LT3757IMSE#TRPBF

Frequency - Switching:	100kHz ~ 1MHz
Base Part Number:	LT3757
Supplier Device Package:	10-MSOP-EP
Package / Case:	10-TFSOP, 10-MSOP (0.118", 3.00mm Width) Exposed Pad
Operating Temperature:	-40°C ~ 125°C (TJ)
Control Features:	Enable, Frequency Control, Soft Start
Serial Interfaces:	--
Clock Sync:	Yes
Synchronous Rectifier:	No
Duty Cycle (Max):	--
Series:	--
Voltage - Supply (Vcc/Vdd):	2.9 V ~ 40 V
Output Phases:	1
Number of Outputs:	1
Topology:	Boost, Flyback, SEPIC
Output Configuration:	Positive and Negative
Function:	Step-Up, Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Active
Packaging:	Tape & Reel (TR)

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Introduction

The LT3757IMSE#TRPBF is a high-current, wide Vin multi-phase DC/DC controller that allows for fast transient response and low output ripple. It is well-suited for a wide range of power applications including computing, server, telecom, automotive, and industrial systems. This DC/DC controller features two fixed switch-mode current-mode step-up controllers. The two controllers can be independently configured for PWM, current-mode, or burst mode operation, allowing for efficient power-level control across multiple output voltage levels. Additionally, the LT3757IMSE#TRPBF allows for full cycle by-cycle current sharing, enabling up to 8-phase applications with up to 25A per phase.

Application field

The LT3757IMSE#TRPBF is a versatile and efficient DC/DC controller suitable for a variety of power applications. Its wide Vin range and high current capability make it ideal for applications with high power demand and low output ripple. One of the primary application fields is within high-density computing equipment. In these types of applications, the LT3757IMSE#TRPBF features high power efficiency and fast transient response to support high-performance CPU, GPU, and memory cores. Additionally, the LT3757IMSE#TRPBF is suitable for automotive, server, and industrial systems. In automotive systems, it can be used in fuel-injected, hybrid, and electric vehicles and supports applications such as motor control, DC-DC conversion, and power management. In telecom equipment, the LT3757IMSE#TRPBF features fast transient and load-sharing responses to support switching amplifiers, POEs, and galvanic isolators. Outside of power application sectors, the LT3757IMSE#TRPBF can also be employed in sensor, LED lighting, and solar panel systems. These applications require high power efficiency and fast transient response, making them an ideal target for the LT3757IMSE#TRPBF.

Working Principle

The LT3757IMSE#TRPBF follows the principles of fixed switch-mode current-mode step-up controllers. This means that it regulates the input voltage to a fixed and constant output voltage according to a pre-programmed setpoint, then regulates the current accordingly. Once the desired output has been achieved, the LT3757IMSE#TRPBF maintains the voltage by adjusting the duty cycle and current limit accordingly, resulting in a stable output voltage. The LT3757IMSE#TRPBF also features a multi-phase current sharing feature. This feature allows for the current to be evenly split among the multiple channels, resulting in improved power efficiency and faster transient response. Additionally, this feature enables the LT3757IMSE#TRPBF to support up to 8-phase applications with up to 25Amps per phase. This has the advantage of allowing for higher output currents, allowing for increased system power density, as well as improved surge current protection. Finally, the LT3757IMSE#TRPBF features adjustable soft-start. This feature allows for the output voltage to be slowly ramped up or down, reducing the risk of output inrush currents and over-voltage conditions. Additionally, it helps to reduce output ripple, further improving overall power quality.

Conclusion

The LT3757IMSE#TRPBF is a high-current, wide Vin multi-phase DC/DC controller designed for applications that require fast transient response and low output ripple. Its adjustable soft-start feature allows for smooth output voltage ramp-up or ramp- down and reduces the risk of over-voltage conditions. Additionally, its multi-phase current-sharing feature enables up to 8-phase applications with up to 25A per phase, allowing for increased system power density. It is well-suited for a wide range of power applications, including high-density computing equipment, automotive systems, telecom systems, and industrial systems.

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