The MAX16819 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 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 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 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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