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LP8556 Datasheet(PDF) 1 Page - Texas Instruments |
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LP8556 Datasheet(HTML) 1 Page - Texas Instruments |
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1 / 52 page  LP8556 www.ti.com SNVS871B – JULY 2012 – REVISED SEPTEMBER 2012 LP8556 High-Efficiency LED Backlight Driver for Tablets Check for Samples: LP8556 1 FEATURES 2 • High Efficiency DC/DC Boost Converter with • Adaptive Dimming for Higher LED Drive Integrated 0.19 Ω Power MOSFET and Three Optical Efficiency Switching Frequency Options: 312 / 625 / 1250 • Programmable Edge-rate Control and Spread kHz Spectrum Scheme Minimize Switching Noise • 2.7V to 36V Boost Switch Input Voltage Range and Improve EMI Performance Supports Multi-cell Li-Ion Batteries (2.7V - 20V • LED Fault (short/open) Detection, UVLO, TSD, VDD Input Range) OCP and OVP (up to 6 Threshold Options) • 7V to 43V Boost Switch Output Voltage Range • Available in Tiny 20-bump, 1.715 mm x 2.376 Supports as few as 3 WLEDs in Series per mm x 0.6 mm, 0.4 mm pitch, DSBGA Package, Channel and as Many as 12 and 24-pad, 4 mm x 4 mm x 0.8 mm, 0.5 mm • Configurable Channel Count (1 to 6) Pitch, WQFN Package. • Up to 50 mA per Channel APPLICATIONS • PWM and / or I2C Brightness Control • Tablet LCD Display LED Backlight • Phase-Shift PWM Mode Reduces Audible Noise DESCRIPTION LP8556 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 7V and as high as 43V. 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, 625 and 1250 kHz settable 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 has a full set of safety features that ensure robust operation of the device and external components. The set consists of input under-voltage lockout, thermal shutdown, over-current protection, up to 6 levels of over- voltage protection, LED open and short detection. The LP8556 operates over the ambient temperature range of -30°C to +85°C. It is available in space saving 20- bump DSBGA and 24-pad WQFN packages. 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2012, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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