1.25A, 4MHz, Synchronous Step-Down DC/DC Converter The LTC3411EDD#PBF is a high-efficiency, monolithic synchronous step-down DC/DC converter manufactured by **Linear Technology (now part of Analog Devices)**.
### **Specifications:**
- **Input Voltage Range:** 2.25V to 5.5V
- **Output Voltage Range:** 0.8V to 5V (adjustable via external resistors)
- **Maximum Output Current:** 4A
- **Switching Frequency:** 1.25MHz (fixed)
- **Efficiency:** Up to 95%
- **Operating Temperature Range:** -40°C to +125°C
- **Package:** 10-Lead DFN (3mm × 3mm)
- **Synchronous Rectification:** Yes (integrated MOSFETs)
- **Current Mode Control:** Yes
- **Low Dropout Operation:** 100% duty cycle
- **Quiescent Current:** 40μA (in shutdown mode)
### **Descriptions:**
The LTC3411EDD#PBF is designed for high-performance power conversion in portable and battery-powered applications. It features **current-mode control** for fast transient response and stable operation. The **integrated synchronous rectification** improves efficiency by reducing power losses. The device operates at a fixed **1.25MHz switching frequency**, allowing the use of small external components.
### **Features:**
- **High Efficiency:** Up to 95% due to synchronous rectification.
- **Wide Input Voltage Range:** Supports 2.25V to 5.5V input.
- **Adjustable Output Voltage:** Configurable from 0.8V to 5V.
- **Low Quiescent Current:** 40μA in shutdown mode for power-saving applications.
- **Internal Soft-Start:** Reduces inrush current during startup.
- **Thermal Protection:** Prevents overheating damage.
- **Short-Circuit Protection:** Enhances reliability.
- **Small Footprint:** 10-Lead DFN package (3mm × 3mm) for space-constrained designs.
This converter is suitable for **portable devices, battery-powered systems, and point-of-load regulation** where high efficiency and compact size are critical.
