LTC7862HUFD#TRPBF

Voltage - Supply (Vcc/Vdd):	4 V ~ 140 V
Supplier Device Package:	20-QFN (5x4)
Package / Case:	20-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 150°C (TJ)
Control Features:	Current Limit, Enable, Frequency Control, Ramp, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	100%
Frequency - Switching:	50kHz ~ 900kHz
Series:	*
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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LTC7862HUFD#TRPBF is a high-efficiency, wide-input voltage, monolithic multi-phase DC/DC synchronous buck controller. This controller operates with input voltage range from 4.5V to 32V and provides outputs up to 20A with high efficiency, allowing designs to meet the ever-increasing power demands of today’s Point-of-Load power supplies. The LTC7862HUFD#TRPBF is designed with a pre-biased output and is ideal for applications that require built-in bias voltage switching. It has the ability to trade off excess current in one channel for current in another to balance currents across multiple-outputs.The device contains two controllers, each controlling four phases and supporting up to eight high-side or sixteen low-side N-Channel MOSFETs. It is designed to operate in either PFM or PWM mode, allowing users to save power in light-load conditions and achieve improved efficiency in full-load conditions. The LTC7862HUFD#TRPBF includes three independent and programmable feedback inputs. Each controller can be configured for either single-ended current-mode and voltage-mode control, or for differential current-mode and voltage-mode control.The LTC7862HUFD#TRPBF also provides a wide range of protection features for superior system reliability and robustness. Included features are over-current protection, under-voltage lockout, programmable current reverse blocking, over-temperature protection, and programmable peak current limit. It is concisely packaged in a space saving, small QFN-17 package, suitable for automotive and industrial applications.Application FieldThe LTC7862HUFD#TRPBF is a high-efficiency, wide-input voltage regulated DC/DC synchronous buck controller, primarily designed for Point-of-Load applications such as automotive, industrial, and communications systems. This device can be used for applications such as DC-DC converters, LED lighting, DC Motor, Li-ion battery charger, and power supplies with wide input voltage range from 4.5V to 32V. Furthermore, it is ideal for applications that require an adjustable bias voltage switching, due to its pre-biased output.Working PrincipleThe LTC7862HUFD#TRPBF is an integrated monolithic multi-phase DC/DC synchronous buck controller. It operates with input voltage range from 4.5V to 32V and provides outputs up to 20A, allowing example power demands of today’s Point-of-Load power supplies. It contains two controllers, each controlling four phases and supporting up to eight high-side or sixteen low-side N-Channel MOSFETs.The device operates in either PFM or PWM mode, depending on the load current. In PWM mode, the controller operates in voltage-mode or current-mode control depending on the user requirement. In voltage-mode control, it operates to regulate the output voltage to its programmed value. In current-mode control, it operates to regulate the output current to its programmed value. Its current reverse blocking feature prevents the current from flowing from the output to the input during an over-current situation.Other protection features include adjustable over-current protection, adjustable over-temperature protection, adjustable peak current limit, and adjustable under-voltage threshold. It contains a variety of configurable settings including switching frequency range, slope compensation, loop compensation and fault response.ConclusionThe LTC7862HUFD#TRPBF is a monolithic multi-phase DC/DC synchronous buck controller designed with wide input voltage range, high efficiency, and robust protection features. It operates in either PFM or PWM mode, allowing users to trade off power saving in light-loads and improved efficiency in full-load conditions. This device can be used in applications such as LED lighting, DC-DC converters, Li-ion battery chargers and power supplies, automotive, and industrial systems.

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