LN2054 - Standalone Linear Li-Ion Battery Charger with Thermal Regulation
LN2266 - Ultra-small, Low-voltage Start-up PWM Controlled Boost DC/DC Regulator
Overview
The LN2266 is a miniature, high-efficiency, boost DC/DC regulator. The circuit consists of a current-mode PWM control loop, error amplifier, ramp generation circuit, comparator, and a power switch. It operates efficiently and stably across a wide load range. With a start-up voltage below 1V, it can be powered by 1-4 battery cells. When using a lithium battery, it provides an output current of up to 1100mA. The 17μA quiescent current and up to 90% conversion efficiency effectively extend battery life. The output voltage can be set by adjusting two external resistors. It includes a built-in 2.5A power switch.
Applications
- MP3 / PDA
- Electronic Dictionaries / Learning Machines
- RF Tags
- Portable Mobile Devices
- Wireless Communication Equipment
- DSC, LCD Displays
Features
| Feature | Specification |
|---|---|
| Low Voltage Operation | Guaranteed start-up at 0.9V (Iout=1mA) |
| Switching Frequency | 1000 kHz |
| Conversion Efficiency | 90% |
| Output Current | 3.3V / 300mA (Single Alkaline Battery) 5V / 1100mA (Single Lithium Battery) |
| Voltage Accuracy | Adjustable from 2V to 5.2V, accuracy up to ±2.0% |
| Quiescent Current | Typical 17 μA |
| Shutdown Current | Typical 0.01 μA |
| Packages | SOT23-6L, SOT89-5L |