LTC3862HGN-2#PBF

Frequency - Switching:	75kHz ~ 500kHz
Base Part Number:	LTC3862
Supplier Device Package:	24-SSOP
Package / Case:	24-SSOP (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 150°C (TJ)
Control Features:	Enable, Frequency Control, Phase Control, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	No
Duty Cycle (Max):	96%
Series:	--
Voltage - Supply (Vcc/Vdd):	5.5 V ~ 36 V
Output Phases:	2
Number of Outputs:	2
Topology:	Boost, SEPIC
Output Configuration:	Positive
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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LTC3862HGN-2#PBF Application Field and Working Principle

The LTC3862HGN-2#PBF, a package of high-frequency, high-efficiency synchronous DC/DC Controller IC, is considered a sophisticated and powerful tool for specifying and building an optimal DC/DC converter with excellent performance. Sub-microsecond response, full cycle-by-cycle current limit and tight output voltage regulation become some of the most wide-spread applications for LTC3862HGN-2#PBF.

Application Field

LTC3862HGN-2#PBF is applicable for multiple demanding applications in electronic equipment, particularly for those which needs seamless, consecutive switching of voltage and current. As an example, in industrial electronics the product is deployed as a power generator in AC/DC converters, while in automotive industry it can be used to drive synchronous rectifiers and step-down converters. The product is ideal for various applications demanding tight regulation of output current and output voltage, such as Voltage Controlled Oscillators (VCOs) or cellular phones. LTC3862HGN-2#PBF is widely applicable for applications based on data centers and other advanced computing solutions with extreme power requirements.

Working Principle

LTC3862HGN-2#PBF is a chip with two major blocks: synchronous rectifier and the controller. The rectifier circuitry components manage conversion of alternating current (AC) input voltage into direct current (DC) output voltage. The implementation of switching rectifiers allows for achievement of high conversion efficiency in extremely dense packages requested by demanding applications. The controller block performs monitoring and control of the converter parameters, such as output voltage, input voltage, and output current.The device defaults to pulse width modulation (PWM) mode when power is applied, which controls output voltage within a certain range. If load changes or temperature drifts the output voltage adjustment is required – then the device automatically changes to the current mode of operation, which allows for a faster response of voltage control loop. This mode keeps output current constant by actively controlling converter duty cycle.LTC3862HGN-2#PBF also allows for embedment of the Frequency Reduction Mode (FRM) in order to further optimize the performance of DC/DC converter. The FRM is applied when input voltage is greater than 4.4V and can be disabled if necessary. The duty cycle of the controller is precisely adjustable over the entire range and is determined by voltage divider across resistor sense pins. If external component values are configured properly, the performance of various DC/DC converter schemes can be tuned accordingly. To determine the value of output voltage feedback, the external pins VFB and GND must be connected to feedback resistor R1 and R2. The voltage at VFB is then compared with an internal reference voltage of the controller. In terms of over-current protection, LTC3862HGN-2#PBF can be configured by integration of several options – a single N-channel MOSFET or an inner series pass transistor with external low-side N-channel MOSFET.

Conclusion

LTC3862HGN-2#PBF is a sophisticated and powerful DC/DC Controller IC. It offers superior performance in a wide variety of demanding applications, such as AC/DC converters, Voltage Controlled Oscillators and Voltage Regulators. Its circuitry blocks include synchronous rectifier and controller, which perform switching and PWM mode operation respectively. With highly adjustable settings and implementation of Frequency Reduction Mode (FRM), the performance of DC/DC converter can be easily and confidently tuned. The product allows for tight regulation of output current and output voltage in multiple nodes, thus making it a primary choice for multiple applications.

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