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Product details

Parameters

Channels (#) 3 Vin (Min) (V) 2.5 Vin (Max) (V) 5.5 Switching frequency (Max) (kHz) 1050 Product type Inductive LED current per channel (mA) 30 Shutdown current (Typ) (uA) 1.2 Topology Boost, Current Sink, Multi-Channel Peak efficiency (%) 92 Features Adjustable Switch Frequency, CABC, Direct PWM Dimming, Enable/Shutdown, I2C Control, OVP, Thermal Shutdown Operating temperature range (C) -40 to 85 open-in-new Find other Backlight LED drivers

Package | Pins | Size

DSBGA (YFF) 12 2 mm² 1.365 x 1.765 open-in-new Find other Backlight LED drivers

Features

  • 1% Matched Current Sinks Across Process, Voltage, Temperature
  • 3% Current-Sink Accuracy Across Process, Voltage, Temperature
  • 11-Bit Dimming Resolution
  • Up to 90% Solution Efficiency
  • Drives from One to Three Parallel LED Strings at up to 38 V at 25 mA per String
  • 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, 24 V, 31 V, 38 V)
  • Four Configurable Overcurrent Protection Thresholds (750 mA, 1000 mA, 1250 mA,
    1500 mA)
  • Thermal Shutdown Protection
  • Externally Selectable I2C Address Options via ASEL Input
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Description

The LM36923H is an ultra-compact, highly efficient, three-string white-LED driver designed for LCD display backlighting. The device can power up to 12 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 with noise-free operation from 50 µA to 25 mA.

Other features include an auto-frequency mode, which can automatically change the frequency based on load current in order to optimize efficiency.

The device operates over the 2.5-V to 5.5-V input voltage range and a –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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Type Title Date
* Datasheet LM36923H Highly Efficient Triple-String White LED Driver datasheet (Rev. B) Oct. 07, 2016
Application notes Analog PWM Dimming in White-LED Drivers Dec. 21, 2016
Application notes Auto-Frequency Mode Setting for Improved Boost Efficiency in White LED Backlight Oct. 14, 2016
Technical articles Here's how body electronics and lighting technology are changing the driving experience Sep. 26, 2016
Technical articles LED brightness adjustment: high-frequency PWM dimming Aug. 26, 2016
User guides Using the LM36923HEVM Evaluation Module Jan. 18, 2016
Technical articles Take better selfies with innovative LED flashes Nov. 18, 2014
Technical articles Solving the automotive EMI issues in new cars with all the screens Sep. 10, 2014

Design & development

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

Hardware development

EVALUATION BOARDS Download
document-generic User guide
$99.00
Description

The LM36922 Evaluation Module (LM36922EVM) is designed to fully evaluate the LM36922 Highly Efficient Dual-String White LED backlight driver.  The LM36922EVM consists of the LM36922 with 2p8s white LED strings with jumpers to enable 1p2s through 2p8s led string configurations.  LED string (...)

Features
  • Supports 1p2s thru 2p8s LED strings (jumper configurable)
  • Evaluation kits comes with USB2ANY interface and GUI for out of the box evaluation
EVALUATION BOARDS Download
document-generic User guide
$99.00
Description
The LM36923H evaluation module (LM36923HEVM) is designed to fully evaluate the LM36923H highly efficient triple-string white LED backlight driver. The LM36923HEVM consists of the LM36923H with three strings of 13 white LEDs. Configuration jumpers proivide a wide range of LED string (...)
Features
  • Individual string configuration allows easy evaluation of string mismatch
  • LED string current measurement across 10Ω resistor in each string
  • LED string disconnect jumper allows quick verification of OVP voltages or total LED string current measurement
  • External PWM input provided by USB2ANY interface (...)
GUIS FOR EVALUATION MODULES (EVM) Download
SNVC193.ZIP (2609 KB)

CAD/CAE symbols

Package Pins Download
DSBGA (YFF) 12 View options

Ordering & quality

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