The LP8556 device is a white-LED driver featuring an asynchronous boost converter and six high precision current sinks that can be controlled by a PWM signal or an I2C master.
The boost converter uses adaptive output voltage control for setting the optimal LED driver voltages as low as 7 V and as high as 43 V. This feature minimizes the power consumption by adjusting the output voltage to the lowest sufficient level under all conditions. The converter can operate at three switching frequencies: 312 kHz, 625 kHz, and 1250 kHz, which can be set with an external resistor or pre-configured via EPROM. Programmable slew rate control and spread spectrum scheme minimize switching noise and improve EMI performance.
LED current sinks can be set with the PWM dimming resolution of up to 15 bits. Proprietary adaptive dimming mode allows higher system power saving. In addition, phase shifted LED PWM dimming allows reduced audible noise and smaller boost output capacitors.
The LP8556 device has a full set of fault-protection features that ensure robust operation of the device and external components. The set consists of input undervoltage lockout (UVLO), thermal shutdown (TSD), overcurrent protection (OCP), up to 6 levels of overvoltage protection (OVP), LED open and short detection.
The LP8556 device operates over the ambient temperature range of –30°C to +85°C. It is available in space-saving 20-pin DSBGA and 24-pad WQFN packages.
| Top documentation | Type | Title | Format options | Date |
|---|---|---|---|---|
| * | Data sheet | LP8556 High-Efficiency LED Backlight Driver For Tablets datasheet (Rev. M) | PDF | HTML | Jun 10, 2020 |
| White paper | Common LED Functions and LED Driver Design Considerations | Sep 21, 2020 | ||
| Application note | Some Guidelines and Tips for the LED Driver Application | Aug 14, 2019 | ||
| Application note | AN-1112 DSBGA Wafer Level Chip Scale Package (Rev. AI) | Jun 14, 2019 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | Jun 25, 2018 | ||
| Application note | Inductor Selection in Boost Converters for LCD Backlight Applications | Oct 24, 2016 | ||
| Application note | Schottky Diode Selection in Asynchronous Boost Converters | Sep 6, 2016 | ||
| Application note | Power Budget for Backlight Drivers | Jun 27, 2013 | ||
| Application note | Increasing Full-Load Efficiency of a Backlight Driver | Jun 5, 2013 |
For additional terms or required resources, click any title below to view the detail page where available.
The Texas Instruments LP8556SQ-EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LP8556 High-Efficiency LED Backlight Driver. The device features high efficiency boost DC-DC converted and 6 high-precision current sinks that can be controlled by either a PWM (...)
The Texas Instruments LP8556TM-EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LP8556 High-Efficiency LED Backlight Driver. The device features high efficiency boost DC-DC converted and 6 high-precision current sinks that can be controlled by either a PWM (...)
The Linux driver supports the LP8550/1/2/3/5/6 and LP8557. The Linux driver supports communication through the I2C bus and interfaces with the backlight and PWM sub-system.
Available in Linux Main line: Yes
Available through git.ti.com: N/A
This reference design describes the power solution for LCD displays in wearable devices, especially in augmented-reality (AR) and virtual reality (VR) headsets. The high current accuracy backlight driver is achieved by LP8556, which provides high current during small duty cycle synchronized with (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| DSBGA (YFQ) | 20 | Ultra Librarian |
| WQFN (RTW) | 24 | Ultra Librarian |
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
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