LT3790IFE#TRPBF

Frequency - Switching:	200kHz ~ 700kHz
Base Part Number:	LT3790
Supplier Device Package:	38-TSSOP-EP
Package / Case:	38-TFSOP (0.173", 4.40mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Frequency Control, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	4.7 V ~ 60 V
Output Phases:	2
Number of Outputs:	2
Topology:	Buck-Boost
Output Configuration:	Positive
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

Power Management Integrated Circuit (PMIC) is an integrated circuit (IC) that provides the control of power components to electronic systems. With the development of electronic systems, the complexity and power management requirements of the system are increasing. PMIC products are becoming more integrated and comprehensive and have become an essential part of modern electronic systems. DCDC switching controllers are one of the most important components of the PMIC. This article aims to discuss the application field and working principle of LT3790IFE, the flagship DCDC switching controller in the LT3790 family, which adds a new member to the list of available DCDC controllers.

LT3790IFE Overview

The LT3790IFE is a specialist DC-DC switching controller for flyback, forward and SEPIC designs. It offers six integrated, low-voltage DC to DC control channels, each capable of providing up to 1A output current and programmable switching parameters. This makes it an ideal choice for a wide range of applications, from general-purpose power supply control to power conversion in high power density systems. The LT3790IFE also offers a rich range of features, including programmable sequencing, fault protection, and internal power-on reset (POR) protection. Moreover, this chip can both generate and terminate includes external MOSFETs, making it easier for designers to build the power conversion circuitry quickly and efficiently.

Application Field

The LT3790IFE can be used in a wide range of applications that require a high current and small form factor. It is also suitable for high current applications where a low number of control lines are required, such as secondary nodes in computer systems, power modules and automotive systems. The current limits can be programmed independently for each output and the fault protection circuitry support both open drain and open source configurations. Additionally, the device supports a wide range of input voltages and can be operated with an input voltage between 8V and 18V. Furthermore, the LT3790IFE provides a wide range of features which make it an attractive choice for many applications. It integrates several peripherals such as programmable sequencers, fault protection, and POR protection. It also has a built in FET driver to generate and terminate the MOSFETs, and a closed-loop compensation network to accurately adjust the control parameters over a wide range of conditions.

Working Principle

The LT3790IFE chip operates based on a frequency-mode control method which uses a fixed frequency and current-mode control. The current mode control measures the inductor current and adjusts the duty cycle accordingly, allowing the load current to accurately follow the required step load. The frequency mode control implements an analog multiplier loop where the frequency is varied based on the output voltage. This helps in regulating the output voltage more accurately.The LT3790IFE operates on two levels of protection. It has an over-current protection (OCP), which will reduce the output current to a safe level if the load current exceeds a predetermined limit. It also has an over-voltage protection (OVP), which reduces the output voltage when the output exceeds the configured level. Both protections are important to ensure the safety of the device and the system.

Conclusion

The LT3790IFE DC to DC switching controller is a versatile device with a wide range of applications. It can be used in a wide range of situations, from general-purpose power supply control to power conversion in high power density systems. The device is also equipped with a rich range of features such as OCP, OVP, POR protection and programmable sequence capabilities. In summary, the LT3790IFE is a reliable and powerful DC-DC switching controller that is suitable for a variety of applications.

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