Standalone Li-Ion Switch Mode Battery Charger The LTC4002ES8-8.4#PBF is a battery charger controller IC manufactured by Linear Technology (now part of Analog Devices).
### **Specifications:**
- **Input Voltage Range:** 4.5V to 32V
- **Output Voltage:** 8.4V (for two-cell Li-Ion/Polymer batteries)
- **Charge Current:** Programmable up to 4A
- **Charge Termination:** C/10 or timer-based
- **Efficiency:** Up to 95%
- **Operating Temperature Range:** -40°C to 85°C
- **Package:** 8-Lead SOIC
### **Descriptions:**
- The LTC4002 is a high-efficiency synchronous step-down switching battery charger controller.
- It supports constant-current/constant-voltage (CC/CV) charging for Li-Ion/Polymer batteries.
- Includes an internal charge timer and automatic recharge functionality.
- Features an input current limit to prevent overloading the power source.
### **Features:**
- **Wide Input Voltage Range:** Supports 4.5V to 32V input.
- **Programmable Charge Current:** Up to 4A with an external sense resistor.
- **Synchronous Operation:** Improves efficiency and reduces heat dissipation.
- **Thermal Regulation:** Reduces charge current if temperature exceeds a safe limit.
- **Battery Detection:** Automatically detects battery presence.
- **Status Indicators:** Provides charge status via open-drain outputs.
- **Low Dropout Operation:** Allows charging even when input voltage is close to battery voltage.
This part is designed for applications requiring high-efficiency battery charging, such as portable devices, industrial equipment, and backup power systems.
