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LM36923

ACTIVE

High efficiency, Triple-String, 30-V Synchronous white LED driver

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Data sheet

LM36923

ACTIVE
Data sheet Order now

Product details

Number of channels 3 Vin (min) (V) 2.5 Vin (max) (V) 5.5 Vout (min) (V) 0 Vout (max) (V) 29.5 Type Inductive Switching frequency (max) (kHz) 1050 Duty cycle (max) (%) 94 LED current per channel (mA) 25 Peak efficiency (%) 92 Topology Boost Features Adjustable Switch Frequency, CABC, Direct PWM Dimming, Enable/Shutdown, I2C control, OVP, PWM control, Thermal shutdown Operating temperature range (°C) -40 to 85 Rating Catalog
Number of channels 3 Vin (min) (V) 2.5 Vin (max) (V) 5.5 Vout (min) (V) 0 Vout (max) (V) 29.5 Type Inductive Switching frequency (max) (kHz) 1050 Duty cycle (max) (%) 94 LED current per channel (mA) 25 Peak efficiency (%) 92 Topology Boost Features Adjustable Switch Frequency, CABC, Direct PWM Dimming, Enable/Shutdown, I2C control, OVP, PWM control, Thermal shutdown Operating temperature range (°C) -40 to 85 Rating Catalog
DSBGA (YFF) 12 2.52000000000000018 mm² (— mm × — mm)
  • 1% Matched Current Sinks Across (Process, Voltage, Temp)
  • 3% Current Sink Accuracy Across (Process, Voltage, Temp)
  • 11-Bit Dimming Resolution
  • Up to 91.6% Solution Efficiency
  • Drives from One to Three Parallel LED Strings at up to 28 V
  • PWM Dimming Input
  • I2C Programmable
  • Selectable 500-kHz and 1-MHz Switching Frequency with Optional –12% shift
  • Auto Switch Frequency Mode (250 kHz, 500 kHz, 1 MHz)
  • Four Configurable Overvoltage Protection Thresholds (17 V, 21 V, 25 V, 29 V)
  • Four Configurable Overcurrent Protection Thresholds (750 mA, 1000 mA, 1250 mA, 1500 mA)
  • Thermal Shutdown Protection
  • 1% Matched Current Sinks Across (Process, Voltage, Temp)
  • 3% Current Sink Accuracy Across (Process, Voltage, Temp)
  • 11-Bit Dimming Resolution
  • Up to 91.6% Solution Efficiency
  • Drives from One to Three Parallel LED Strings at up to 28 V
  • PWM Dimming Input
  • I2C Programmable
  • Selectable 500-kHz and 1-MHz Switching Frequency with Optional –12% shift
  • Auto Switch Frequency Mode (250 kHz, 500 kHz, 1 MHz)
  • Four Configurable Overvoltage Protection Thresholds (17 V, 21 V, 25 V, 29 V)
  • Four Configurable Overcurrent Protection Thresholds (750 mA, 1000 mA, 1250 mA, 1500 mA)
  • Thermal Shutdown Protection

The LM36923 is an ultra-compact, highly efficient, threestring white-LED driver designed for LCD display backlighting. The device can power up to 8 series LEDs at up to 25 mA per string. An adaptive current regulation method allows for different LED voltages in each string while maintaining current regulation.

The LED current is adjusted via an I2C interface or through a logic level PWM input. The PWM duty cycle is internally sensed and mapped to an 11-bit current thus allowing for a wide range of PWM frequencies and noise-free operation.

The device operates over the 2.5-V to 5.5-V input voltage range and -40°C to 85°C temperature range.

For all available packages, see the orderable addendum at the end of the data sheet.

The LM36923 is an ultra-compact, highly efficient, threestring white-LED driver designed for LCD display backlighting. The device can power up to 8 series LEDs at up to 25 mA per string. An adaptive current regulation method allows for different LED voltages in each string while maintaining current regulation.

The LED current is adjusted via an I2C interface or through a logic level PWM input. The PWM duty cycle is internally sensed and mapped to an 11-bit current thus allowing for a wide range of PWM frequencies and noise-free operation.

The device operates over the 2.5-V to 5.5-V input voltage range and -40°C to 85°C temperature range.

For all available packages, see the orderable addendum at the end of the data sheet.

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Technical documentation

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Top documentation Type Title Format options Date
* Data sheet LM36923 Highly Efficient Triple-String White LED Driver datasheet (Rev. A) PDF | HTML Oct 7, 2016
Application note How to use the LM3697 Device to Design a Backlight Unit in a Smartphone PDF | HTML Apr 15, 2021
White paper Common LED Functions and LED Driver Design Considerations Sep 21, 2020
Application note Analog PWM Dimming in White-LED Drivers Dec 21, 2016
Application note Inductor Selection in Boost Converters for LCD Backlight Applications Oct 24, 2016
Application note Auto-Frequency Mode Setting for Improved Boost Efficiency in White LED Backlight Oct 14, 2016
Application note Schottky Diode Selection in Asynchronous Boost Converters Sep 6, 2016

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Evaluation board

LM36923EVM — LM36923EVM Highly Efficient Triple-String White LED Driver EVM

The LM36923 Evaluation Module (LM36923EVM) is designed to fully evaluate the LM36923 Highly Efficient Triple-String White LED backlight driver.  The LM36923EVM consists of the LM36923 with 3p8s white LED strings with jumpers to enable 1p2s thru 3p8s led string configurations.  LED string (...)

User guide: PDF
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GUI for evaluation module (EVM)

SNVC167 — LM36923EVM/LM36922EVM GUI Software

Supported products & hardware
Package Pins CAD symbols, footprints & 3D models
DSBGA (YFF) 12 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

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