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LM3420M5-8.4 from NS,National Semiconductor

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LM3420M5-8.4

Manufacturer: NS, NS国半, NATIONAL, NSC

Lithium-Ion Battery Charge Controller

Partnumber Manufacturer Quantity Availability
LM3420M5-8.4,LM3420M584 NS, NS国半, NATIONAL, NSC 53511 In Stock

Description and Introduction

Lithium-Ion Battery Charge Controller The LM3420M5-8.4 is a switching regulator controller from National Semiconductor (NSC) designed for LED driver applications. Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:

### **Specifications:**
- **Manufacturer:** National Semiconductor (NSC)  
- **Part Number:** LM3420M5-8.4  
- **Package:** SOT-23-5  
- **Input Voltage Range:** 4.5V to 75V  
- **Output Voltage:** Adjustable (for LED driver applications)  
- **Switching Frequency:** Adjustable (external resistor programmable)  
- **Operating Temperature Range:** -40°C to +125°C  
- **Output Current:** Controller requires external MOSFET for current regulation  
- **Reference Voltage:** 1.24V (typical)  

### **Descriptions:**
- The LM3420M5-8.4 is a high-voltage LED driver controller designed to regulate current in LED strings.  
- It operates as a boost, buck, or buck-boost converter depending on the application requirements.  
- The device includes features for dimming control, thermal management, and fault protection.  

### **Features:**
- **Wide Input Voltage Range (4.5V to 75V)** – Suitable for automotive, industrial, and general LED lighting applications.  
- **Adjustable Switching Frequency** – Allows optimization for efficiency and component size.  
- **PWM Dimming Control** – Supports external PWM signals for brightness adjustment.  
- **Thermal Shutdown Protection** – Prevents damage due to overheating.  
- **Open LED Protection** – Detects and responds to LED open-circuit conditions.  
- **Low Shutdown Current (<1µA)** – Enhances power efficiency in standby mode.  
- **External N-Channel MOSFET Drive** – Allows flexibility in current regulation and power handling.  

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

Application Scenarios & Design Considerations

Lithium-Ion Battery Charge Controller

Alternative Part Number

  • BQ2057WTS --: Single-cell Li-ion charge controller with similar 8.4V regulation function; TI is the successor to National Semiconductor, so this is a close functional replacement.
  • MCP73831T-2ACI/OT --: Compact Li-ion/Li-Po charge management controller with programmable regulation, suitable as a functional alternative in similar battery charger designs.
  • LT1510CS8 --: Constant-current/constant-voltage battery charger IC that can be configured for 8.4V two-cell Li-ion charging, offering a different series and vendor for cross-reference.
  • BQ24074RGTR --: Single-cell Li-ion linear charger IC from TI (which acquired National Semiconductor), suitable as a functional replacement for battery charging applications.
  • TP4056 --: Low-cost single-cell Li-ion linear charger IC commonly used as a drop-in functional substitute in battery charging circuits.
  • BQ2057WSN --: Single-cell Li-ion linear charge controller with 8.4V regulation option, functionally similar to the LM3420 in battery charger designs.
  • LTC4054ES5-4.2 --: Standalone linear Li-ion battery charger in a small package, offering comparable charge-control functionality for portable designs.

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