LTC3851AEUD#PBF

Frequency - Switching:	235kHz ~ 750kHz
Base Part Number:	LTC3851
Supplier Device Package:	16-QFN-EP (3x3)
Package / Case:	16-WFQFN Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Current Limit, Enable, Frequency Control, Soft Start, Tracking
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	99%
Series:	--
Voltage - Supply (Vcc/Vdd):	4 V ~ 38 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 LTC3851AEUD#PBF is a DC/DC switching controller IC designed to boost, invert, or regulate a range of voltages that are different depending on a user’s application requirements. It is suitable for applications such as • High Power Distributed Point-of-Load, • Green Energy Storage Systems, • Automotive & Industrial Power Supplies, and • Low-Voltage 3.3 V to 24 V DC/DC Converters. The advantages of the LTC3851AEUD#PBF that make it suitable for a wide range of applications include variable operating frequency, programmable over-current detection, and current mode operation with adjustable peak current control.

Application Field

The LTC3851AEUD#PBF is designed for highly demanding applications, such as point-of-load power supplies, automotive and industrial power supplies, and battery chargers. It offers the flexibility to operate in buck, boost, and floating voltage mode, enabling it to be used in many different applications.Generally, the LTC3851AEUD#PBF is an ideal solution for applications where legislation limits the number of external components, as it features integrated MOSFET drivers, as well as a wide range of programmable features, making it an excellent choice for space saving designs.The controller can also be used in critical safety-related applications, such as battery chargers, as the integrated over-current and over-temperature shut-down features provide reliable operation.

Working Principle

The LTC3851AEUD#PBF functions by synchronizing the gate of the output MOSFET with the oscillator of the controller IC. Furthermore, the current mode architecture of the controller keeps the duty cycle high when approaching regulation, leading to tighter DC voltage control compared to voltage mode controllers.The LTC3851AEUD#PBF also features adjustable peak current sensing with an error amplifier for the output voltage feedback, and pulse by pulse current limiting if the sensed current is exceeded. The powersave mode further reduces power loss in no-load conditions.

Conclusion

The LTC3851AEUD#PBF is designed to provide efficient, accurate, and reliable control of voltage, current, and power particularly suitable for high power point-of-load, automotive and industrial applications. The programmable features make it an excellent choice for a wide range of applications, and the integrated features save design time and effort.

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