MAX16820ATT+T step-down constant-current high-brightness LED (HB LED) drivers


Manufacturer: Maxim Integrated
Product Category: Power Management, Drivers & Controllers, LED Drivers

SKU: MAX16820ATT+T Category:


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


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