LTC3872IDDB#TRMPBF

Frequency - Switching:	550kHz
Base Part Number:	LTC3872
Supplier Device Package:	8-DFN (3x2)
Package / Case:	8-WFDFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Current Limit, Enable, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	No
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	2.75 V ~ 9.8 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost
Output Configuration:	Positive
Function:	Step-Up
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LTC3872IDDB#TRMPBF is part of Linear Technology’s family of DC-DC Switching Controllers. It is a current-mode synchronous switching controller. This type of controller is used in industrial and commercial applications to manage power conversion while minimizing losses. Its advanced features make it suitable for variety of applications in portable and stationary power supplies as well as motor drive circuits.

Features

• Current-mode synchronous switching control
• Wide VIN range: 4.5V to 38V
• On-the-Fly Gate Drive
• Adaptive dead time
• External & Internal Soft Start
• Integrated Pre-Biased MOSFET
• Hot Plugging/Short-Circuit Protection
• 3-bit VID Programming

Application Field and Working Principle

LTC3872IDDB#TRMPBF combines all the features necessary to implement high-efficiency, high power density synchronous buck regulator with current-mode control. It supports a wide input voltage range from 4.5V to 38V and can deliver current up to 40A. It employs a pre-biased integrated MOSFET for added reliability and reduced components count. The pre-biased MOSFET provides hot plugging / short-circuit protection, eliminating the requirement of a dedicated external protection circuit. It also allows the user to reduce component count and simplify the power supply design. The switching frequency can be set up to 500kHz. The user can set the desired current limit with the aid of external resistor. The integrated 9-bit DAC provides precise output voltage programming and a 3-bit VID (Voltage Identification) pin simplifies the enabling of multiple output voltages.The LTC3872IDDB#TRMPBF comes with an integrated on-the-fly gate driver, enabling faster loop response and improved per performance. It also comes with an adaptive dead time that allows a wide range of switching frequencies and duty cycles, allowing optimization of efficiency and performance in a wide range of topologies and power supplies. Soft start can be implemented both internally and externally, allowing a more gentle increase in the output voltage.

Conclusion

In conclusion, the LTC3872IDDB#TRMPBF is a versatile current-mode synchronous buck switching controller with a wide range of features that make it suitable for use in industrial and commercial applications. It offers features such as hot plugging / short-circuit protection, on-the-fly gate drive, adaptive dead time, and external & internal soft start. The integrated pre-biased MOSFET and wide input voltage range make it a perfect choice for efficient designs with minimal component count.

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