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LM3420AM5X-8.4 from NATIONAL,National Semiconductor

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LM3420AM5X-8.4

Manufacturer: NATIONAL, NS

Lithium-Ion Battery Charge Controller
Partnumber Manufacturer Quantity Availability
LM3420AM5X-8.4,LM3420AM5X84 NATIONAL, NS 7066 In Stock

Description and Introduction

Lithium-Ion Battery Charge Controller The LM3420AM5X-8.4 is a battery charge controller manufactured by National Semiconductor (now part of Texas Instruments).  

### **Specifications:**  
- **Manufacturer:** National Semiconductor  
- **Part Number:** LM3420AM5X-8.4  
- **Function:** Lithium-Ion Battery Charge Controller  
- **Output Voltage:** 8.4V (for 2-cell Li-Ion batteries)  
- **Package:** SOT-23-5  
- **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  
- **Features:**  
  - Thermal shutdown protection  
  - Under-voltage lockout (UVLO)  
  - Charge status indicator  

### **Descriptions & Features:**  
- Designed for charging 2-cell Li-Ion battery packs (8.4V).  
- Supports constant-current (CC) and constant-voltage (CV) charging modes.  
- Includes an integrated pass transistor driver for external MOSFET control.  
- Adjustable charge current using an external sense resistor.  
- Thermal protection ensures safe operation under high-temperature conditions.  
- Compact SOT-23-5 package for space-constrained applications.  

This device is optimized for portable electronics, power tools, and other battery-powered systems requiring precise Li-Ion charging.

Application Scenarios & Design Considerations

Lithium-Ion Battery Charge Controller

Alternative Part Number

  • BQ2057WSN --: Single-cell Li-ion linear charge controller with similar 8.4V two-cell regulation capability and widely available as a functional substitute.
  • MAX1811ESA+ --: USB-powered single-cell Li-ion charger IC offering comparable charge management functions in an SOT-23 package.
  • MCP73831T-2ACI/OT --: Compact linear Li-ion charge management controller with similar small-package footprint and simple charge termination.
  • BQ2057WTS --: Single-cell Li-ion linear charge controller with similar 8.4V two-cell regulation function; TI is the successor to National Semiconductor, so this is the closest functional replacement.
  • LTC4054LES5-4.2 --: Standalone linear Li-ion battery charger in a small package, offering comparable charge-control functionality for portable designs.

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