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LM3420AM5-8.4 from NSC,National Semiconductor

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LM3420AM5-8.4

Manufacturer: NSC, NS

Lithium-Ion Battery Charge Controller

Partnumber Manufacturer Quantity Availability
LM3420AM5-8.4,LM3420AM584 NSC, NS 3322 In Stock

Description and Introduction

Lithium-Ion Battery Charge Controller The LM3420AM5-8.4 is a lithium-ion battery charger controller manufactured by National Semiconductor (NS). Below are the factual details from Ic-phoenix technical data files:

### **Specifications:**
- **Manufacturer:** National Semiconductor (NS)  
- **Part Number:** LM3420AM5-8.4  
- **Function:** Lithium-Ion Battery Charger Controller  
- **Output Voltage:** 8.4V (for 2-cell Li-Ion batteries)  
- **Package Type:** SOT-23-5 (Miniature Surface-Mount)  
- **Input Voltage Range:** 4.5V to 36V  
- **Charging Current:** Adjustable via external resistor  
- **Charge Termination:** Voltage-based (constant-voltage/constant-current)  
- **Operating Temperature Range:** -40°C to +125°C  

### **Descriptions:**
- The LM3420AM5-8.4 is designed for charging 2-cell lithium-ion (Li-Ion) or lithium-polymer (Li-Po) batteries.  
- It operates in a constant-current/constant-voltage (CC/CV) charging mode.  
- The device includes thermal regulation to prevent overheating.  
- It is suitable for portable electronics, power tools, and other battery-powered applications.  

### **Features:**
- **Wide Input Voltage Range (4.5V to 36V):** Supports various power sources.  
- **Precision Voltage Regulation:** Ensures accurate charging termination at 8.4V.  
- **Adjustable Charging Current:** Set via an external resistor.  
- **Thermal Protection:** Prevents damage from excessive heat.  
- **Small Footprint:** SOT-23-5 package for space-constrained designs.  
- **Low Quiescent Current:** Enhances efficiency in standby mode.  

This information is based solely on the manufacturer's datasheet and specifications.

Application Scenarios & Design Considerations

Lithium-Ion Battery Charge Controller

Alternative Part Number

  • BQ2057WTS --: Single-cell Li-ion charge controller in SOT-23-5 with similar 8.4V regulation function; TI is the successor to NSC and this part is a common drop-in style alternative.
  • MCP73831T-2ACI/OT --: Compact Li-ion/Li-Po charge management controller in SOT-23-5, widely available and functionally comparable for 2-cell 8.4V charging applications.
  • LTC4054ES5-4.2 --: Well-known linear Li-ion battery charger in a small SOT-23-5 package; suitable as a cross-reference for small-form-factor battery charging designs.
  • BQ2057WSN --: Single-cell Li-ion linear charge controller with similar voltage regulation function; TI absorbed National Semiconductor, so this is a close functional replacement in the same product family lineage.
  • LT1510CS8 --: Constant-current/constant-voltage battery charger IC supporting Li-ion chemistry with adjustable output voltage, suitable as a functional substitute for the LM3420 controller.

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