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LM3538 Datasheet(PDF) 1 Page - Texas Instruments |
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LM3538 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 31 page LM3538 www.ti.com SNVS674A – JUNE 2011 – REVISED MAY 2013 LM3538 6-Channel WLED Driver with Four Integrated LDOs Check for Samples: LM3538 1 FEATURES DESCRIPTION The LM3538 is a highly integrated LED driver 2 Lighting: capable of driving 6 LEDs in parallel for single display • 6-channel Backlight Capability backlighting applications. Independent LED control • Internal ALS Engine; PWM Input to Support allows for a subset of the main display LEDs to be CABC selected for partial illumination applications. • Built-in Power Supply and Gain Control for I2C-compatible control allows full configurability of the Ambient Light Sensor backlighting function. The LM3538 provides multi- zone Ambient Light Sensing allowing autonomous • Up to 90% Efficiency backlight intensity control in the event of changing • Adaptive Charge Pump with 1x and 1.5x Gains ambient light conditions. A PWM input is also for Maximum Efficiency provided to give the user a means to adjust the • 128 Dimming Steps for Group A, Exponential backlight intensity dynamically based upon the or Linear Dimming Selectable by Register content of the display. Setup Four integrated LDOs are fully configurable through • 8 Linear Dimming States for Group B I2C capable of addressing point-of-load regulation needs for functions such as integrated camera LDOs: modules. The LDOs can be powered from main • 4 Programmable LDOs (300mA/150mA Output battery source, or by a fixed output voltage of an Currents) external buck converter (post regulation) leading to • Default Startup Voltage States higher conversion efficiency. • Low Dropout Voltage: 100mV typ. at 150mA The LM3538 provides excellent efficiency without the Load Current use of an inductor by operating the charge pump in a • LDO Input Voltage = 1.8V to VIN_A gain of 3/2 or in Pass-Mode. The proper gain for maintaining current regulation is chosen, based on • Overload Protection LED forward voltage, so that efficiency is maximized Combined Common Features: over the input voltage range • Wide Input Voltage Range: 2.7V to 5.5V LM3538 is offered in a tiny 30-bump DSBGA • I2C-compatible Serial Interface package. • 2 General-purpose Outputs APPLICATIONS • Smartphone Lighting • MP3 players, Gaming Devices • Digital Cameras 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 © 2011–2013, 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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