LM3538

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SNVS674A – JUNE 2011 – REVISED MAY 2013

LM3538 6-Channel WLED Driver with Four Integrated LDOs

Check for Samples: LM3538

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FEATURES

DESCRIPTION

The LM3538 is a highly integrated LED driver

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Lighting:

capable of driving 6 LEDs in parallel for single display

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6-channel Backlight Capability

backlighting applications. Independent LED control

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Internal ALS Engine; PWM Input to Support

allows for a subset of the main display LEDs to be

CABC

selected for partial illumination applications.

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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

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Up to 90% Efficiency

backlight intensity control in the event of changing

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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

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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

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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

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4 Programmable LDOs (300mA/150mA Output

battery source, or by a fixed output voltage of an

Currents)

external buck converter (post regulation) leading to

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Default Startup Voltage States

higher conversion efficiency.

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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

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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

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Overload Protection

LED forward voltage, so that efficiency is maximized

Combined Common Features:

over the input voltage range

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Wide Input Voltage Range: 2.7V to 5.5V

LM3538 is offered in a tiny 30-bump DSBGA

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I2C-compatible Serial Interface

package.

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2 General-purpose Outputs

APPLICATIONS

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Smartphone Lighting

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MP3 players, Gaming Devices

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Digital Cameras

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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.