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MAX639CSA from MAXIM,MAXIM - Dallas Semiconductor

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MAX639CSA

Manufacturer: MAXIM, MAX

5V or adjustable, high-efficiency, current-limiting PFM control scheme, step-down DC-DC converter.

Partnumber Manufacturer Quantity Availability
MAX639CSA MAXIM, MAX 350 In Stock

Description and Introduction

5V or adjustable, high-efficiency, current-limiting PFM control scheme, step-down DC-DC converter. The **MAX639CSA** is a voltage regulator manufactured by **MAXIM** (now part of Analog Devices). Below are its key specifications, descriptions, and features based on factual information from Ic-phoenix technical data files:

### **Specifications:**
- **Manufacturer:** MAXIM (Analog Devices)  
- **Type:** Step-Down (Buck) Switching Regulator  
- **Input Voltage Range:** 5.5V to 11.5V  
- **Output Voltage:** Fixed (5V) or Adjustable (via external resistors)  
- **Output Current:** Up to 225mA  
- **Switching Frequency:** ~65kHz  
- **Efficiency:** Up to 90%  
- **Operating Temperature Range:** 0°C to +70°C  
- **Package:** 8-Pin SOIC (CSA suffix)  

### **Descriptions:**
The MAX639CSA is a **low-power, step-down DC-DC converter** designed for battery-powered applications. It integrates a **PWM controller, power switch, and feedback circuitry** to provide a regulated output voltage. It is commonly used in portable electronics, embedded systems, and power management applications.

### **Features:**
- **Low Quiescent Current:** Typically 100µA (extends battery life)  
- **Internal Power MOSFET:** Simplifies external circuitry  
- **Fixed or Adjustable Output:** Supports 5V fixed or adjustable output via resistors  
- **Short-Circuit Protection:** Enhances reliability  
- **Low Dropout Operation:** Maintains regulation even with small input-output differentials  
- **Thermal Shutdown:** Prevents damage from overheating  

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

Application Scenarios & Design Considerations

5V or adjustable, high-efficiency, current-limiting PFM control scheme, step-down DC-DC converter.

Alternative Part Number

  • LM2594M-5.0 --: Pin-compatible step-down switching regulator with similar input voltage range and 5V fixed output, widely available and cost-effective replacement.
  • MC34063ACD --: Versatile DC-DC converter IC that can be configured for step-down operation, commonly used as a substitute for MAX639 in many designs.
  • L5973D --: Step-down switching regulator with comparable current capability and input voltage range, suitable drop-in alternative with minor circuit adjustments.

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