LT3686IDD#PBF

Voltage - Output (Min/Fixed):	0.8V
Base Part Number:	LT3686
Supplier Device Package:	10-DFN (3x3)
Package / Case:	10-WFDFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Synchronous Rectifier:	No
Frequency - Switching:	300kHz ~ 2.5MHz
Current - Output:	1.2A
Voltage - Output (Max):	37V
Series:	--
Voltage - Input (Max):	37V
Voltage - Input (Min):	3.6V
Number of Outputs:	1
Output Type:	Adjustable
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Part Status:	Active
Packaging:	Tube

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LT3686IDD#PBF Application Field and Working Principle

Introduction

The LT3686IDD#PBF (hereafter referred to as the LT3686) is a low-voltage, high-current, synchronous buck converter DC/DC switching regulator from Linear Technology\'s family of PoL (Power over LAN) regulators. It is primarily used in power over Ethernet (PoE) applications, but can also be used for other types of applications, such as healthcare and industrial applications, which have stringent isolation, low power, and noise requirements. The LT3686 is designed to step down high input voltages (up to 44V) to low output voltages (as low as 0.7V) with high efficiency, low ripple, and excellent line and load regulation across a wide range of temperatures. It features a maximum power efficiency of up to 93%, is RoHS compliant, and has a typical junction-to-case thermal resistance of 1.2°C/W.

PMIC - Voltage Regulators - DC DC Switching Regulators

The LT3686 is a DC/DC switching regulator that falls into the category of PMIC (Power Management Integrated Circuit) or voltage regulator, specifically DC/DC switching regulators. A voltage regulator is essentially an electronic circuit that controls the voltage level of a supply voltage applied to a load by either boosting a lower voltage or by reducing a higher voltage, keeping it within certain predetermined safe and acceptable limits. Switching regulators, on the other hand, use efficient switch-mode techniques, such as pulse width modulation (PWM) or pulse frequency modulation (PFM), to provide voltage regulation with excellent line and load regulation, fast transient response, and low noise and power consumption.

Features

The LT3686 features a wide input voltage range, from 4V to 44V, and can convert that voltage to an output voltage as low as 0.7V with a maximum output current of 9A. It also has an integrated MOSFET with a 5Ω/7.5Ω RDS(on), which can support up to a 10A load. The LT3686\'s maximum power efficiency is up to 93% and it also features low ripple, low quiescent current, and high overhead margin. In addition, the LT3686 includes several protection features including undervoltage lockout, cycle-by-cycle current limiting, and adjustable soft-start and overvoltage protection, ensuring safe and reliable operations. The LT3686 also features an inrush current limit, which helps to reduce harmful inrush current during startup and minimize hot plug-in transients.

Working Principle

The LT3686 is a DC/DC switching regulator, which works on the principle of Pulse Width Modulation (PWM). The switching regulator uses a feedback control loop to regulate the output voltage by adjusting the on-time of the power switch, which varies the duty cycle of the output voltage. The output voltage is monitored via a sensing resistor or an opto-isolator depending on the application. The output voltage can then be kept at the desired level by varying the switching frequency or the on-time of the MOSFET.

Conclusion

The LT3686IDD#PBF is a low-voltage, high-current, synchronous buck converter DC/DC switching regulator from Linear Technology\'s family of PoL regulators, primarily used in power over Ethernet (PoE) applications. It is designed to step down high input voltages (up to 44V) to low output voltages (as low as 0.7V) with high efficiency, low ripple, and excellent line and load regulation across a wide range of temperatures. It features a maximum power efficiency of up to 93%, is RoHS compliant, and has a typical junction-to-case thermal resistance of 1.2°C/W. It also features an inrush current limit, protection features, and works on the principle of Pulse Width Modulation (PWM).

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