ST Life.augmented


Driver for up to 40 white LEDs for mid-sized LCD display backlight based on the STLD41
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The STEVAL-TLL011V1 demonstration board demonstrates the performance of the STLD41, a boost converter that operates from 3.0 V to 21 V and which can provide an output voltage as high as 38 V.

It can drive up to 40 white LEDs connected in 4 strings of 10 LEDs in series. The total output current capability is 120 mA at an output voltage of 38 V.

Regulation is performed by the internal error amplifier which works with the feedback voltage from the sensing resistor.

The device can be turned ON/OFF by way of the logic signal connected to the EN pin.

The LEDs can be dimmed by applying a PWM signal to the PWM input.

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Errata Sheet
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Data Brief

Key Features

  • Boost DC-DC converter
  • Drives up to 40 LEDs (4 strings of 10) with a total current up to 120 mA
  • Input voltage range: 3.0 V to 21 V
  • Output current control
  • 1.8 MHz fixed frequency PWM control
  • PWM input for output current dimming with a frequency range of 25 kHz - 50 kHz
  • 2 A integrated switch
  • Overvoltage protection
  • Chip overtemperature detection and protection
  • Less than 1 μA standby current
  • Soft-start function
  • RoHS compliant


Design Resources


Technical Documentation

Product Specifications

Description Version Size
DB1654: Driver for up to 40 white LEDs for mid-sized LCD display backlight based on the STLD41
2.0 215 KB

Hardware Resources

Board Manufacturing Specification

Description Version Size
STEVAL-TLL011V1 gerber files
1.0 65 KB

Bill of Materials

Description Version Size
1.0 9 KB

Schematic Pack

Description Version Size
STEVAL-TLL011V1 schematics
2.0 64 KB

License Agreement

Description Version Size
Evaluation products license agreement
1.0 126 KB

Sample & Buy

Part Number Marketing StatusCore ProductOrder From STUnit Price (US$)*
@ 1
Distributor AvailabilityRoHS Compliance GradeDownload
Material Declaration**
STEVAL-TLL011V1ActiveSTLD41Buy Direct89.42Distributor reported inventory date: 2016-02-29
Distributor NameRegionStockMin. order
Newark Element14Order NowAMERICA10

(*) Suggested Resale Price per unit (USD) for BUDGETARY USE ONLY. For quotes, prices in local currency, please contact your local ST Sales Office or our Distributors
(**) The Material Declaration forms available on may be generic documents based on the most commonly used package within a package family. For this reason, they may not be 100% accurate for a specific device. Please contact our sales support for information on specific devices.