MAX16806:EEPROM-Programmable, High-Voltage, 350mA LED Drivers with LED Current Foldback

High-Current Linear LED Drivers Eliminate the Need for µC or Switch-Mode Converter

The MAX16805/MAX16806 LED drivers eliminate the need for microcontrollers or switch-mode converters. An EEPROM-programmable LED current-sense reference simplifies production by using one sense resistor to set the LED current for all LED bins. A dual-mode DIM pin and an on-board 200Hz ramp generator allow for PWM dimming with an analog or PWM control signal. The analog control signal at dimming input DIM allows for the "theater dimming" effect to be implemented. Fast turn-on/-off times ensure a wide-range PWM operation, while waveshaping circuitry minimizes EMI. EEPROM-programmable LED current foldback makes it possible to operate at a high input voltage, while saving the cost and space associated with having a large heatsink. The MAX16806 works with an external thermal sensor to maintain maximum LED junction temperature by folding back the LED current. The thermal foldback temperature knee and slope are EEPROM programmable. The MAX16806 SW pin supplies necessary wetting current to a momentary switch.

Key Features
  • EEPROM or I²C Dynamically Programmable:
    • LED Current Foldback for High Input Voltage
    • LED Current Reference
    • LED Current Thermal Foldback (MAX16806)
  • On-Board 200Hz Ramp Generator Eliminates the Need for µC PWM Signal
  • Flexible Analog or PWM Control for PWM or Theater Dimming
  • Wetting Current and Debounce for Momentary Switch (MAX16806)
  • 5.5V to 40V Input with Up to 39V Output Capability
  • 35mA to 350mA Adjustable LED Current
  • Waveshaping Minimizes EMI During Dimming
  • Output Short-Circuit and Overtemperature Protection
  • -40°C to +125°C Operating Temperature Range
MAX16805, MAX16806: Typical Operating Circuit
MAX16805, MAX16806: Typical Operating Circuit
Applications/Uses
  • Emergency Vehicle Warning Lights
  • Navigation and Marine Indicators
DataSheet
titleDownload file
MAX16805-MAX16806 Data SheetMAX16805-MAX16806.pdf
Parametrics
Part NumberRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
(A)
PWM Dimming Freq.
(kHz)
Dimming RatioDimming ControlVDROPOUT
(mV)
VCURR_SENSE
(mV)
POUT
(W)
VIN
(V)
VIN
(V)
ICC
(mA)
LED String Volt.
(V)
Package/PinsBudgetary
Price
maxmaxmaxtypminmaxmaxmaxSee Notes
MAX16806Linear101Series0.352200Analog
I2C Serial
PWM
400198146.5404.538.6TQFN/20$1.56 @1k
Design kits & evaluation modules
Related Products
  • MAX16804:High-Voltage, 350mA, High-Brightness LED Driver with Analog and PWM Dimming Control
  • MAX16803:High-Voltage, 350mA, High-Brightness LED Driver with PWM Dimming and 5V Regulator
  • MAX16800:High-Voltage, 350mA, Adjustable Linear High-Brightness LED (HB LED) Driver
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX16806ATP+Last Time BuyTQFN,;20 pin;26 mm²-40°C to +125°CLead Free
MAX16806ATP+TActiveQFN;-40°C to +125°CSee data sheet
MAX16806EVMAXQUSB+No Longer AvailableEVKIT;-40°C to +125°CSee data sheet
MAX16805-MAX16806.pdf MAX16806
MAX16805-MAX16806.pdf MAX16805