A6269KLJTR-T Integrated Circuits (ICs)

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A6269KLJTR-T is a PMIC (Power Management Integrated Circuit) and LED driver designed by Allegro MicroSystems. In addition to providing an integrated solution for LED lighting application, it also integrates various other power conversion and control functions into a single IC. The device is ideally suited for applications such as residential lighting and appliances, decorative lighting, televisions, monitors, and automotive interior lighting.

The A6269KLJTR-T is a highly integrated converter with the capability to drive multiple low power LEDs or other lighting sources with high efficiency, good transient response, and low EMI. The total power output capability is up to 25 W depending on the system design and the load type. The operating temperature range of the IC is from -40°C to +125°C.

The A6269KLJTR-T integrates an adjustable step-up voltage converter, an adjustable step-down voltage converter, and a regulated current source. The on-chip current regulation loop ensures a constant output current regardless of LED forward voltage or capacitor ESR variations by sensing the LED supply current. The output voltage can be programmed from 5 V to 32 V. The output current is programmable in the range of 10 mA to 2.5 A.

The integrated step-down converter regulates the output voltage at 3.3 V, 5 V, or 12 V. The current limit can be programmed from 0 to 2 A with LDO type over-current protection. The output voltage of the converter can be programmed from 0.6 V to 12 V. The operating frequency of the PWM converter can be programmed up to 500 kHz.

The integrated linear voltage regulator provides up to 500 mA at a fixed output voltage up to 5 V. The fixed output voltage is programmed with an external resistor divider. The output voltage tolerance is typically ±2%. The multiple switching frequencies of the IC, between 16 kHz to 400 kHz, can reduce Electromagnetic Interference (EMI).

The IC also provides light source sequencing and dimmable LED control. The output current can be modulated using various dimming modes including pulse-width modulation (PWM), digital phase dimming, and analog dimming. The device\'s interface to the related external components is through the standard I²C communication protocol.

In summary, the A6269KLJTR-T is a PMIC and LED driver which integrates power conversion and control functions suitable for LED lighting application. It has an adjustable step-up voltage converter, an adjustable step-down voltage converter, a regulated current source, and a linear voltage regulator. The device offers a total output power of up to 25 W. The operating temperature range of the IC is from -40°C to +125°C. It also has multiple switching frequencies of 16 kHz to 400 kHz to reduce EMI. The device provides light source sequencing and dimmable LED control with various dimming modes.

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