High Efficiency USB Power Manager + Triple Step-Down DC/DC The LTC3555EUFD#TRPBF is a highly integrated power management IC (PMIC) manufactured by Linear Technology (now part of Analog Devices).
### **Specifications:**
- **Manufacturer:** Linear Technology (LT)
- **Part Number:** LTC3555EUFD#TRPBF
- **Package:** 24-Lead QFN (4mm x 4mm)
- **Input Voltage Range:** 4.35V to 5.5V (USB-compatible)
- **Output Voltages:**
- **Buck Regulator 1:** Adjustable (0.8V to 3.8V)
- **Buck Regulator 2:** Adjustable (0.8V to 3.8V)
- **LDO Regulator:** Fixed 3.3V or Adjustable (1.5V to 3.3V)
- **Charging Current:** Up to 950mA (programmable)
- **Battery Charger:** Li-Ion/Polymer with thermal regulation
- **Efficiency:** Up to 95% (buck regulators)
- **Switching Frequency:** 2.25MHz (fixed)
- **Operating Temperature Range:** -40°C to +85°C
### **Descriptions:**
The LTC3555EUFD#TRPBF is a compact, high-efficiency power management solution designed for portable applications. It integrates two synchronous buck regulators, a linear regulator, and a Li-Ion/Polymer battery charger. It is optimized for USB-powered systems and supports dynamic power path management.
### **Features:**
- **Dual Synchronous Buck Regulators:** High efficiency, low ripple.
- **Li-Ion/Polymer Battery Charger:** Programmable charge current, thermal regulation.
- **Power Path Management:** Seamless transition between battery and input power.
- **Low Quiescent Current:** Extends battery life.
- **I²C Control Interface:** Adjustable output voltages and charger settings.
- **Thermal Protection:** Prevents overheating.
- **Small Footprint:** 24-lead QFN package (4mm x 4mm).
This IC is commonly used in smartphones, tablets, portable medical devices, and other battery-powered applications.
