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

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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.

MAX16819, MAX16820: Typical Operating Circuit MAX16819, MAX16820: Typical Operating Circuit Enlarge+

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


  • Architectural, Industrial, and Ambient Lighting
  • Heads-Up Display
  • Indicators and Emergency Lighting
Part NumberRegulation TopologyMax. No. of LEDsLED ChannelsLED ConfigurationILED per Channel
PWM Dimming Freq.
Dimming RatioDimming ControlVDROPOUT
LED String Volt.
Oper. Freq.
maxmaxmaxtypminmaxmaxmaxSee Notes
MAX16819 Inductor Based61Series3205000PWM500170254.5281.5262000
$0.95 @1k
MAX16820 190
See All LED Drivers (79)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX16820EVKIT: MAX16820 Evaluation Kit
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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