LM27313XMFX: Texas Instruments Boost Voltage Regulator - Features, Specs & Applications
LM27313XMFX: Texas Instruments' High-Efficiency Boost Voltage Regulator - Full Analysis
The LM27313XMFX from Texas Instruments (TI) is a premium-grade DC/DC switching regulator designed for applications requiring reliable step-up voltage conversion. Despite being marked as obsolete, this IC remains widely used in modern electronics due to its exceptional performance metrics and design flexibility. This in-depth guide covers everything engineers need to know about this versatile component.
Detailed Technical Specifications
1. Core Functionality
As a non-synchronous boost converter, the LM27313XMFX efficiently steps up input voltage with:
- 2.7V to 14V input range (ideal for battery-powered systems)
- Adjustable output from 5V to 28V via external resistors
- Fixed 1.6MHz switching frequency for compact designs
2. Performance Characteristics
| Parameter | Value |
|---|---|
| Maximum Switch Current | 800mA |
| Efficiency | Up to 90% (typical) |
| Operating Temperature | -40 C to +125 C (TJ) |
| Package | SOT-23-5 (2.9mm 1.6mm) |
3. Advanced Features
- Integrated N-channel MOSFET switch
- Internal soft-start for inrush current control
- Thermal shutdown protection
- Undervoltage lockout (UVLO)
Comprehensive Application Guide
1. Consumer Electronics
Perfect for:
- USB power delivery systems
- Backlight drivers for LCD displays
- Portable audio devices
2. Industrial Solutions
Widely implemented in:
- Sensor interface power supplies
- PLC module voltage boosters
- Data acquisition systems
3. Automotive Implementations
Common uses include:
- Infotainment system power management
- Telematics control units
- LED driver circuits
Design Considerations
1. Layout Best Practices
For optimal performance:
- Keep input capacitor (4.7 F typical) close to VIN pin
- Use short, wide traces for high-current paths
- Place feedback resistors near FB pin
2. Component Selection Guide
Critical external components:
- Schottky diode (1A rating minimum)
- Inductor (2.2 H to 10 H, 1A saturation current)
- Output capacitor (10 F ceramic recommended)
Why Engineers Choose LM27313XMFX
Five key advantages:
- Space-saving design: SOT-23-5 package enables ultra-compact PCB layouts
- Wide operating range: Handles nearly all battery configurations
- Design flexibility: Adjustable output suits multiple applications
- Reliable performance: Industrial-grade temperature tolerance
- Cost-effective: Reduces BOM count versus discrete solutions
Migration Options
For new designs considering alternatives:
- TI's TPS61093 (synchronous, higher efficiency)
- LM27313Y (3MHz switching frequency variant)
- LM2731 (similar functionality in different package)
Conclusion
The LM27313XMFX represents Texas Instruments' expertise in power management ICs, delivering robust boost conversion in a miniature footprint. While officially obsolete, its combination of performance parameters, design flexibility, and proven reliability continues to make it a preferred choice for engineers worldwide. For legacy system maintenance or cost-sensitive new designs, this regulator offers an exceptional balance of features and value.
Technical Resources: Download the complete LM27313XMFX datasheet for detailed specifications and application circuits.