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The MAX16819/MAX16820 are step-down constant current high-brightness LED (HB LED) drivers that provide a cost-effective solution for automotive interior/exterior lighting, architectural and ambient lighting, LED bulbs such as MR16 and other LED lighting applications.
The MAX16819/MAX16820 operate from a 4.5V to 28V input voltage range and have a 5V/10mA on-chip voltage regulator. The output current is regulated by a high-side current sense resistor, and a dedicated PWM input (DIM) enables a wide range of pulsed brightness adjustments.
The MAX16819/MAX16820 are ideal for applications that require a wide input voltage range. High-side current sensing and built-in current setting circuitry minimizes the number of external components and provides ±5% accuracy of LED current. The hysteresis control algorithm guarantees excellent input supply rejection and fast response during load switching and PWM dimming. The MAX16819 has an inductor ripple current of 30%, while the MAX16820 has a ripple current of 10%. These devices operate at switching frequencies up to 2MHz, allowing the use of small components.
The MAX16819/MAX16820 operate over the -40°C to +125°C automotive temperature range and are available in a 3mm x 3mm x 0.8mm, 6-pin TDFN package.
Key characteristics
High-side current detection
Dedicated brightness adjustment control input
20kHz maximum brightness adjustment frequency
Hysteresis control: no compensation required
Switching frequency up to 2MHz
LED current accuracy: ± 5%
Adjustable constant LED current
Input voltage range is 4.5V to 28V
Output power exceeds 25W
5V, 10mA on-chip voltage regulator
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