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LM2831XMF from NS,National Semiconductor

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LM2831XMF

Manufacturer: NS, NSC

High Frequency 1.5A Load - Step-Down DC-DC Regulator

Partnumber Manufacturer Quantity Availability
LM2831XMF NS, NSC 1046 In Stock

Description and Introduction

High Frequency 1.5A Load - Step-Down DC-DC Regulator The LM2831XMF is a step-down DC-DC converter manufactured by National Semiconductor (NSC). Below are its specifications, descriptions, and features based on factual information:

### **Specifications:**
- **Input Voltage Range:** 3 V to 5.5 V  
- **Output Voltage Range:** Adjustable from 0.8 V to 3.3 V (fixed options available)  
- **Output Current:** Up to 1.5 A  
- **Switching Frequency:** 1.6 MHz (typical)  
- **Efficiency:** Up to 95%  
- **Operating Temperature Range:** -40°C to +125°C  
- **Package:** SOT-23-5 (Thin)  

### **Descriptions:**
- The LM2831XMF is a high-efficiency, step-down (buck) DC-DC converter designed for low-voltage applications.  
- It integrates a high-side P-channel MOSFET and a synchronous rectifier for improved efficiency.  
- The device operates at a fixed frequency of 1.6 MHz, allowing the use of small external components.  
- It includes features like thermal shutdown, current limiting, and undervoltage lockout (UVLO) for protection.  

### **Features:**
- **High Efficiency:** Up to 95% due to synchronous rectification.  
- **Fixed-Frequency Operation:** 1.6 MHz PWM switching for reduced noise and smaller external components.  
- **Low Dropout Operation:** Maintains regulation even when the input voltage approaches the output voltage.  
- **Internal Soft-Start:** Reduces inrush current during startup.  
- **Thermal Shutdown:** Protects the device from overheating.  
- **Current Limit Protection:** Prevents damage from excessive load current.  
- **Undervoltage Lockout (UVLO):** Ensures proper operation under low input voltage conditions.  

This information is strictly based on the manufacturer's datasheet for the LM2831XMF.

Application Scenarios & Design Considerations

High Frequency 1.5A Load - Step-Down DC-DC Regulator

Alternative Part Number

  • TPS62290DRV --: Pin-compatible step-down converter in the same small package class with comparable input voltage and current rating; TI is the direct successor brand for many National Semiconductor parts.
  • AP3211KTR-G1 --: Wide-input 1.5A synchronous buck converter in a similar SOT-23 package, offering comparable switching performance and an easy drop-in evaluation path.
  • MP2359DJ-LF-Z --: 1.2A step-down converter with similar input range and compact package, widely available and commonly used as a functional substitute for small buck regulators.
  • MP2359DJ --: Low-cost 1.2A step-down regulator with similar package footprint and electrical characteristics, good second-source option.

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