LT3757AEMSE#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 LT3757AEMSE#TRPBF is an synchronous boost controller from Linear Technology integrated with the ability to generate regulated outputs of up to 10V at 5A from a regulated input of 2.5V to 8V. This device is designed to provide high efficiency with a customizable architecture. The LT3757AEMSE#TRPBF is ideal for a wide variety of applications. This device is part of the PMIC - Voltage Regulators - DC DC Switching Controllers family.

Application Field

The LT3757AEMSE#TRPBF is a versatile and customizable DC-DC boost converter, providing excellent performance in applications ranging from low voltage, industrial and automotive applications. Its range of capabilities makes it ideal for applications needing high power and light weight designs such as portable battery operated devices and power management of micro-controllers, FPGA and computer boards. The device can be used in a wide range of battery-powered systems such as mobile phones and other portable devices, and can be easily integrated into existing designs. It is also well-suited for powering medical, aviation and military systems, as well as automotive on-board systems.

Working Principle

The LT3757AEMSE#TRPBF is an integrated DC-DC boost converter that is optimized to generate an outputs of up to 10V at 5A from regulated inputs of 2.5V to 8V. The device includes an integrated power switch, dual-mode interleaved detection circuitry, and an advanced digital power state machine to provide a high degree of flexibility and configurability. Its integrated boost switch also features automatic current limiting and short circuit protection, enabling entire power supply designs to be simplified.The device operates in a fixed frequency two-phase interleaved, pulse width modulation (PWM) mode. In each phase, one switch is operated in buck mode, the other in boost mode. By operating the controllers in an interleaved configuration, the total output ripple is minimized and noise is spread more evenly over the entire input capacitor circuit. In order to regulate the output voltage, an external resistor-divider can be connected to the FB pin and the voltage on it is monitored by the controller. When the connected resistor-divider changes the magnitude of the feedback voltage, the output remains constant. Additionally, the device also includes a soft-start feature that can be used to reduce the output voltage overshoot during start-up.

Conclusion

The LT3757AEMSE#TRPBF is a powerful controller from Linear Technology that enables the generation of regulated DC-DC outputs from 2.5V to 8V inputs. It features a two-phase interleaved configuration that provides excellent efficiency, smooth output ripple, and adjustable output voltage. The device also includes an integrated power switch and digital power state machine for added flexibility and configurability. It is suitable for applications such as powering microcontrollers, FPGAs and computer boards. It is also well suited for industrial, automotive, medical, avionics and military applications.

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