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LM3420M5-8.2 from NS,National Semiconductor

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LM3420M5-8.2

Manufacturer: NS, NATIONAL

Lithium-Ion Battery Charge Controller

Partnumber Manufacturer Quantity Availability
LM3420M5-8.2,LM3420M582 NS, NATIONAL 3992 In Stock

Description and Introduction

Lithium-Ion Battery Charge Controller The LM3420M5-8.2 is a linear charger controller manufactured by National Semiconductor (NS).  

### **Specifications:**  
- **Part Number:** LM3420M5-8.2  
- **Manufacturer:** National Semiconductor (NS)  
- **Package:** SOT-23-5  
- **Output Voltage:** 8.2V (fixed)  
- **Input Voltage Range:** 4.5V to 75V  
- **Charging Current:** Adjustable via external resistor  
- **Operating Temperature Range:** -40°C to +125°C  
- **Features:**  
  - Constant-current/constant-voltage charging  
  - Thermal regulation to prevent overheating  
  - Low shutdown current (<1µA)  
  - Adjustable charge termination  
  - Reverse battery protection  

### **Descriptions:**  
The LM3420M5-8.2 is designed for charging lithium-ion (Li-ion) or lithium-polymer (Li-Po) batteries. It provides a fixed 8.2V output, making it suitable for two-cell Li-ion battery packs. The device supports both constant-current and constant-voltage charging phases and includes thermal regulation for safe operation.  

### **Features:**  
- **Wide Input Voltage Range (4.5V to 75V):** Supports various power sources.  
- **Adjustable Charging Current:** Set using an external resistor.  
- **Thermal Regulation:** Prevents overheating during charging.  
- **Low Shutdown Current:** Minimizes power consumption when inactive.  
- **Reverse Battery Protection:** Safeguards against incorrect battery connections.  
- **Compact SOT-23-5 Package:** Suitable for space-constrained applications.  

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

Application Scenarios & Design Considerations

Lithium-Ion Battery Charge Controller

Alternative Part Number

  • BQ2002ESN --: Lithium-ion battery charge controller in SOIC package, similar function to the LM3420 series and widely available from TI.
  • MCP73831T-2ACI/OT --: Single-cell Li-ion charge management controller with similar regulation function, available in small SOT-23 package.
  • LT1510CS8 --: Constant-current/constant-voltage battery charger IC that can serve as a functional substitute for the LM3420 charge controller.
  • BQ2002T --: TI battery charge controller in the same function class, widely available and a common substitute for National battery management ICs.
  • MAX712CPE --: Standalone NiCd/NiMH fast-charge controller with similar charge-termination functionality, suitable as a functional replacement.
  • LT1510CS --: Constant-current/constant-voltage battery charger IC offering comparable charging control for lithium and NiMH cells.

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