USB-Powered Li+ Charger The MAX1811ESA is a USB-powered Li+ battery charger manufactured by Maxim Integrated. Below are its specifications, descriptions, and features:
### **Specifications:**
- **Manufacturer:** Maxim Integrated
- **Part Number:** MAX1811ESA
- **Package:** 8-pin SOIC (Small Outline Integrated Circuit)
- **Input Voltage Range:** 4.35V to 6.5V (USB-compatible)
- **Output Voltage:** Programmable (4.1V or 4.2V) for Li+ batteries
- **Charge Current:** Up to 500mA (adjustable via external resistor)
- **Charge Termination:** Voltage-based (constant-voltage/constant-current)
- **Operating Temperature Range:** -40°C to +85°C
### **Descriptions:**
- The MAX1811ESA is a single-cell Li+ battery charger designed for USB-powered applications.
- It integrates a current-limited power switch, eliminating the need for an external FET.
- The device supports both USB and AC adapter power sources with automatic input selection.
- It features thermal regulation to prevent overheating during charging.
### **Features:**
- **USB/AC Adapter Input Compatibility** – Works with both USB and wall adapter power sources.
- **Programmable Charge Voltage** – Selectable 4.1V or 4.2V for different Li+ battery chemistries.
- **Adjustable Charge Current** – Set via an external resistor (up to 500mA).
- **Automatic Power Source Selection** – Prioritizes AC adapter input when available.
- **Thermal Regulation** – Reduces charge current if temperature exceeds safe limits.
- **Charge Status Output** – Open-drain output indicates charging or charge completion.
- **Low Battery Detection** – Ensures safe charging even with deeply discharged batteries.
This information is based solely on the manufacturer's datasheet and technical documentation.
