LTC3539EDCB#TRMPBF

Voltage - Output (Min/Fixed):	1.5V
Base Part Number:	LTC3539
Supplier Device Package:	8-DFN (2x3)
Package / Case:	8-WFDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 85°C (TA)
Synchronous Rectifier:	Yes
Frequency - Switching:	1MHz
Current - Output:	2A (Switch)
Voltage - Output (Max):	5.25V
Series:	--
Voltage - Input (Max):	5V
Voltage - Input (Min):	0.5V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LTC3539EDCB#TRMPBF Application Field and Working Principles

Introduction

The LTC3539EDCB#TRMPBF (LTC3539) is a 3A, 4.5V to 52V, dual output, nanosecond-precision voltage regulator from Linear Technology. It is a trustable integrated solution for high power DC-DC applications such as distributed power systems in datacenters, CPU power supplies and ASIC or FPGA implementations. It provides up to 96.4% efficiency and can be used to support load currents from 10mA to 3A with a single output.

Application Field

LTC3539 is categorized as a PMIC (Power Management IC) voltage regulators of the DC-DC switching regulators. It is mainly used for distributed power systems in datacenters, processor power supplies and ASIC or FPGA implementations.For distributed power systems, it provides an extremely high level of current regulation that is required in many processor power systems. It is also used in ASIC or FPGA implementations since its wide input voltage range enables it to operate from up to 4.5V to 52V, making it suitable for a wide array of low-voltage, intermediate and high-voltage operation.Since the LTC3539 uses switching regulators, it is ideal for applications that require a very high efficiency. It can provide up to 96.4% efficiency with load currents from 10mA up to 3A with a single output. The LTC3539 has low noise performance, which is a key feature when trying to minimize interference on other components in the system.

Working Principle

The LTC3539 is based on the two-phase resonant architecture and uses two control loops to provide dynamic current sharing between the two outputs. The two control loops are the voltage loop and the current loop, which are used to regulate the output voltage and current for the two outputs, respectively.The voltage loop is implemented using an analog multiplier, which multiplies the voltage reference by the feedback voltage at the output. The current loop is implemented using a digital multiplier with a dynamic correction, which adjusts the output current to match the reference while compensating for variations in the output voltage.The dynamic current sharing between the two output channels is accomplished by two devices, the switching regulator and a sensing circuit. The sensing circuit senses the current flowing through an inductor, which represents the power path from the input to the output. The sensed current is then compared with a reference current and the difference between the two is used to adjust the duty cycle of the switching regulator. This results in dynamic current sharing between the two outputs.The LTC3539 provides over temperature protection, short circuit protection, over current protection and output voltage monitoring. It is packaged in a 14-pin MSOP package, which is designed to fit a wide variety of board layouts.

Conclusion

In conclusion, the LTC3539 is a 3A, 4.5V to 52V, dual output, nanosecond-precision voltage regulator from Linear Technology. It is categorized as a PMIC (Power Management IC) voltage regulators of the DC-DC switching regulators. The LTC3539 can be used for distributed power systems in datacenters, processor power supplies and ASIC or FPGA implementations. It provides up to 96.4% efficiency with load currents from 10mA up to 3A with a single output. It uses two-phase resonant and two control loops (the voltage loop and the current loop) for dynamic current sharing between the two outputs, and provides over temperature protection, short circuit protection, over current protection and output voltage monitoring.

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