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LM3420AM5-4.2 from NATIONAL,National Semiconductor

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LM3420AM5-4.2

Manufacturer: NATIONAL, NSC

Lithium-Ion Battery Charge Controller

Partnumber Manufacturer Quantity Availability
LM3420AM5-4.2,LM3420AM542 NATIONAL, NSC 130800 In Stock

Description and Introduction

Lithium-Ion Battery Charge Controller The LM3420AM5-4.2 is a lithium-ion battery charger controller manufactured by National Semiconductor (now part of Texas Instruments).  

### **Specifications:**  
- **Input Voltage Range:** 4.5V to 75V  
- **Battery Voltage:** 4.2V (designed for single-cell Li-ion batteries)  
- **Package:** SOT-23-5 (5-pin)  
- **Charging Current:** Adjustable via external resistor  
- **Charge Termination:** Constant-Current/Constant-Voltage (CC/CV) with automatic termination  
- **Preconditioning Mode:** For deeply discharged batteries  
- **Thermal Regulation:** Prevents overheating  
- **Low Quiescent Current:** Minimizes power loss  
- **Operating Temperature Range:** -40°C to +125°C  

### **Features:**  
- **Wide Input Voltage Range:** Supports various power sources.  
- **Precision Voltage Regulation:** Ensures accurate 4.2V charging.  
- **Programmable Charge Current:** Adjustable via external resistor.  
- **Automatic Charge Termination:** Stops charging when battery is full.  
- **Thermal Protection:** Prevents damage from overheating.  
- **Small Form Factor:** SOT-23-5 package for space-constrained designs.  

This IC is commonly used in portable electronics, power tools, and other battery-powered applications requiring precise Li-ion charging.

Application Scenarios & Design Considerations

Lithium-Ion Battery Charge Controller

Alternative Part Number

  • BQ2002T --: Single-cell lithium-ion charge controller with 4.2V regulation, functionally similar to the LM3420 in battery charger applications.
  • MCP73831T-2ACI/OT --: Compact single-cell Li-ion charge management controller with 4.2V float voltage, suitable drop-in style replacement for small battery charger designs.
  • TP4056 --: Widely used single-cell Li-ion linear charger IC with 4.2V regulation, low cost and easy availability as an alternative charger solution.

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