ADP8870ACBZ-R7 Integrated Circuits (ICs)

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ADP8870ACBZ-R7 LED drivers provide a comprehensive LED backlight control solution for LCDs in portable electronic devices. With an integrated load switch and current sink drivers, this device gives designers an optimized solution for automating backlight control and multiple color temperature (CT) adjustment. This white LED driver offers programmable drive current, output voltage, turn-on/turn-off timing, and performance guarantees to meet the demands of most portable device displays. This combines a PWM brightness control mode with three illumination levels.

The ADP8870ACBZ-R7 is a high-performance integrated power management IC (PMIC) for driving multiple strings of multiple white LEDs in series. Each of its eight channels has its own driver, allowing for full flexibility in configuring a display. An integrated voltage regulator provides a well-defined output voltage, while the PWM control feature enables smooth levels of brightness control. This eliminates the need for external boost converters, reducing component count and board space.

The ADP8870ACBZ-R7 reduces design complexity with shared control and feedback pins, making it easier to configure an adjustable current system for the backlight. It can control up to sixteen parallel LCD strings and provides current accuracy and flexibility for CT adjustment. This device also features hysteretic current control, which helps ensure stable current operation. The ADP8870ACBZ-R7 is designed for low-power operation and low-power shutdown, so that it draws an extremely small amount of power when not actively driving LEDs.

The ADP8870ACBZ-R7 achieves good current accuracy for each LED channel by using a voltage-mode control architecture. An output voltage is programmed through the control pin, which is then compared to the sense voltage. When the two voltages match, the current regulation point is reached. This architecture helps users meet tight current regulation specs across the temperature range.

The ADP8870ACBZ-R7 operation is based on a thermally-enhanced LED current sense resistor and voltage-driven LED operation. The LED current is regulated by an integrated amplifier that amplifies the voltage drop across the sense resistor. The amplifier is then used to compare the output voltage to a reference voltage and adjust the LED current accordingly, thus controlling the brightness of each LED. This helps provide a uniform brightness from each LED channel, even under varying temperature and power supply conditions.

The ADP8870ACBZ-R7 is a programmable PMIC for LED drivers designed for applications such as LCD backlighting, LCD panel edge lighting, and general illumination. It offers a number of features that make it an attractive option for designers and end-users. With adjustable current regulation and current accuracy, users can achieve the desired illumination level from each LED. Additionally, hysteretic current control helps ensure stable current operation and safety. Furthermore, the ADP8870ACBZ-R7\'s integrated voltage regulator and PWM control feature streamline design complexity and reduce component count and board space, allowing for cost-effective designs.

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