Monolithic 4A Wide Input 1 Cell Li-Ion Battery Charger The LT3651EUHE-4.2#PBF is a monolithic step-down switching regulator manufactured by Linear Technology (now part of Analog Devices). Below are its specifications, descriptions, and features based on factual information:
### **Specifications:**
- **Input Voltage Range:** 4.95V to 32V
- **Output Voltage:** 4.2V (fixed)
- **Output Current:** Up to 1A
- **Switching Frequency:** 1MHz (typical)
- **Efficiency:** Up to 94%
- **Operating Temperature Range:** -40°C to +125°C
- **Package:** 16-Lead TSSOP (Exposed Pad)
- **Topology:** Step-down (Buck) regulator
- **Control Method:** Current-mode PWM
- **Protection Features:** Overcurrent, overtemperature, and reverse battery protection
### **Descriptions:**
The LT3651EUHE-4.2#PBF is a high-efficiency, monolithic step-down switching regulator designed for battery charging applications, particularly for single-cell Li-Ion/Polymer batteries. It integrates a power switch, oscillator, control circuitry, and protection features in a compact TSSOP package. The fixed 4.2V output makes it ideal for charging Li-Ion batteries with a termination voltage of 4.2V.
### **Features:**
- **Wide Input Voltage Range (4.95V to 32V):** Supports various power sources, including automotive and industrial supplies.
- **High Efficiency (Up to 94%):** Minimizes power loss and heat dissipation.
- **1MHz Switching Frequency:** Allows for small external components.
- **Integrated Power Switch:** Simplifies design and reduces external component count.
- **Precision 4.2V Output:** Optimized for single-cell Li-Ion battery charging.
- **Programmable Charge Current:** Adjustable via an external resistor.
- **Battery Float Voltage Accuracy:** ±0.6% (typical).
- **Thermal Regulation:** Prevents overheating by reducing charge current if necessary.
- **Reverse Battery Protection:** Safeguards the circuit if the battery is connected in reverse.
- **Compact 16-Lead TSSOP Package:** Suitable for space-constrained applications.
This information is strictly based on the manufacturer's datasheet and specifications.
