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LM3530

ACTIVE

High efficiency white LED driver with programmable Ambient Light Sensing Capability

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Data sheet

LM3530

ACTIVE
Data sheet Order now

Product details

Number of channels 1 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 0 Vout (max) (V) 40 Type Inductive Switching frequency (max) (kHz) 500 Duty cycle (max) (%) 94 LED current per channel (mA) 30 Peak efficiency (%) 88 Topology Boost Features I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
Number of channels 1 Vin (min) (V) 2.7 Vin (max) (V) 5.5 Vout (min) (V) 0 Vout (max) (V) 40 Type Inductive Switching frequency (max) (kHz) 500 Duty cycle (max) (%) 94 LED current per channel (mA) 30 Peak efficiency (%) 88 Topology Boost Features I2C control Operating temperature range (°C) -30 to 85 Rating Catalog
DSBGA (YFQ) 12 2.52000000000000018 mm² 1.8 x 1.4000000000000001 DSBGA (YFZ) 12 2.52000000000000018 mm² 1.8 x 1.4000000000000001
  • Drives up to 11 LEDs in series
  • 1000:1 Dimming Ratio
  • 90% Efficient
  • Programmable Dual Ambient Light Sensor Inputs
    with Internal ALS Voltage Setting Resistors
  • I2C Programmable Logarithmic or
    Linear Brightness Control
  • External PWM Input for Simple Brightness
    Adjustment
  • True Shutdown Isolation for LEDs and Ambient
    Light Sensors
  • Internal Soft-Start Limits Inrush Current
  • Wide 2.7-V to 5.5-V Input Voltage Range
  • 40-V and 25-V Overvoltage Protection Options
  • 500-kHz Fixed Frequency Operation
  • 839-mA Peak Current Limit
  • Drives up to 11 LEDs in series
  • 1000:1 Dimming Ratio
  • 90% Efficient
  • Programmable Dual Ambient Light Sensor Inputs
    with Internal ALS Voltage Setting Resistors
  • I2C Programmable Logarithmic or
    Linear Brightness Control
  • External PWM Input for Simple Brightness
    Adjustment
  • True Shutdown Isolation for LEDs and Ambient
    Light Sensors
  • Internal Soft-Start Limits Inrush Current
  • Wide 2.7-V to 5.5-V Input Voltage Range
  • 40-V and 25-V Overvoltage Protection Options
  • 500-kHz Fixed Frequency Operation
  • 839-mA Peak Current Limit

The LM3530 current mode boost converter supplies the power and controls the current in up to 11 series white LEDs. The 839-mA current limit and 2.7-V to 5.5-V input voltage range make the device a versatile backlight power source ideal for operation in portable applications.

The LED current is adjustable from 0 mA to 29.5 mA via an I2C-compatible interface. The 127 different current steps and 8 different maximum LED current levels give over 1000 programmable LED current levels. Additionally, PWM brightness control is possible through an external logic level input.

The device also features two Ambient Light Sensor inputs. These are designed to monitor analog output ambient light sensors and provide programmable adjustment of the LED current with changes in ambient light. Each ambient light sensor input has independently programmable internal voltage setting resistors which can be made high impedance to reduce power during shutdown. The 500-kHz switching frequency allows for high converter efficiency over a wide output voltage range accommodating from 2 to 11 series LEDs. Finally, the support of Content Adjusted Backlighting maximizes battery life while maintaining display image quality.

The LM3530 operates over the −40°C to 85°C temperature range.

The LM3530 current mode boost converter supplies the power and controls the current in up to 11 series white LEDs. The 839-mA current limit and 2.7-V to 5.5-V input voltage range make the device a versatile backlight power source ideal for operation in portable applications.

The LED current is adjustable from 0 mA to 29.5 mA via an I2C-compatible interface. The 127 different current steps and 8 different maximum LED current levels give over 1000 programmable LED current levels. Additionally, PWM brightness control is possible through an external logic level input.

The device also features two Ambient Light Sensor inputs. These are designed to monitor analog output ambient light sensors and provide programmable adjustment of the LED current with changes in ambient light. Each ambient light sensor input has independently programmable internal voltage setting resistors which can be made high impedance to reduce power during shutdown. The 500-kHz switching frequency allows for high converter efficiency over a wide output voltage range accommodating from 2 to 11 series LEDs. Finally, the support of Content Adjusted Backlighting maximizes battery life while maintaining display image quality.

The LM3530 operates over the −40°C to 85°C temperature range.
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Technical documentation

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Type Title Date
* Data sheet LM3530 High-Efficiency White-LED Driver with Programmable Ambient Light Sensing Capability and I2C-Compatible Interface datasheet (Rev. L) PDF | HTML 23 Dec 2014
White paper Common LED Functions and LED Driver Design Considerations 21 Sep 2020
Selection guide Power Management Guide 2018 (Rev. R) 25 Jun 2018
Application note Analog PWM Dimming in White-LED Drivers 21 Dec 2016
Application note Inductor Selection in Boost Converters for LCD Backlight Applications 24 Oct 2016
Application note Schottky Diode Selection in Asynchronous Boost Converters 06 Sep 2016
User guide AN-1991 LM3530 Evaluation Kit (Rev. A) 30 Apr 2013

Design & development

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Driver or library

LM3530SW-LINUX — Linux Driver for LM3530

The Linux driver supports the LM3530 White LED Driver. The Linux driver supports communication through the I2C bus and interfaces with the LED sub-system.

 

Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

Supported Devices:

  • lm3530

 

Linux Source Files

The files (...)

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GUI for evaluation module (EVM)

SNVC045 — LM3530 Graphical User Interface

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Backlight LED drivers
LM3530 — High efficiency white LED driver with programmable Ambient Light Sensing Capability
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DSBGA (YFQ) 12 Ultra Librarian
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