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Product details

Parameters

Channels (#) 2 Vin (Min) (V) 2.5 Vin (Max) (V) 5.5 Switching frequency (Max) (kHz) 1050 Product type Inductive LED current per channel (mA) 25 Shutdown current (Typ) (uA) 1.2 Topology Boost Peak efficiency (%) 92 Features Adjustable Switch Frequency, CABC, Direct PWM Dimming, Enable/Shutdown, I2C Control, OVP, PWM Control, 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, Temp)
  • 3% Current Sink Accuracy Across (Process,
    Voltage, Temp)
  • 11-Bit Dimming Resolution
  • Up to 91.6% Solution Efficiency
  • Drives from One to Two 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
open-in-new Find other Backlight LED drivers

Description

The LM36922 is an ultra-compact, highly efficient, two string 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.

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Similar but not functionally equivalent to the compared device:
LM3697 ACTIVE 3 String backlight driver with 11-bits of Exponential dimming This product is a three string backlight driver with 11-bits of exponential dimming.

Technical documentation

= Top documentation for this product selected by TI
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Type Title Date
* Datasheet LM36922 Highly Efficient Dual-String White LED Driver datasheet May 13, 2015
Technical articles Overcoming challenges for backlight LED drivers in automotive display solutions Jul. 16, 2020
Application notes Analog PWM Dimming in White-LED Drivers Dec. 21, 2016
Application notes Inductor Selection in Boost Converters for LCD Backlight Applications Oct. 24, 2016
Technical articles Here's how body electronics and lighting technology are changing the driving experience Sep. 26, 2016
Application notes Schottky Diode Selection in Asynchronous Boost Converters Sep. 06, 2016
Technical articles LED brightness adjustment: high-frequency PWM dimming Aug. 26, 2016
User guides Using the LM36922EVM Evaluation Module May 13, 2015
Technical articles Take better selfies with innovative LED flashes Nov. 18, 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
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
GUIS FOR EVALUATION MODULES (EVM) Download
SNVC167.ZIP (1326 KB)

Design tools & simulation

SIMULATION TOOLS Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
DSBGA (YFF) 12 View options

Ordering & quality

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