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MAX1845EEI from MAX,MAXIM - Dallas Semiconductor

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MAX1845EEI

Manufacturer: MAX, MAXIM

Dual / High-Efficiency / Step-Down Controller with Accurate Current Limit

Partnumber Manufacturer Quantity Availability
MAX1845EEI MAX, MAXIM 1140 In Stock

Description and Introduction

Dual / High-Efficiency / Step-Down Controller with Accurate Current Limit The MAX1845EEI is a step-down DC-DC converter manufactured by Maxim Integrated. Below are its key specifications, descriptions, and features:

### **Specifications:**  
- **Input Voltage Range:** 2.5V to 5.5V  
- **Output Voltage Range:** Adjustable from 0.8V to VIN  
- **Output Current:** Up to 500mA  
- **Switching Frequency:** 1MHz (typical)  
- **Efficiency:** Up to 95%  
- **Operating Temperature Range:** -40°C to +85°C  
- **Package:** 28-pin QSOP  

### **Descriptions:**  
The MAX1845EEI is a high-efficiency, step-down DC-DC converter designed for low-power applications. It integrates synchronous rectification to minimize external components and improve efficiency. The device operates at a fixed 1MHz switching frequency, enabling the use of small inductors and capacitors.  

### **Features:**  
- **Synchronous Rectification:** Improves efficiency and reduces power dissipation.  
- **Low Dropout Operation:** Allows the output to stay in regulation even when the input voltage approaches the output voltage.  
- **Pulse-Width Modulation (PWM) Mode:** Ensures stable operation under varying load conditions.  
- **Soft-Start Function:** Prevents inrush current at startup.  
- **Short-Circuit Protection:** Safeguards the device during fault conditions.  
- **Low Quiescent Current:** Enhances efficiency in light-load conditions.  
- **Adjustable Output Voltage:** Set via external resistors.  

This information is based solely on the manufacturer's datasheet for the MAX1845EEI.

Application Scenarios & Design Considerations

Dual / High-Efficiency / Step-Down Controller with Accurate Current Limit

Alternative Part Number

  • ISL6227CAZ --: Dual synchronous buck PWM controller with similar dual-output architecture and voltage-mode control, commonly used as a MAX1845 substitute in notebook power designs.
  • TPS51124RGER --: Dual-channel synchronous buck controller for notebook DDR/GPU rails, functionally comparable to MAX1845 with integrated drivers and similar pin function set.
  • RT8209BGQW --: Dual synchronous buck controller offering comparable output capability and control scheme, widely used as a cost-effective alternative in similar power supply applications.
  • RT8205LZQW --: Dual synchronous buck controller targeting notebook power supplies, functionally similar to MAX1845 with wide input range and low-cost availability.

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