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MAX639CSA+ from MAXIM,MAXIM - Dallas Semiconductor

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MAX639CSA+

Manufacturer: MAXIM, MAIXM

5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters

Partnumber Manufacturer Quantity Availability
MAX639CSA+,MAX639CSA MAXIM, MAIXM 2553 In Stock

Description and Introduction

5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters The MAX639CSA+ is a voltage regulator manufactured by Maxim Integrated (now part of Analog Devices). Below are the factual specifications, descriptions, and features from Ic-phoenix technical data files:

### **Specifications:**
- **Manufacturer:** Maxim Integrated (MAIXM)  
- **Part Number:** MAX639CSA+  
- **Type:** Step-Down (Buck) Switching Regulator  
- **Input Voltage Range:** 5.5V to 11.5V  
- **Output Voltage:** 5V (Fixed)  
- **Output Current:** Up to 225mA  
- **Switching Frequency:** 65kHz (Typical)  
- **Efficiency:** Up to 90%  
- **Dropout Voltage:** 0.5V (Typical)  
- **Operating Temperature Range:** 0°C to +70°C  
- **Package:** 8-Pin SOIC  

### **Descriptions:**
The MAX639CSA+ is a low-power, step-down DC-DC converter designed for applications requiring a regulated 5V output from a higher input voltage. It integrates a power switch, oscillator, and control circuitry, minimizing external component count. It is suitable for battery-powered and portable devices.

### **Features:**
- **Low Quiescent Current:** 100µA (Typical)  
- **Internal Power Switch:** Reduces external component requirements  
- **Short-Circuit Protection:** Enhances reliability  
- **Low Dropout Voltage:** Improves efficiency at low input voltages  
- **Wide Input Voltage Range:** Supports 5.5V to 11.5V  
- **Fixed 5V Output:** No external feedback resistors needed  
- **Compact Package:** 8-Pin SOIC for space-constrained applications  

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

Application Scenarios & Design Considerations

5V/3.3V/3V Adjustable, High-Efficiency, Low-IQ, Step-Down DC-DC Converters

Alternative Part Number

  • LM2594M-5.0 --: Pin-compatible step-down switching regulator in the same class, widely available and often used as a drop-in replacement for MAX639 buck converters.
  • MC34063A --: Versatile general-purpose DC-DC switching regulator that can be configured for buck operation similar to the MAX639, with broad availability and low cost.
  • L5973D --: Integrated step-down switching regulator with comparable input voltage range and current capability, suitable as a functional alternative.
  • MC34063ACD --: Versatile DC-DC converter IC that can be configured as a step-down regulator covering the MAX639 function, very common and low cost.

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