LTC3891HUDC#TRPBF

Frequency - Switching:	105kHz ~ 835kHz, 350kHz ~ 535kHz
Base Part Number:	LTC3891
Supplier Device Package:	20-QFN (3x4)
Package / Case:	20-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 150°C (TJ)
Control Features:	Current Limit, Enable, Frequency Control, Power Good, Soft Start, Tracking
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99%
Series:	--
Voltage - Supply (Vcc/Vdd):	4 V ~ 60 V
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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Introduction

The LTC3891HUDC#TRPBF is a buck-boost switching controller designed to provide high accuracy regulation for a wide range of voltage regulation applications. The chip is designed to provide maximum flexibility to the user as it can support multiple topologies such as synchronous and nonsynchronous buck-boost, as well as current-mode operation and low quiescent current operation. The LTC3891HUDC#TRPBF has a programmable power-on reset and can operate from 3.2V up to 38V. It also provides overvoltage protection, undervoltage protection, overcurrent protection, and overtemperature protection to ensure safe operation.

Application Field

The LTC3891HUDC#TRPBF is suitable for a wide range of application in portable, automotive, industrial and consumer applications. Its flexible operation allows it to be used as a voltage converter, buck-boost supply, battery charger, dc-dc converter, or as a multi-mode converter. It is also suitable for applications such as point-of-load regulation and powering a wide range of analog, digital, and FPGA circuits.The LTC3891HUDC#TRPBF can also be used for distributed power architectures such as Power-over-Ethernet (PoE) applications. The chip is designed for a low component count and high reliability, which makes it ideal for applications with space and energy constraints.

Working Principle

The LTC3891HUDC#TRPBF is a switching controller that uses pulse width modulation (PWM) to regulate the voltage output of a converter or switching power supply. With its intelligent control loop, the LTC3891HUDC#TRPBF can independently sense and regulate both the positive and the negative output voltages, allowing for both synchronous and nonsynchronous, low quiescent current operations. An integrated current limit protect the load and converter in case of output overloads. The LTC3891HUDC#TRPBF also includes a programmable power-on reset (POR), as well as overvoltage, undervoltage, overcurrent, and overtemperature protection to ensure safe operation.

Conclusion

The LTC3891HUDC#TRPBF is a versatile buck-boost controller that can be used for a wide range of applications. Its flexible operation allows it to be used for distributed power architectures, PoE applications, DC-DC converters, and as a multi-mode converter. It is also suitable for point-of-load regulation and powering a variety of analog, digital, and FPGA circuits. It is designed for low component count and high reliability, making it ideal for space and energy constrained applications. The LTC3891HUDC#TRPBF uses PWM to regulate the output voltage and has an integrated current limit to protect the load and the converter. It also provides a programmable power-on reset, as well as protection from overvoltage, undervoltage, overcurrent, and overtemperature.

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