LTC3890IUH#PBF

Frequency - Switching:	105kHz ~ 835kHz, 350kHz ~ 535kHz
Base Part Number:	LTC3890
Supplier Device Package:	32-QFN (5x5)
Package / Case:	32-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Current Limit, Enable, Frequency Control, Phase Control, Power Good, Soft Start, Tracking
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99%
Series:	PolyPhase®
Voltage - Supply (Vcc/Vdd):	4 V ~ 60 V
Output Phases:	2
Number of Outputs:	2
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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Introduction

LTC3890IUH#PBF is an advanced, high performance DC/DC Switching synchronous Buck controller developed by Linear Technology Corporation. The device offers high efficiency operation across a wide range of output voltages. The LTC3890IUH#PBF is designed for applications requiring the highest levels of power conversion efficiency, performance, and switchable output voltage control. The device is used in various applications such as portable devices, networked systems, automotive electronics, and industrial applications.

Applications of LTC3890IUH#PBF

The LTC3890IUH#PBF offers high performance and reliability in a small package. It is suitable for a wide range of applications such as power amplifiers, radio frequency (RF), variable speed drives (VSDs), networking systems, automotive systems, notebook computers, industrial monitor systems, and portable device power supplies.

Power Amplifiers:

The LTC3890IUH#PBF is widely used for power amplifier applications. It is ideal for applications where high efficiency and ease of control are desired. It provides peak current limiting, pulse skipping, and adjustable soft-start features to protect the amplifier from over-current, over-voltage, or over-temperature conditions.

RF Applications:

The LTC3890IUH#PBFis ideal for radio frequency (RF) applications due to its low noise and high conversion efficiency. It can be used to power radio transmitters, radio receivers, and base stations.

Variable Speed Drives (VSDs):

The LTC3890IUH#PBF is an ideal choice for variable speed drive (VSD) applications. It has a fixed frequency synchronous Buck topology which eliminates the need for variable-speed drive controllers. It also has a built-in programmable switching frequency and its pulse skipping feature can help to reduce power dissipation.

Networking Systems:

The LTC3890IUH#PBF is ideal for powering networking systems with high efficiency and low noise design. Its high voltage capability and wide-output range make it suitable for applications from 10 to 56V.

Automotive Systems:

The LTC3890IUH#PBF can be used for powering automotive systems such as on-board controllers, audio amplifiers, and lighting. Its programmable frequency and soft-start features make it ideal for use in these applications.

Notebook Computers:

The LTC3890IUH#PBF can be used in notebook computers due to its high efficiency and power savings. Its built-in pulse skipping feature helps to reduce power dissipation and can extend battery life.

Industrial Monitor Systems:

The LTC3890IUH#PBF is ideal for powering industrial monitor systems due to its low output noise and wide-input range. Its high efficiency and current sensing capabilities allow it to monitor power usage in real-time and help to optimize system performance.

Portable Device Power Supplies:

The LTC3890IUH#PBF is perfect for powering portable device power supplies due to its wide range of output settings and its unmatched performance and efficiency. It has the ability to sense current and can be used to regulate the power usage of these devices.

Working Principle of LTC3890IUH#PBF

The LTC3890IUH#PBF works on the principle of synchronous Buck topology. In this topology, the input voltage is regulated by synchronizing the switching times of the two switches, a low side switch and a high side switch, which are connected in series with one another. When the voltage at the output terminal is greater than the voltage at the input terminal, the low side switch is turned ON and the high side switch is turned OFF. As the output voltage decreases, the high side switch is turned ON and the low side switch is turned OFF. The switching is controlled by an internal oscillator or an external voltage signal. The device also has an internal error amplifier to regulate the output voltage.The device features an adjustable, high-frequency soft start, pulse skip mode, and adjustable current limit, which can be adjusted via external components. It is capable of regulating the output voltage across a wide range, from 0.5V to 5.5V. The device also has an adjustable frequency and programmable switching frequency that can be adjusted via external timing components. The device has an integrated internal MOSFET driver to drive the external FETs.

Conclusion

The LTC3890IUH#PBF is an advanced, high performance DC/DC Switching synchronous Buck controller developed by Linear Technology Corporation. It is suitable for various applications such as power amplifiers, radio frequency (RF), variable speed drives (VSDs), networking systems, automotive systems, notebook computers, industrial monitor systems, and portable device power supplies. The device operates on the principle of synchronous Buck topology and features adjustable soft start, pulse skipping, adjustable frequency, programmable switching frequency, and adjustable current limit. It is suitable for applications requiring the highest levels of power conversion efficiency, performance, and switchable output voltage control.

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