# CDRH8D28HPNP100NC Power Inductor Technical Documentation*Manufacturer: SUMIDA*
## 1. Application Scenarios
### Typical Use Cases
The CDRH8D28HPNP100NC is a 10μH shielded power inductor designed for high-frequency power conversion applications. Typical implementations include:
DC-DC Converters
- Buck Converters : Primary energy storage element in step-down configurations
- Boost Converters : Energy transfer component in voltage step-up circuits
- Buck-Boost Converters : Bidirectional energy storage in variable output systems
Power Supply Filtering
- Input Filtering : Suppresses EMI and high-frequency noise from power sources
- Output Filtering : Smooths switching ripple in regulated power supplies
- LC Filter Networks : Combined with capacitors for enhanced noise suppression
### Industry Applications
Consumer Electronics
- Smartphones/Tablets : Power management ICs (PMICs) and processor power rails
- Laptops/Notebooks : CPU/GPU voltage regulation modules (VRMs)
- Wearable Devices : Compact power conversion in space-constrained designs
Automotive Systems
- Infotainment Systems : Power supply filtering for audio/video components
- ADAS Modules : Sensor power conditioning and noise suppression
- Body Control Modules : Low-voltage DC-DC conversion circuits
Industrial Equipment
- PLC Systems : Isolated power supply output filtering
- Motor Drives : Control circuit power conditioning
- Test/Measurement : Precision power supply output stages
### Practical Advantages and Limitations
Advantages
- High Saturation Current : 2.8A rating supports substantial load currents
- Shielded Construction : Minimizes EMI radiation and cross-talk
- High Temperature Operation : Stable performance up to 125°C
- Low DCR : 0.065Ω typical reduces power losses
- Compact Footprint : 8.0×8.0mm package suits space-constrained designs
Limitations
- Frequency Dependency : Performance varies significantly with operating frequency
- Thermal Considerations : Requires adequate PCB copper for heat dissipation
- Cost Factor : Higher priced than unshielded alternatives
- Size Constraints : May not suit ultra-miniature applications
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Saturation Current Miscalculation
- Pitfall : Operating near maximum saturation current causing inductance drop
- Solution : Design with 20-30% margin below Isat rating
- Implementation : Calculate peak current including transients and derate accordingly
Thermal Management Issues
- Pitfall : Overheating due to inadequate heat sinking
- Solution : Implement thermal vias and sufficient copper area
- Implementation : Use 2oz copper and thermal relief patterns
Resonance Problems
- Pitfall : Operating near self-resonant frequency (SRF)
- Solution : Ensure switching frequency < 80% of SRF
- Implementation : Characterize SRF and select appropriate switching frequency
### Compatibility Issues with Other Components
Capacitor Selection
- ESR Compatibility : Match output capacitor ESR to inductor characteristics
- Resonance Control : Avoid LC resonance at switching frequency harmonics
- Temperature Coefficients : Consider thermal performance matching
Semiconductor Interfaces
- Switching FETs : Ensure fast switching edges don't cause voltage spikes
- Controller ICs : Verify compatibility with inductor DCR and saturation characteristics
- Rectifiers : Match recovery characteristics to inductor current waveform
PCB Material Considerations
- Thermal Expansion : CTE matching to prevent mechanical stress
- Dielectric Properties : Stable performance across temperature range
- Copper Weight : Adequate current carrying capacity
### PCB
