LT3840EFE#PBF

Frequency - Switching:	50kHz ~ 1MHz
Base Part Number:	LT3840
Supplier Device Package:	28-TSSOP-EP
Package / Case:	28-TSSOP (0.173", 4.40mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Frequency Control, Power Good, Soft Start, Tracking
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99%
Series:	--
Voltage - Supply (Vcc/Vdd):	2.5 V ~ 60 V
Output Phases:	1
Number of Outputs:	1
Topology:	Buck
Output Configuration:	Positive or Negative
Function:	Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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Introduction

The LT3840EFE#PBF is a high-performance DC/DC switching controller designed to simplify the design of isolated and non-isolated, high-efficiency step down power supplies. LT3840EFE#PBF combines a comprehensive suite of integrated features with a variety of external components to simplify the design of a wide variety of high power density, high-efficiency power supplies.

Application Fields

The LT3840EFE#PBF is an ideal power source for a variety of demanding applications including telecom and computing infrastructure, consumer industrial, automotive, and other applications with high power density requirements. It offers outstanding efficiency levels and provides optimized control of output voltage and current in both continuous and discontinuous modes of operation. The LT3840EFE#PBF is also capable of providing complete protection for the power source, load, and the input power source.Additionally, the LT3840EFE#PBF is suitable for applications where extremely tight regulation and performance is required, such as in medical applications. It can also provide accurate control of output currents and is compatible with a wide variety of external components to support a single- or multi-channel switching solution.

Working Principle

The LT3840EFE#PBF is a switching controller, which uses a combination of an internal voltage loop and an external current loop to control the duty cycle. The LT3840EFE#PBF has an internal voltage reference and an on-board VCO that generates pulses to feed into the internal power controller. The power controller detects the output voltage and current and adjusts the duty cycle accordingly.The LT3840EFE#PBF also integrates several features to ensure secure and reliable operation including over-voltage protection, over-current protection, and over-temperature protection. The LT3840EFE#PBF also includes several features to ensure reliable operation, such as monitoring of load current and input voltage, monitoring of temperature and switching frequency control.The LT3840EFE#PBF is designed to provide high performance and immunity to interference. It has a wide input voltage range of 4.5V-24V, a wide duty cycle range of 0.1%-99.9% and can operate up to 25MHz. The LT3840EFE#PBF also features an adjustable switching frequency of 0Hz to 25MHz, and an adjustable switching frequency spread between 0% to 20%.

Conclusion

The LT3840EFE#PBF is a high-performance DC/DC switching controller designed to simplify the design of isolated and non-isolated, high-efficiency step down power supplies. It is suitable for applications where extremely tight regulation and performance is required, such as in medical applications. The LT3840EFE#PBF is equipped with an internal voltage reference and an on-board VCO for generating pulses to feed the internal power controller. It also integrates several features to ensure secure and reliable operation such as over-voltage protection, over-current protection, and over-temperature protection. Overall, the LT3840EFE#PBF is an ideal solution for applications with high power density requirements.

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