MAX16820:2MHz High-Brightness LED Drivers with High-Side Current Sense and 5000:1 Dimming

High-Brightness Step-Down LED Driver Controllers with High-Side Current-Sensing and Rapid Current-Pulsing Capability

The MAX16819/MAX16820, step-down constant-current high-brightness LED (HB LED) drivers provide a cost-effective solution for architectural and ambient lighting, LED bulbs such as MR16 and other LED illumination applications. The MAX16819/MAX16820 operate from a 4.5V to 28V input voltage range and feature a 5V/10mA on-board regulator. A high-side current-sense resistor adjusts the output current and a dedicated PWM input (DIM) enables a wide range of pulsed dimming. The MAX16819/MAX16820 are well suited for applications requiring a wide input voltage range. The high-side current-sensing and an integrated current-setting circuitry minimize the number of external components while delivering an LED current with ±5% accuracy. A hysteretic control algorithm ensures excellent input-supply rejection and fast response during load transients and PWM dimming. The MAX16819 features a 30% inductor current ripple and the MAX16820 features a 10% current ripple. These devices operate up to 2MHz switching frequency, thus allowing for small component size. The MAX16819/MAX16820 operate over the -40°C to +125°C automotive temperature range and are available in 3mm x 3mm x 0.8mm, 6-pin TDFN packages.

Key Features
  • Simple High-Power LED Lighting Design with Accurate LED Current Control
    • Over 25W Output Power
    • High-Side Current Sense
    • Adjustable Constant LED Current
    • ±5% LED Current Accuracy
    • 4.5V to 28V Input Voltage Range
  • Wide Dimming Range (5000:1)
    • Dedicated Dimming-Control Input
    • 20kHz Maximum Dimming Frequency
  • Minimizes Number of Components to Save Space and Cost
    • Hysteretic Control: No Compensation
    • Up to 2MHz Switching Frequency
    • 5V, 10mA On-Board Regulator
MAX16819, MAX16820: Typical Operating Circuit
MAX16819, MAX16820: Typical Operating Circuit
  • Architectural, Industrial, and Ambient Lighting
  • Heads-Up Display
  • Indicators and Emergency Lighting
titleDownload file
MAX16819-MAX16820 Data SheetMAX16819-MAX16820.pdf
Part NumberRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
PWM Dimming Freq.
Dimming RatioDimming ControlVDROPOUT
LED String Volt.
Oper. Freq.
maxmaxmaxtypminmaxmaxmaxSee Notes
MAX16819Inductor Based61Series3205000PWM500170254.5281.5262000TDFN-EP/6$0.90 @1k
Design kits & evaluation modules
Quality and Environmental Data
Ordering Information
Part NumberStatusRecommended ReplacementPackageTempRoHS
MAX16820ATT+ActiveTDFN-EP,;6 pin;9.6 mm²-40°C to +125°CLead Free
MAX16820ATT+TActiveTDFN-EP,;6 pin;9.6 mm²-40°C to +125°CLead Free
MAX16819-MAX16820.pdf MAX16820
MAX16819-MAX16820_cn.pdf MAX16820
DC Voltage Controls PWM Dimming of High-Brightness LEDs (HB LEDs) MAX16820
Diagnose LEDs by Monitoring the Switch-Mode Duty Cycle MAX9141
MAX16820.pdf MAX16820
MAX16819-MAX16820_cn.pdf MAX16820