Ferrite drum core construction. # CDRH105RNP2R2NC Power Inductor Technical Documentation
*Manufacturer: SUMIDA*
## 1. Application Scenarios
### Typical Use Cases
The CDRH105RNP2R2NC is a 2.2µH shielded power inductor designed for high-frequency power conversion applications. Typical use cases include:
DC-DC Converters
- Buck converter output filtering in 1-3A applications
- Boost converter energy storage elements
- SEPIC and Ćuk converter configurations
- Point-of-load (POL) converters for microprocessor power supplies
Power Management Systems
- Voltage regulator modules (VRMs)
- Switching frequency range: 500kHz to 2MHz
- Low-power motor drive circuits
- LED driver circuits requiring stable current regulation
### Industry Applications
Consumer Electronics
- Smartphones and tablets (power management ICs)
- Laptop computers (CPU/GPU power delivery)
- Gaming consoles and portable devices
- Wearable technology power systems
Automotive Electronics
- Infotainment system power supplies
- Advanced driver assistance systems (ADAS)
- LED lighting control modules
- Sensor power conditioning circuits
Industrial Equipment
- PLC and industrial controller power sections
- Test and measurement equipment
- Robotics control systems
- Communication infrastructure equipment
### Practical Advantages and Limitations
Advantages:
- Shielded Construction : Minimizes electromagnetic interference (EMI) with adjacent components
- High Saturation Current : 3.8A rating ensures reliable operation under load transients
- Low DC Resistance : 45mΩ typical reduces power losses and improves efficiency
- Thermal Stability : Maintains inductance within ±20% over operating temperature range
- Compact Size : 10.0×10.0×4.5mm footprint suitable for space-constrained designs
Limitations:
- Frequency Dependency : Performance degrades above 3MHz due to core material characteristics
- Current Handling : Not suitable for high-power applications exceeding 4A continuous current
- Temperature Constraints : Derating required above 85°C ambient temperature
- Cost Considerations : Higher cost compared to unshielded alternatives in price-sensitive applications
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Pitfall 1: Inadequate Current Rating Selection
- Problem : Selecting inductor based solely on inductance value without considering saturation current
- Solution : Ensure peak current never exceeds Isat (3.8A) with 20% safety margin
Pitfall 2: Thermal Management Issues
- Problem : Overheating due to poor airflow or excessive ripple current
- Solution : Implement thermal vias in PCB, ensure adequate spacing for air circulation
Pitfall 3: Resonance and Ringing
- Problem : Parasitic capacitance causing resonance at high frequencies
- Solution : Use proper snubber circuits and minimize trace lengths
### Compatibility Issues with Other Components
Semiconductor Compatibility
- Optimal pairing with synchronous buck controllers (e.g., TPS62300, MAX8640Y)
- Compatible with MOSFETs having switching frequencies up to 2MHz
- Avoid pairing with components generating excessive voltage spikes (>30V)
Capacitor Selection
- Requires low-ESR ceramic capacitors (X7R/X5R) for input/output filtering
- Bulk capacitors should be placed close to inductor terminals
- Tantalum capacitors may cause stability issues in feedback loops
Layout Conflicts
- Keep sensitive analog circuits (references, feedback) away from magnetic field
- Maintain minimum 5mm clearance from other magnetic components
### PCB Layout Recommendations
Placement Guidelines
- Position as close as possible to switching MOSFETs (≤10mm trace length)
- Orient to minimize loop area between input capacitor, switch, and inductor
- Ensure ground plane
