LTC3862EGN-2

Voltage - Supply (Vcc/Vdd):	5.5 V ~ 36 V
Supplier Device Package:	24-SSOP
Package / Case:	24-SSOP (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Frequency Control, Phase Control, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	No
Duty Cycle (Max):	96%
Frequency - Switching:	75kHz ~ 500kHz
Series:	--
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Part Status:	Obsolete
Packaging:	Tube

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Introduction

The LTC3862EGN-2 is a switching converter controller from Linear Technology Corporation. The device regulates the current and the output voltage, providing full protection from overvoltage, short circuit, undervoltage, and overcurrent.

Application Field

The LTC3862EGN-2 is designed for high power DC-DC switching converter applications such as synchronous stepped down converters, forward converters, and flyback converters. It can be used to supply current up to very high currents.The device supports a wide variety of topologies and features soft start, adjustable frequency, programmable undervoltage lockout, feedback sampling, and fault protection.The LTC3862EGN-2 is ideal for providing high power, high reliability, and efficiency power supplies. It is suitable for a variety of applications including server, non-PC graphics cards, communications, automotive, and consumer electronics.

Working Principle

The LTC3862EGN-2 works by using two voltage foldback and overvoltage protection circuits to ensure the steady output voltage, and relative current limiting. It also has a programmable overcurrent protection (OCP) circuit.The OCP circuit works by constantly monitoring the output voltage and comparing it to an internal reference. If the output voltage goes beyond a predetermined value, the device will shut down. The LTC3862EGN-2 operates in Pulse Width Modulation (PWM) mode and is controlled by an internal modulation scheme. The device has an adjustable switching frequency, modulation frequency, current limit sensing time constant, and start-up timer.The LTC3862EGN-2 measures on-time and off-time of the switching gate drive. It also regulates the output voltage while keeping the current within the limit.

Conclusion

The LTC3862EGN-2 is an efficient, high power dc-dc switching converter controller from Linear Technology Corporation. It is suitable for high power, high reliability, and efficiency applications such as servers, graphics cards, communications, automotive, and consumer electronics. It supports a wide variety of topologies and features soft start, adjustable frequency, programmable undervoltage lockout, feedback sampling, and fault protection. The device also has voltage foldback and overvoltage protection circuits as well as a programmable overcurrent protection (OCP) circuit to ensure the steady output voltage. The device operates in Pulse Width Modulation (PWM) mode and is regulated by an internal modulation scheme.

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