LGS5145
Manufacturer
Model
LGS5145
Category
The LGS5145 is a compact step-down DC-DC converter designed for low-power applications requiring adjustable voltage regulation between 4.5V and 55V. With a 1A output current rating, 1.2MHz switching frequency, and SOT-23-6 package, it is suitable for portable devices and IoT systems. Key features include built-in synchronous rectification, low quiescent current, and thermal stability up to 105℃. Engineers should prioritize proper thermal management and adhere to soldering guidelines to ensure reliability. While cost-effective and compact, its current and voltage limitations make it unsuitable for high-power or high-frequency scenarios.
Reference Pricing
Reference Stock
Specifications
| Conversion Efficiency | N/A |
| Input Voltage Range | 5V - 55V |
| Load Regulation | N/A |
| On-Resistance | 600mΩ |
| Operating Temperature Range | -40°C to +105°C |
| Output Current | N/A |
| Output Voltage | N/A |
| Package Type | SOT-23-6 |
| Rated Voltage | N/A |
| Ripple Voltage | N/A |
| Switching Frequency | 1.2MHz - 1.4MHz |
| Switching Loss | N/A |
| Thermal Resistance | N/A |
Function And Role
Core Function
Step-down DC-DC converter with adjustable output voltage
Key Characteristics
- 1A output current capability
- 4.5V to 55V input voltage range
- 1.2MHz switching frequency
- Built-in synchronous rectifier
- Quiescent current of 150µA
- SOT-23-6 surface-mount package
Application Domains
Basic Scenarios
- Portable electronic devices
- IoT sensor nodes
- Low-power consumer electronics
Extended Scenarios
- Medical device power systems
- Industrial automation modules
- Wireless communication equipment
Precautions
| Soldering | Use 260-280℃ reflow soldering with 20-30s peak time |
| Current Limit | Max continuous current 1A (Peak 2A for 10s) |
| Voltage Limit | Input voltage must be within 4.5-55V DC range |
| Thermal Management | Thermal resistance 32.5°C/W at junction temperature |
| Storage | Store in <10% RH, -20℃ to +85℃ environment |
| Risk Warnings |
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Alternative Model Params
- Output current (must ≥0.8A)
- Input voltage range (must include 4.5-55V)
- Package type (SOT-23-6 required)
- Switching frequency (1.0-1.5MHz acceptable)
Design Recommendations
| Layout | Maintain 10mm trace length between SW and GND pins |
| Thermal | Add 10x10mm copper pour for heat dissipation |
| Compatibility | Use 10µF/16V X7R capacitor at input/output |
| Testing | Verify output ripple <50mV at 1MHz bandwidth |
Market Positioning
| Strengths |
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| Weaknesses |
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