LTC3859ALHUHF#PBF

Frequency - Switching:	115kHz ~ 835kHz, 350kHz ~ 535kHz
Base Part Number:	LTC3859
Supplier Device Package:	38-QFN (5x7)
Package / Case:	38-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 150°C (TJ)
Control Features:	Enable, Frequency Control, Power Good, Soft Start, Tracking
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99%, 100%
Series:	--
Voltage - Supply (Vcc/Vdd):	4.5 V ~ 38 V
Output Phases:	2
Number of Outputs:	3
Topology:	Buck, Buck-Boost, SEPIC
Output Configuration:	Positive
Function:	Step-Down, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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PMIC - Voltage Regulators - DC DC Switching Controllers

The LTC3859ALHUHF#PBF is an advanced DC/DC switching controller with integrated operations that are designed to help simplify regulator design. It is suitable for applications which require higher power outputs, precise regulation, and low standby current. This device helps to improve the power efficiency of switching power supplies by utilizing user-controlled boundary conduction mode (BCM), an adaptive on-time control algorithm, and an adjustable slope compensation technique.

Features and Functions

The LTC3859ALHUHF#PBF is a high-performance DC/DC switching controller that has a number of features and functions to optimize the efficiency, reliability, and size of the power system design. The device is designed to provide excellent load regulation and transient response. It also supports a wide range of voltage converters such as buck, boost, SEPIC, and inverting. In addition, the device supports dual-loop current-mode architecture and includes a high-side current sense amp, a low-side current sense amp, and a voltage sense amp, which helps to enable precise regulation. The LTC3859ALHUHF#PBF also features a wide range of protection functions which helps to protect the device against over-current, over-temperature, input under-voltage, output over-voltage, and short-circuit faults. Furthermore, the device features an adaptive on-time control algorithm and an adjustable slope compensation technique which helps to eliminate the need for loop compensation components and minimize output voltage ripple. As such, the device improves power efficiency by operating in the BCM, thus providing lower standby power.

Applications

The LTC3859ALHUHF#PBF is mainly utilized in various switched mode power supply designs. Owing to its robust and accurate regulation, it is extensively used in high-power applications such as telecom systems, server systems, industrial control systems, solar energy systems, battery energy systems, and automotive systems. Moreover, the device can be applied in general DC/DC switching applications including Point of Load (POL) converters, LED drivers, and adjustable voltage converters. It is also well suited for various other designs such as active clamps, converters with low-side switched FETs, synchronous buck converters, and flyback converters.

Working Principle

The LTC3859ALHUHF#PBF operates as a current-mode DC/DC switching regulator in order to provide consistent output voltage from the input voltage. The device works by monitoring the input voltage and output voltage, such that if the output voltage tends to decrease, it will rapidly switch on its associated FET, thus enhancing the input signal. As the output current reduces, the FET will slowly switch off, hence increasing the output voltage upto the on set point. This switching process is repeated continuously until the desired output voltage is achieved, thus ensuring accuracy and fast load regulation. Moreover, by utilizing adaptive on-time control algorithms, without the need for any loop compensation components, this device helps to reduce output voltage ripple and provide excellent line and load regulation. Additionally, the device has the ability to sense the input voltage, output voltage, high-side current, and low-side current. It then controls the floating power-switch FETs, thus converting the energy in the fixed input to a regulated output voltage with high efficiency.

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