Power supply, standard voltage # BA3913 Technical Documentation
## 1. Application Scenarios
### Typical Use Cases
The BA3913 is a high-performance voltage regulator IC primarily designed for power management applications in portable electronic devices. Its compact package and efficient operation make it ideal for:
- Battery-powered systems requiring stable voltage regulation
- Mobile communication devices where power efficiency is critical
- Portable medical equipment demanding reliable power supply
- IoT sensor nodes operating on limited power budgets
- Wearable electronics with space constraints
### Industry Applications
Consumer Electronics
- Smartphones and tablets for peripheral power management
- Digital cameras and portable media players
- Bluetooth headsets and wireless accessories
Industrial Systems
- Sensor interface circuits
- Data acquisition systems
- Industrial control modules
Automotive Electronics
- Infotainment systems
- Telematics control units
- Advanced driver assistance systems (ADAS)
### Practical Advantages
Key Benefits:
- Low dropout voltage (typically 150mV at 100mA load)
- High power supply rejection ratio (70dB at 1kHz)
- Ultra-low quiescent current (35μA typical)
- Wide operating voltage range (2.0V to 6.0V)
- Built-in overcurrent protection
- Thermal shutdown protection
Limitations:
- Maximum output current limited to 300mA
- Fixed output voltage options may not suit all applications
- Temperature range constrained to -40°C to +85°C
- Requires external capacitors for stable operation
## 2. Design Considerations
### Common Design Pitfalls and Solutions
Output Instability
- Problem: Oscillations due to improper capacitor selection
- Solution: Use 1.0μF or larger ceramic capacitor at output with low ESR
Power Dissipation Issues
- Problem: Thermal shutdown during high load conditions
- Solution: Ensure adequate PCB copper area for heat dissipation
- Calculation: P_DISS = (V_IN - V_OUT) × I_OUT
Start-up Problems
- Problem: Slow rise time affecting system initialization
- Solution: Implement soft-start circuitry if critical for application
### Compatibility Issues
Input Power Sources
- Compatible with Li-ion batteries (3.0V-4.2V)
- Works with USB power (5.0V ±10%)
- May require pre-regulation for higher voltage inputs
Load Circuit Compatibility
- Ideal for digital ICs and microcontrollers
- Suitable for analog circuits with proper decoupling
- Limited for motor drivers or high-current LED arrays
Component Interactions
- Sensitive to: RF interference in wireless applications
- Requires isolation from: Switching regulators and noisy digital circuits
### PCB Layout Recommendations
Power Routing
- Use wide traces for input and output power paths
- Place input capacitor within 5mm of VIN pin
- Position output capacitor close to VOUT pin
Grounding Strategy
- Implement single-point grounding for analog sections
- Use separate ground planes for digital and analog circuits
- Connect thermal pad directly to ground plane
Thermal Management
- Provide adequate copper area for heat dissipation
- Use thermal vias under the package for improved cooling
- Consider external heatsinking for high ambient temperatures
Signal Integrity
- Route sensitive analog traces away from switching nodes
- Use guard rings around critical analog components
- Implement proper decoupling capacitor placement
## 3. Technical Specifications
### Key Parameter Explanations
Electrical Characteristics (@ T_A = 25°C, V_IN = 3.3V unless specified)
| Parameter | Symbol |
