Lithium-Ion Linear Battery Charger in ThinSOT The LTC1734LES6-4.2#TR is a lithium-ion battery charger IC manufactured by Linear Technology (now part of Analog Devices).
### **Specifications:**
- **Input Voltage Range:** 4.5V to 10V
- **Charge Voltage:** Fixed 4.2V (for single-cell Li-ion batteries)
- **Charge Current:** Programmable up to 1A
- **Precision Charge Voltage:** ±0.6%
- **Charge Termination:** C/10 (10% of programmed current)
- **Package:** 6-Lead SOT-23
- **Operating Temperature Range:** -40°C to +85°C
- **Low Battery Detection:** Yes
- **Thermal Regulation:** Yes (prevents overheating)
- **Battery Float Voltage Accuracy:** ±0.6%
- **Status Outputs:** Charge Status (CHRG) and Power Good (PWRGD)
### **Descriptions:**
- The LTC1734 is a standalone linear charger for single-cell lithium-ion batteries.
- It features automatic charge termination and trickle charging for deeply discharged cells.
- The IC includes thermal regulation to optimize charge rate based on temperature.
- It operates in constant-current/constant-voltage (CC/CV) mode.
### **Features:**
- **Standalone Operation:** No external microcontroller required.
- **Programmable Charge Current:** Set via an external resistor.
- **Low Dropout Voltage:** Allows efficient charging even with low input voltage.
- **Automatic Recharge:** Initiates charging if battery voltage falls below a threshold.
- **Reverse Battery Protection:** Safeguards against incorrect battery insertion.
- **Power Good Output:** Indicates when input voltage is sufficient for charging.
- **Charge Status Output:** Indicates charging in progress or completion.
This IC is designed for portable applications requiring compact and efficient lithium-ion battery charging.
