LV5011MD-AH Integrated Circuits (ICs)

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LV5011MD-AH is an integrated circuit (IC) packaged in an 8-pin plastic dual in-line package (PDIP), designed by Sanken Electric Co., Ltd. It is classified as a PMIC—LED driver, used for backlighting LCDs in cellular phones, digital cameras, and other small devices.

The LV5011MD-AH provides illumination of about 4.5 to 6.5 milliamperes (mA) for up to 16 LEDs, with a recommended maximum for each LED being 50 mA. This IC has a wide range of input voltage from 2.7 to 5.5 volts, capable of operating with a single Li-ion battery. It is designed to work in conditions ranging from -40 to 85 degrees Celsius, and with a high efficiency of approximately 89%.

LED drivers are used to provide constant current to an LED, independent of the supply voltage. The output voltage of this IC is a voltage drop determined by the on resistance of the power transistors, not the LED current. It is a necessary function of LED drivers to be able to control the current to the LED and maintain a constant brightness.

The working principle of the LV5011MD-AH is based on the constant current boost/charge pump architecture. Upon start-up, the oscillator starts with an internal reset and the LED is disabled until the oscillator reaches its frequency. When oscillatory operation is achieved, the LED will turn on. The controller then uses a control loop that feeds back an analog voltage from the LED pin to its own internal comparator. The comparator will compare this voltage to another voltage reference and adjust the gate voltage that controls the MOSFETs driving the LED so that the current will remain constant during the entire operation.

The LV5011MD-AH is designed for small-to-medium illumination applications. It offers high efficiency, low power consumption and a wide operating range, making it a suitable choice for powering LCDs used in mobile devices and digital cameras. The IC is also easy to integrate into various applications due to its internal comparator and current control loop.

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