General Description

The MAX16819/MAX16820, step-down constant-current high-brightness LED (HB LED) drivers provide a cost effective solution for automotive interior/exterior lighting, 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 fre quency, thus allowing for small component size.

Features

♦ High-Side Current Sense

♦ Dedicated Dimming Control Input

♦ 20kHz Maximum Dimming Efficiency

♦ Hysteretic Control: No Compensation

♦ Up to 2MHz Switching Frequency

♦ ±5% LED Current Accuracy

♦ Adjustable Constant LED Current

♦ 4.5V to 28V Input Voltage Range

♦ Over 25W Output Power

♦ 5V, 10mA On-Board Regulator

♦ -40°C to +125°C Operating Temperature Range

Applications

  Architectural, Industrial, and Ambient Lighting

  Automotive RCL, DRL, and Fog Lights

  MR16 and Other LED Bulbs

  Indicators and Emergency Lighting