6 channel high-efficiency/Efficacy LED backlight driver
Product details
Parameters
Package | Pins | Size
Features
- High-efficiency DC/DC boost converter with integrated 0.19-Ω power MOSFET and three switching frequency options: 312 kHz, 625 kHz, and 1250 kHz
- 2.7-V to 36-V Boost switch input voltage range supports multi-cell Li-Ion batteries
(2.7-V to 20-V VDD input range) - 7-V to 43-V Boost switch output voltage range supports as few as 3 WLEDs in series per channel and as many as 12
- Configurable channel count (1 to 6)
- Up to 50 mA per channel
- PWM and / or I2C brightness control
- Phase-shift PWM mode reduces audible noise
- Adaptive dimming for higher LED drive optical efficiency
- Programmable edge-rate control and spread spectrum scheme minimize switching noise and improve EMI performance
- LED fault (short and open) detection, UVLO, TSD, OCP, and OVP (up to 6 threshold options)
- Available in tiny 20-pin, 0.4-mm pitch DSBGA package and 24-pin, 0.5-mm pitch WQFN package
All trademarks are the property of their respective owners.
Description
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.
Technical documentation
Design & development
For additional terms or required resources, click any title below to view the detail page where available.Hardware development
Description
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 (...)
Features
- 2.7V-36V boost input range (2.7V-20V VDD range)
- 43V maximum boost output voltage
- LP8556SQE-E09 High-Efficiency WLED Driver
- USB2ANY Interface Board for easy device control
- Configurable array of 72 side emitting white LEDs
- Evaluation Software
- Compact, low-profile, external components
Description
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 (...)
Features
- 2.7V-36V boost input range (2.7V-20V VDD range)
- 43V maximum boost output voltage
- LP8556TME-E05 High-Efficiency WLED Driver with Configurable EPROM Settings
- USB-I2C Interface Board for easy device control
- Configurable array of 72 side emitting white LEDs
- Evaluation Software
- Compact, low-profile, external (...)
Software development
Linux Mainline Status
Available in Linux Main line: Yes
Available through git.ti.com: N/A
Supported Devices:
- lp8550
- lp8551
- lp8552
- (...)
Design tools & simulation
Features
- Leverages Cadence PSpice Technology
- Preinstalled library with a suite of digital models to enable worst-case timing analysis
- Dynamic updates ensure you have access to most current device models
- Optimized for simulation speed without loss of accuracy
- Supports simultaneous analysis of multiple products
- (...)
Reference designs
Design files
-
download TIDA-01635 Gerber.zip (1866KB) -
download TIDA-01635 BOM.pdf (55KB) -
download TIDA-01635 Assembly Drawing.pdf (137KB) -
download TIDA-01635 PCB.pdf (832KB)
CAD/CAE symbols
Package | Pins | Download |
---|---|---|
DSBGA (YFQ) | 20 | View options |
WQFN (RTW) | 24 | View options |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
Recommended products may have parameters, evaluation modules or reference designs related to this TI product.
Support & training
TI E2E™ forums with technical support from TI engineers
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