LT3745EUJ

Voltage - Output:	36V
Supplier Device Package:	40-QFN (6x6)
Package / Case:	40-WFQFN Exposed Pad
Mounting Type:	Surface Mount
Operating Temperature:	-40°C ~ 125°C (TJ)
Applications:	Backlight, Signage
Dimming:	PWM
Frequency:	200kHz ~ 1MHz
Current - Output / Channel:	75mA
Series:	--
Voltage - Supply (Max):	55V
Voltage - Supply (Min):	6V
Number of Outputs:	16
Internal Switch(s):	No
Topology:	Step-Down (Buck)
Type:	DC DC Controller
Part Status:	Obsolete
Packaging:	Tube

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Introduction

LT3745EUJ is a LED driver and PMIC (power management integrated circuit) from Linear Technology Corporation. It is one of the most advanced power management solutions available in the market. The device integrates both power MOSFET and high-efficiency driver stages within a single package to provide high efficiency, cost savings, and ease of use in LED lighting applications.

Application Fields

LT3745EUJ is an ideal power management solution for a wide range of LED lighting applications, including but not limited to general purpose and residential lighting, automotive and industrial lighting, and power management applications.In general purpose and residential lighting applications, the LT3745EUJ can be used to control the brightness and color of LED lighting fixtures. It can also be used to reduce energy consumption in a variety of applications, such as emergency lighting, home or office lighting, and accent lighting.In automotive and industrial lighting applications, the LT3745EUJ can be used to optimize the efficiency and performance of LED lighting systems by providing accurate current regulation, low cost and high reliability. It can also be used to reduce energy consumption in automotive and industrial lighting applications, such as headlights, turn signals, and parking lights.The LT3745EUJ is also suitable for a variety of power management applications, including the regulation of LED driver current, power conditioning, and power factor correction (PFC).

Working Principle

The LT3745EUJ is an integrated circuit (IC) based on a low-cost single-stage buck-boost converter. It is designed to accept an input voltage of 4.5V to 24V, allowing for a wide range of input sources. It features a continuous conduction mode (CCM) control topology to provide high efficiency and a low standby current consumption of only 0.1mA.The LT3745EUJ integrates two power MOSFETs and two high-efficiency driver stages, resulting in a total driver loss of only 1% at 1A of load current. The device also offers high efficiency up to 96% and a wide output voltage range from 0.8V to 24V. It also features a current limit setting to protect against over-current events and a low-battery shut-down voltage to prevent the device from operating at too low of a voltage.The LT3745EUJ supports dimmable applications, with an adjustable output current ranging from 50mA to 3A. It can also support short-circuit protection and surge protection, as well as thermal shutdown to protect the device from high temperatures.

Conclusion

LT3745EUJ is a high-efficiency, low-cost, single-stage buck-boost LED driver IC from Linear Technology Corporation. It integrates two power MOSFETs and two high-efficiency driver stages within a single package, resulting in a total driver loss of only 1% at 1A of load current. The device can be used in a wide range of LED lighting and power management applications, including general purpose and residential lighting, automotive and industrial lighting, and power management applications. Moreover, it features dimmable, short-circuit protection, surge protection, and thermal shut-down features to protect the device from hazardous conditions.

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