LM2704MFX-ADJ

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Among Power Management ICs (PMICs), LED Drivers can provide the power and protection needed by LEDs and LCD backlights while interfacing with the system power supplies. The LM2704MFX-ADJ, a feature-rich 4-channel constant current LED driver with LED voltage limitation is capable of providing analog and PWM control to LED brightness. This application note will cover the LM2704MFX-ADJ’s features, application field and working principle.

Features

The LM2704MFX-ADJ combines a wide range of features in one single-chip controller, enabling power efficiency and improved LED performance. These features include:

• 4 Constant Current Output Channels with High Side Current Source
• Integrated Lock Protection for Enhanced Input Overvoltage Protection
• LED Voltage Limit to Protect LEDs from Damage due to Voltage Peaks
• Configurable PWM/Analog Control of LED Brightness
• Multiple Input Power Supplies: VBAT, VIN or Any Combination of Both
• Precision Current Adjustable from 50 mA to 800 mA per Channel

Application Field

The LM2704MFX-ADJ is mostly used in consumer and automotive applications, such as instrument cluster backlighting, vehicle interior/exterior lighting, displays and light bars. It is well-suited for applications requiring multiple-channel control, and its compact size (TSOT-23-6) makes it a great choice for space-constrained designs.

Working Principle

At the heart of the LM2704MFX-ADJ is a 4-channel, high-side current source with adjustable current sense limit. When the channel current reaches the set limit, the LED voltage is limited to protect the LEDs from damage. The LM2704MFX-ADJ also employs a low-side current sense for current monitoring and regulation.

Analog control of LED brightness is achieved through the use of analog input pins, while PWM control is provided by an external clock. The LM2704MFX-ADJ also features programmable soft start / hard start, lock-enabled protection, and thermal and voltage protection. All these features make the LM2704MFX-ADJ a highly versatile and cost-effective solution.

In summary, the LM2704MFX-ADJ is an ideal companion for powering and protecting LEDs in a variety of consumer and automotive applications. It includes a wide range of features that ensure the safety of the LEDs and superior brightness regulation. With its compact size, multiple input power supplies and easy-to-program functions, the LM2704MFX-ADJ provides an easy-to-use design solution for space-constrained applications.

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