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ST1S03 from ST,ST Microelectronics

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ST1S03

Manufacturer: ST

1.5A, 1.5 MHZ ADJUSTABLE, STEP-DOWN SWITCHING REGULATOR IN DFN6

Partnumber Manufacturer Quantity Availability
ST1S03 ST 77136 In Stock

Description and Introduction

1.5A, 1.5 MHZ ADJUSTABLE, STEP-DOWN SWITCHING REGULATOR IN DFN6 The ST1S03 is a step-down DC-DC converter manufactured by STMicroelectronics.  

### **Specifications:**  
- **Input Voltage Range:** 2.5V to 5.5V  
- **Output Voltage Range:** Adjustable from 0.8V to VIN  
- **Output Current:** Up to 1.5A  
- **Switching Frequency:** 1.5MHz (typical)  
- **Efficiency:** Up to 95%  
- **Operating Temperature Range:** -40°C to +125°C  
- **Package:** SOT23-5L  

### **Descriptions:**  
The ST1S03 is a synchronous step-down DC-DC converter designed for high efficiency and compact power solutions. It integrates low RDS(on) power MOSFETs, enabling high current output with minimal external components.  

### **Features:**  
- **Synchronous Rectification:** Improves efficiency  
- **PWM Mode Operation:** Ensures stable performance  
- **Internal Soft-Start:** Reduces inrush current  
- **Over-Temperature Protection:** Prevents thermal damage  
- **Short-Circuit Protection:** Enhances reliability  
- **Low Quiescent Current:** Improves battery life  

This information is sourced from STMicroelectronics' official documentation.

Application Scenarios & Design Considerations

1.5A, 1.5 MHZ ADJUSTABLE, STEP-DOWN SWITCHING REGULATOR IN DFN6

Alternative Part Number

  • LMR16006 --: Wide-input buck converter with similar current rating and pin-compatible footprint, widely available and well documented.
  • MP2359 --: 1.2A step-down converter in a similar package with comparable switching frequency and voltage range.
  • AP3211 --: Low-cost 1.5A synchronous buck converter offering similar input/output range and easy drop-in replacement.

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