LT3791HFE-1#PBF

Frequency - Switching:	200kHz ~ 700kHz
Base Part Number:	LT3791
Supplier Device Package:	38-TSSOP-EP
Package / Case:	38-TFSOP (0.173", 4.40mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 150°C (TJ)
Control Features:	Enable, Frequency Control, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	Yes
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	4.7 V ~ 60 V
Output Phases:	2
Number of Outputs:	2
Topology:	Buck-Boost
Output Configuration:	Positive
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tube

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The LT3791HFE-1#PBF is a high efficiency, step-up DC to DC switching controller that combines PFC and a 600V, 40mA buck converter into a single monolithic IC. It is a one-package device that can be used to generate a wide range of output voltages, from 2V to 48V.The LT3791HFE-1#PBF can be used in many applications including low power point-of-load (POL) converters, off-line converters with wide range of output voltages, mobile and automotive power systems, and more.

Application Field

The LT3791HFE-1#PBF is ideal for a wide range of point-of-load, dc/dc converter applications, including:- Automotive systems- Low power, isolated high current power systems- Industrial and telecom power systems- Network transceiver modulesThe LT3791HFE-1#PBF can be used to deliver high efficiency, small size, and low cost in a wide range of adapter, charger, or other dc/dc converters.

Working Principle

The LT3791HFE-1#PBF uses a combination of Peak Current Mode Control (PCMC) and constant on-time control. PCMC provides fast transient response, while the constant on-time control provides excellent line and load regulation as well as low current ripple on the output side.The LT3791HFE-1#PBF uses a proprietary algorithm, enabling it to power up into a pre-bias state and dynamically transition into a regulated state when the output voltage is reached. This adaptive behavior minimizes the start-up time of the DC/DC converter.The LT3791HFE-1#PBF also features an integrated PFC controller for universal power input. The PFC controller can be operated in Discontinuous Conduction Mode (DCM) or Continuous Conduction Mode (CCM), enabling the design engineer to select the correct topology for their application.

Conclusion

The LT3791HFE-1#PBF is a high efficiency, step-up DC to DC switching controller that provides a high level of integration, featuring a 600V, 40mA buck converter and a PFC controller in a single package. The device is ideal for a wide range of point-of-load and dc/dc converter applications including automotive systems, low power, isolated high current power systems, industrial and telecom power systems, and network transceiver modules. The LT3791HFE-1#PBF uses a combination of PCMC and constant on-time control, as well as an integrated PFC controller, to provide an efficient and cost effective solution.

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