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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

Product Details

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

Applications/Uses

  • Architectural, Industrial, and Ambient Lighting
  • Heads-Up Display
  • Indicators and Emergency Lighting
Parametric specs for LED Drivers
VIN (V) (min) 4.5
VIN (V) (max) 28
Max. No. of LEDs 6
# LED Channels 1
Regulation Topology Inductor Based
LED Configuration Series
ILED per Channel (A) (max) 3
PWM Dimming Freq. (kHz) (max) 20
Dimming Ratio (max) 5000
Dimming Control PWM
VDROPOUT (mV) (typ) 500
VCURR_SENSE (mV) 190
POUT (W) 25
ICC (mA) (max) 1.5
LED String Volt. (V) (max) 26
Switching Frequency (kHz) 2000
Package/Pins TDFN/6
Budgetary
Price (See Notes)
$0.95 @1k
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Simplified Block Diagram

MAX16819, MAX16820: Typical Operating Circuit MAX16819, MAX16820: Typical Operating Circuit Zoom icon

Design & Development

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Description

The MAX16820 evaluation kit (EV kit) demonstrates a step-down, constant-current, hysteretic controlled switching regulator for driving high-brightness LEDs (HB LEDs) using the MAX16820 controller IC. This EV kit is configured to supply an average output LED current of 1A, and operates from a 5V to 28V supply.

The EV kit eases evaluation of the MAX16820 dedicated pulse-width-modulation (PWM) dimming control and undervoltage lockout (UVLO) features.

The MAX16820 EV kit comes with the MAX16820 installed. The MAX16820 EV kit can also be used to evaluate the MAX16819. Contact the factory for free samples of the pin-compatible MAX16819 to evaluate this part.

View Details

Features

  • Operates from a 5V to 28V, 1.5A Supply
  • Constant LED Current Control
  • 1A Average LED Current
  • PWM Dimming Control Up to 20kHz
  • Fully Assembled and Tested

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Support & Training

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Parameters

Parametric specs for LED Drivers
VIN (V) (min) 4.5
VIN (V) (max) 28
Max. No. of LEDs 6
# LED Channels 1
Regulation Topology Inductor Based
LED Configuration Series
ILED per Channel (A) (max) 3
PWM Dimming Freq. (kHz) (max) 20
Dimming Ratio (max) 5000
Dimming Control PWM
VDROPOUT (mV) (typ) 500
VCURR_SENSE (mV) 190
POUT (W) 25
ICC (mA) (max) 1.5
LED String Volt. (V) (max) 26
Switching Frequency (kHz) 2000
Package/Pins TDFN/6
Budgetary
Price (See Notes)
$0.95 @1k

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

Applications/Uses

  • Architectural, Industrial, and Ambient Lighting
  • Heads-Up Display
  • Indicators and Emergency Lighting

Description

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.

Simplified Block Diagram

MAX16819, MAX16820: Typical Operating Circuit MAX16819, MAX16820: Typical Operating Circuit 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