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LM3420M5-4.2 from NS,National Semiconductor

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LM3420M5-4.2

Manufacturer: NS

Lithium-Ion Battery Charge Controller
Partnumber Manufacturer Quantity Availability
LM3420M5-4.2,LM3420M542 NS 3000 In Stock

Description and Introduction

Lithium-Ion Battery Charge Controller The LM3420M5-4.2 is a lithium-ion battery charger controller manufactured by Texas Instruments (formerly National Semiconductor, NS).  

### **Specifications:**  
- **Input Voltage Range:** 4.5V to 75V  
- **Battery Voltage:** 4.2V (fixed for single-cell Li-ion)  
- **Charging Current:** Adjustable via external resistor  
- **Package:** SOT-23-5 (M5)  
- **Operating Temperature Range:** -40°C to +125°C  
- **Charge Termination:** Constant Voltage (CV) with automatic termination  
- **Features:** Thermal regulation, low battery detection, and charge status indication  

### **Descriptions:**  
The LM3420M5-4.2 is a high-voltage battery charger controller designed for single-cell lithium-ion batteries. It provides a constant-voltage (CV) charging profile with an automatic termination feature.  

### **Features:**  
- Wide input voltage range (4.5V to 75V)  
- Fixed 4.2V output for Li-ion batteries  
- Adjustable charging current  
- Thermal regulation for safe operation  
- Charge status indicator  
- Low battery detection  
- Small SOT-23-5 package  

This device is optimized for applications requiring high-voltage input and precise battery charging control.

Application Scenarios & Design Considerations

Lithium-Ion Battery Charge Controller

Alternative Part Number

  • BQ24040DSQR --: Single-cell Li-ion linear charger IC with 4.2V regulation, functionally similar to the LM3420 battery charger controller and widely available.
  • MCP73831T-2ACI/OT --: Compact single-cell Li-ion/Li-Po charge management controller with 4.2V float voltage, suitable drop-in functional replacement in SOT-23 packages.
  • TP4056 --: Low-cost 4.2V single-cell Li-ion linear charger IC commonly used as an alternative to LM3420-based charging circuits.

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