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Programmable, Four-String HB LED Driver with Output-Voltage Optimization and Fault Detection

Programmable, Four-String LED Driver with Integrated ADC Optimizes Output Voltage and Detects LED Fault Conditions

Product Details

Key Features

Applications/Uses

Parametric specs for LED Drivers
VIN (V) (min) 4.75
VIN (V) (max) 24
Max. No. of LEDs 100
# LED Channels 4
Regulation Topology Inductor Based
LED Configuration Series-Parallel
ILED per Channel (A) (max) 1
PWM Dimming Freq. (kHz) (max) 100
Dimming Ratio (max) 5000
Dimming Control I2C Serial
PWM
VCURR_SENSE (mV) 99
POUT (W) 100
ICC (mA) (max) 10
LED String Volt. (V) (max) 100
Switching Frequency (kHz) 1000
Package/Pins TQFN/32
Budgetary
Price (See Notes)
3.35
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Simplified Block Diagram

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Parameters

Parametric specs for LED Drivers
VIN (V) (min) 4.75
VIN (V) (max) 24
Max. No. of LEDs 100
# LED Channels 4
Regulation Topology Inductor Based
LED Configuration Series-Parallel
ILED per Channel (A) (max) 1
PWM Dimming Freq. (kHz) (max) 100
Dimming Ratio (max) 5000
Dimming Control I2C Serial
PWM
VCURR_SENSE (mV) 99
POUT (W) 100
ICC (mA) (max) 10
LED String Volt. (V) (max) 100
Switching Frequency (kHz) 1000
Package/Pins TQFN/32
Budgetary
Price (See Notes)
3.35

Key Features

  • 4 Channels of Programmable, Fault-Protected, Constant-Current Source-Driver Controllers for All White, RGB, or RGB Plus Amber LED Configurations
    • Drives One to Four LED Strings
    • Individual PWM Dimming Inputs per String
    • Very Wide Dimming Range
  • Configurable as a boost or SEPIC Converter with Programmable 100kHz to 1MHz Switching Frequency for Design Flexibility
    • Integrated Boost/SEPIC Controller
    • External MOSFETs Allow Wide-Range LED Current with Multiple LEDs per String
    • 200kHz to 2MHz Programmable Switching Frequency for Optimizing Size vs. Efficiency
    • External Switching-Frequency Synchronization
  • I2C Allows the Current-Sink Drain Voltages to be Read to Minimize Power Dissipation and Detect LED String Fault Conditions
    • 7-Bit Internal ADC for LED Voltage Monitoring and Optimization
    • Dynamic Adjustment of LED String Currents and Output Voltage
    • Standby Mode
  • Protection Features Improve Reliability
    • LED Short and Open Detection
    • Overvoltage and Overtemperature Protection

Applications/Uses

  • LCD Backlighting:
  • Automotive Infotainment Displays
  • Automotive Cluster Displays
  • Industrial and Desktop Monitors
  • LCD TVs
  • Automotive Lighting:
  • Adaptive Front Lighting
  • Low- and High-Beam Assemblies

Description

The MAX16826 high-brightness LED (HB LED) driver is designed for backlighting automotive LCD displays and other display applications such as industrial or desktop monitors and LCD televisions. The MAX16826 integrates a switching regulator controller, a 4-channel linear current sink driver, an analog-to-digital converter (ADC), and an I2C interface. The IC is designed to withstand automotive load dump transients up to 40V and can operate under cold crank conditions.

The MAX16826 contains a current-mode PWM switching regulator controller that regulates the output voltage to the LED array. The switching regulator section is configurable as a boost or SEPIC converter and its switching frequency is programmable from 100kHz to 1MHz.

The MAX16826 includes 4 channels of programmable, fault-protected, constant-current sink driver controllers that are able to drive all white, RGB, or RGB plus amber LED configurations. LED dimming control for each channel is implemented by direct PWM signals for each of the four linear current sinks. An internal ADC measures the drain voltage of the external driver transistors and the output of the switching regulator. These measurements are then made available through the I2C interface to an external microcontroller (µC) to enable output voltage optimization and fault monitoring of the LEDs.

The amplitude of the LED current in each linear current-sink channel and the switch-mode regulator output voltage is programmed using the I2C interface. Additional features include: cycle-by-cycle current limit, shorted LED string protection, and overtemperature protection. The MAX16826 is available in a thermally enhanced, 5mm x 5mm, 32-pin thin QFN package and is specified over the automotive -40°C to +125°C temperature range.

Simplified Block Diagram

MAX16826: Simplified Block Diagram MAX16826: Simplified Block Diagram Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .