The LP8553 is a white LED driver with integrated boost converter. It has four adjustable current sinks which can be controlled by PWM input or with I2C-compatible serial interface.
The boost converter has adaptive output-voltage control based on the LED driver voltages. This feature minimizes the power consumption by adjusting the voltage to lowest sufficient level in all conditions.
LED outputs have 8-bit current resolution and up to 13-bit PWM resolution with additional 1-3 bit dithering to achieve smooth and precise brightness control. Proprietary Phase Shift PWM control is used for LED outputs to reduce peak current from the boost converter, thus making the boost capacitors smaller. The Phase Shifting scheme also eliminates audible noise.
Automatic PWM dimming at lower brightness values and current dimming at higher brightness values can be used to improve the optical efficiency.
Internal EEPROM is used for storing the configuration data. This makes it possible to have minimum external component count and make the solution very small.
LP8553 has safety features which make it possible to detect LED outputs with open or short fault. Low input voltage and boost over-current conditions are also monitored, and the chip is turned off when these events occur. Thermal de-rating function prevents overheating of the device by reducing backlight brightness when set temperature has been reached.
LP8553 is available in TI’s DSBGA 25-bump package.
| Tipo | Título | Fecha | ||
|---|---|---|---|---|
| * | Data sheet | LP8553 High-Efficiency LED Backlight Driver for Notebooks datasheet (Rev. B) | 03 ene 2014 | |
| White paper | Common LED Functions and LED Driver Design Considerations | 21 sep 2020 | ||
| Application note | Some Guidelines and Tips for the LED Driver Application | 14 ago 2019 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 jun 2018 |
Para conocer los términos adicionales o los recursos necesarios, haga clic en cualquier título de abajo para ver la página de detalles cuando esté disponible.
Available in Linux Main line: Yes
Available through git.ti.com: N/A
| Encapsulado | Pines | Símbolos CAD, huellas y modelos 3D |
|---|---|---|
| DSBGA (YZR) | 25 | Ultra Librarian |
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