LTC3834EFE#PBF

Frequency - Switching:	250kHz ~ 530kHz
Base Part Number:	LTC3834
Supplier Device Package:	20-TSSOP-EP
Package / Case:	20-TSSOP (0.173", 4.40mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Phase Control, Power Good, Soft Start, Tracking
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99.4%
Series:	--
Voltage - Supply (Vcc/Vdd):	4 V ~ 36 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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Introduction

The LTC3834EFE#PBF is a synchronous high efficiency, step-down switching regulator, available in a thermally efficient 28-Lead TSSOP package. Developed by Linear Technology Corporation, the LTC3834EFE#PBF is an excellent choice for a variety of DC-to-DC buck-mode applications involving low noise and relatively low current levels. Whether you need adjustable or fixed output voltage, the LTC3834EFE#PBF is a great way to regulate voltage in a power supply design or a data processing application. This article will discuss the application fields, working principle and features of the LTC3834EFE#PBF.

Application Fields

The LTC3834EFE#PBF can be used in a variety of applications, such as data processing applications, ADC power supplies, voltage monitoring systems, synchronous buck converter, low-dropout (LDO) applications and other low noise power supplies. The LTC3834EFE#PBF can be used in a variety of voltages for the input and output. It can accept an input voltage ranging from 4.5V to 35V. The output voltage can be set up in the range of 0.8V to 25V. The regulator\'s output voltage can be monitored, with adjustable tolerance levels, using prescaler setting and voltage reference inputs. The LTC3834EFE#PBF can also be used in power supply design or a data processing application, including graphic card and motherboards or gaming consoles. Additionally, it is ideal for general-purpose cellular base stations and other power supplies where low voltage, low losses, and long battery life are a priority.

Working Principle

The LTC3834EFE#PBF working principle is based on a synchronous buck controller. It is designed with a built-in loop compensation, so it does not require external compensation components. The LTC3834EFE#PBF regulates the output voltage by sensing the voltage at the feedback pin and making adjustments accordingly.The basic working principle is simple; when the input voltage is turned on and the load is connected, the output voltage begins to rise. When the output rises to a certain value, the feedback loop detects this and adjusts the duty cycle of the switching voltage regulator, thus controlling the output voltage.The LTC3834EFE#PBF allows you to select the switching frequency, either using a user-settable prescaler or by employing the optional EFC pin. Furthermore, the LTC3834EFE#PBF can be used in constant frequency and burst mode operation, which is ideal for applications demanding long battery life and low noise operation such as mobile phones.

Features

The LTC3834EFE#PBF is equipped with a wide range of features to ensure reliable and efficient operation. The step-down regulator features synchronous rectification which provides excellent efficiency even at low output currents. The device has an integrated pulse-width modulation (PWM) control loop for better line and load regulation. Furthermore, adjustable rise and fall times enable flexible output voltage snubbing.The LTC3834EFE#PBF also has adjustable soft-start and low-battery operation voltages. In addition to adjustable oscillator frequency, it offers cycle-by-cycle current limit and programmable current limit window that can limit peak inductor current. The device has an internal power-good indicator for proper output voltage monitoring.Finally, the device features power saving features, such as automatic low-power mode or low-duty-cycle mode to reduce power losses at light loads. It is available in a thermally enhanced TSSOP package and includes under-voltage lockout and thermal shutdown protection.

Conclusion

The LTC3834EFE#PBF is a versatile and efficient step-down switching regulator from Linear Technology Corporation. It is suitable for a variety of DC-to-DC buck mode applications and offers an adjustable output voltage range of 0.8V to 25V, as well as adjustable switching frequency set via a prescaler or EFC pin. The device features low noise operation and low power losses, thanks to its synchronous rectification, adjustable rise and fall times and power saving feature. Finally, the device offers various protection features including under-voltage lockout and thermal shutdown.

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