductor designed for demanding power management applications. Its compact CDRH5D18 series package (5.8mm × 5.8mm × 1.8mm) makes it ideal for space-constrained designs requiring efficient power conversion.
Primary Applications:
- DC-DC Converters : Buck, boost, and buck-boost configurations in switching frequencies from 500kHz to 3MHz
- Power Supply Modules : Point-of-load (POL) converters and voltage regulator modules (VRMs)
- Mobile Devices : Smartphones, tablets, and portable electronics requiring compact power solutions
- Embedded Systems : Industrial controllers, IoT devices, and automotive electronics
- RF Power Amplifiers : Supply line filtering and impedance matching networks
### Industry Applications
- Consumer Electronics : Power management in smartphones, wearables, and gaming consoles
- Automotive : Infotainment systems, ADAS modules, and body control units
- Telecommunications : Base station power supplies and network equipment
- Industrial Automation : Motor drives, PLCs, and sensor interfaces
- Medical Devices : Portable medical equipment and diagnostic instruments
### Practical Advantages and Limitations
Advantages:
- High Efficiency : Low DC resistance (typically 0.18Ω) minimizes power losses
- Excellent Shielding : Magnetic shielding reduces EMI radiation by 40-50dB compared to unshielded counterparts
- Thermal Performance : Stable inductance up to 125°C with minimal thermal derating
- Current Handling : Saturation current up to 2.5A and thermal current rating of 2.8A
- Mechanical Robustness : Withstands mechanical stress and vibration in harsh environments
Limitations:
- Frequency Limitations : Performance degradation above 5MHz due to core material characteristics
- Size Constraints : Fixed footprint may not suit ultra-miniaturized designs
- Cost Considerations : Higher cost compared to unshielded or wire-wound alternatives
- Availability : Limited to specific inductance values within the CDRH5D18 series
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Pitfall 1: Insufficient Current Margin
- Issue : Operating near saturation current causes inductance drop and efficiency loss
- Solution : Design with 20-30% current margin above maximum operating current
Pitfall 2: Improper Thermal Management
- Issue : Overheating due to inadequate PCB copper area or poor ventilation
- Solution : Implement thermal vias and sufficient copper pours for heat dissipation
Pitfall 3: EMI Compliance Failures
- Issue : Radiated emissions exceeding regulatory limits
- Solution : Ensure proper grounding and maintain recommended clearance distances
### Compatibility Issues with Other Components
Switching Regulators:
- Compatible with most synchronous buck controllers (TPS62xxx, LM36xxx series)
- May require compensation adjustment with certain voltage mode controllers
Capacitors:
- Works optimally with ceramic output capacitors (X5R/X7R dielectric)
- Avoid using with high-ESR electrolytic capacitors in critical filtering applications
Semiconductors:
- Optimal performance with MOSFETs having switching speeds <10ns
- Compatible with GaN and SiC power devices for high-frequency applications
### PCB Layout Recommendations
Placement Guidelines:
- Position close to switching IC (within 5mm) to minimize parasitic inductance
- Orient to minimize magnetic coupling with sensitive analog circuits
- Maintain minimum 2mm clearance from other magnetic components
Routing Considerations:
- Use wide, short traces for high-current paths (minimum 20mil
