LTC3815IUFE#PBF

Voltage - Output (Min/Fixed):	0.4V
Base Part Number:	LTC3815
Supplier Device Package:	38-QFN (4x6)
Package / Case:	38-WFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	Yes
Frequency - Switching:	1MHz
Current - Output:	6A
Voltage - Output (Max):	3.96V
Series:	--
Voltage - Input (Max):	5.5V
Voltage - Input (Min):	2.25V
Number of Outputs:	1
Output Type:	Programmable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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Introduction

The LTC3815IUFE#PBF is a high-efficiency, synchronous, step-down DC/DC switching regulator specifically designed for microprocessor supply applications. This device offers a total of four programmable high current step-down power sources from a single 2.7V to 5.5V input voltage source. It comes pre-programmed with 4-phase operation, allowing for a multitude of output current requirements. It also includes a Light Load Mode controller that enables energy optimization by reducing the output voltage in low load current conditions.

Application Field

The LTC3815IUFE#PBF is mainly used for a variety of DC/DC applications such as telecommunications systems, servers, storage systems, networking equipment, embedded systems, and digital interfaces. This device is applicable in all space-constrained applications that require high efficiency and excellent performance.

Working Principle

To understand how the LTC3815IUFE#PBF works, it’s important to first look at the internal linear and switching regulators. The switching regulators work like a power switch. Input power is fed through a series of switches, which are controlled by a DC control signal. When the control signal is high, the switches are on and the desired output power is delivered to the output nodes. When the control signal goes low, the switches are off and the power is disconnected from the output nodes. The linear regulator is a low-power, low-noise device that works like a variable resistor. It works by receiving a fixed input voltage and then the output voltage is constantly adjusted until the voltage at the output is equal to the setpoint voltage. The LTC3815IUFE#PBF combines the advantage of both linear and switching regulators, allowing for a wide range of voltages, output currents, and frequencies. This device includes an internal Light Load Mode controller that optimizes the efficiency at light load currents. It also provides up to four complete and phase-synchronized DC/DC converters with output current ratings up to 4A. With a constant frequency, current mode architecture, the LTC3815IUFE#PBF is able to provide noise-free switching frequencies, excellent dynamic line and load regulation, and excellent load transient response.

Conclusion

The LTC3815IUFE#PBF is a highly efficient step-down DC/DC switching regulator specifically designed for microprocessor supply applications. This device offers superb performance with very high efficiency and excellent load and line regulation. With its low-noise, constant frequency, current mode architecture, this device is a suitable choice for various applications in the field of telecommunication systems, servers, storage systems, embedded systems, and digital interfaces.

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