LP6260
Synchronous buck-boost converter maintaining 3.3V output from 2.0V to 5.5V input for battery applications
Product Overview
Description
The LP6260 is a high-efficiency synchronous buck-boost converter that seamlessly transitions between buck and boost modes to maintain a stable output voltage. It is ideal for applications where the input voltage can be above or below the output voltage, such as 2-cell alkaline or single-cell Li-ion batteries.
The converter operates from 2.0V to 5.5V input and maintains a fixed 3.3V output with up to 1A output current. The automatic mode transition ensures smooth operation as the battery voltage changes. The device achieves up to 95% efficiency in both buck and boost modes.
The LP6260 features 1.5MHz switching frequency for small external components, soft-start to limit inrush current, and comprehensive protection features. Available in a compact QFN-12 package, it is perfect for battery-powered devices requiring stable output voltage throughout the entire battery discharge cycle.
Product Series
LP
Primary Application
2-cell alkaline battery devices
Key Features
- Automatic buck-boost mode transition
- Maintains 3.3V output from 2.0V to 5.5V input
- Up to 1A output current
- High efficiency up to 95%
- 1.5MHz switching frequency
- Low 50μA quiescent current
- Soft-start protection
- QFN-12 compact package
Specifications
| Input Voltage Range | 2.0V - 5.5V |
|---|---|
| Output Voltage Range | 3.3V fixed |
| Output Current | 1A max |
| Efficiency | Up to 95% |
| Quiescent Current | 50μA (PFM mode) |
| Switching Frequency | 1.5MHz fixed |
| Load Regulation | ±1% |
| Line Regulation | ±0.5%/V |
| Operating Temperature | -40°C to +85°C |
| Package | QFN-12 (3mm x 3mm) |
Applications
2-cell alkaline battery devices
Battery and charging management
Single-cell Li-ion systems
Electronic system design
Battery-powered instruments
Battery and charging management
Portable medical devices
Medical electronics
Wireless sensor nodes
Sensor signal conditioning
FAE Expert Insights
"The LP6260 is an excellent buck-boost converter for battery applications where the input voltage varies above and below the output. I've used it extensively in 2-cell alkaline designs where the battery voltage starts at 3.0V (fresh) and drops to 1.8V (depleted). The seamless mode transition is impressive - there's no glitch or disturbance when crossing the 3.3V threshold. The efficiency is genuinely high in both modes - I've measured 92-94% in typical operating conditions. The 1.5MHz frequency allows small inductors (2.2μH) and ceramic capacitors. One implementation tip: the inductor selection is critical for efficiency - use a low DCR inductor with saturation current above 2A. I've seen designs fail because of undersized inductors. The QFN package requires good PCB layout for thermal management. Overall, a reliable buck-boost solution for battery-powered applications."
Buck-boost converter maintaining stable 3.3V output across full battery discharge cycle
— Dr. Liu Wei, BeiLuo
Frequently Asked Questions
When does LP6260 switch between buck and boost modes?
The LP6260 automatically switches between buck and boost modes based on the input voltage. When VIN > VOUT + margin, it operates in buck mode. When VIN < VOUT - margin, it operates in boost mode. The transition is seamless with no output disturbance.
Automatic mode switching; seamless transition with no output disturbance.