LM3648YFFR Integrated Circuits (ICs)

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The LM3648YFFR LED Drivers is a power management IC (PMIC) used to control LED strings. It is designed to drive conventional small-signal LEDs, such as those used in automotive, commercial and residential applications.

The LM3648YFFR device is an eFuse-protected DC/DC converter in an automotive-qualified, Space-efficient 4mm × 4mm QFN package. It includes an internal soft-start, internal temperature sensing and thermal regulation feature to coordinate the temperature of the device with the operating environment.

The LM3648YFFR device combines high efficiency and low noise performance with true wide-input voltage range, supporting both ac and dc inputs. It is designed for use with a wide range of input voltages, including 3.3V, 12V, 24V, 36V and 48V, and outputs up to 100mA with an accuracy of ±1.5% and over the -20°C to +125°C temperature range.

The LM3648YFFR is capable of efficient current regulation, set using a single resistor. It utilizes a unique Dynamic Regulators ArchitectureTM that, in cooperation with eFuses, provides optimal current regulation without the need for a feedback circuit. The LM3648YFFR also includes over-voltage protection, user-programmable input and output current limits, over-temperature protection and under-voltage lockout.

The LM3648YFFR can be configured to provide constant current, constant voltage or constant power output at the desired level. The device also automatically adjusts the output voltage scale to the number of LEDs connected, so no over-driven LED operation is possible. The Constant Mode operation enables long LED lifetimes and puts forth an impressive combination of current, voltage and power regulation.

The LM3648YFFR device offers programmable PWM dimming and quad-level dimming control, allowing adjustability of the current level to achieve desirable brightness. The device operates at PWM frequencies of up to 1MHz to minimize the switching ripple and EMI. The device also features glitch-less, smooth dimming transition, adjustable slew rate and ac line filtering, as well as a low operating current profile.

To protect against short circuits, the LM3648YFFR device enables pre-programmed trip thresholds and auto-restart time periods. The device conveniently supplies the LEDs with the required current to the desired level, provided the stored signal from the eFuse senses the actual load applied to the LED string. In addition, the device\'s Self Restore protection ensures safe operation of the LED strings in the event of a short circuit event.

In summary, the LM3648YFFR is an automotive-qualified PMIC optimized for LED driving applications providing strong protections and features that enable efficient and reliable LED driving, current regulation, and dimming control performance. It provides efficient power conversion, eFuse-based current regulation, over-voltage protection and user-programmable, extremely low operational current.

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