The MAX16822A/MAX16822B step-down constant-current high-brightness LED (HB LED) drivers provide a cost-effective design solution for automotive interior/exterior lighting, architectural and ambient lighting, LED bulbs, and other LED illumination applications.
The MAX16822A/MAX16822B operate from a +6.5V to +65V input-voltage range. A high-side current-sense resistor adjusts the output current up to 350mA and a dedicated pulse-width modulation (PWM) input enables pulsed LED dimming over a wide range of brightness levels.
These devices 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 average output current with ±3% accuracy. A hysteretic control method ensures excellent input supply rejection and fast response during load transients and PWM dimming. The MAX16822A allows 10% current ripple and the MAX16822B allows 30% current ripple. Both devices operate up to a switching frequency of 2MHz, thus allowing the use of small-sized components.
The MAX16822A/MAX16822B offer an analog dimming feature that reduces the output current by applying an external DC voltage below the internal 2V threshold voltage from TEMP_I to GND. TEMP_I also sources 25µA to a negative temperature coefficient (NTC) thermistor connected between TEMP_I and GND, thus providing an analog thermal-foldback feature that reduces the LED current when the temperature of the LED string exceeds a specified temperature point.
An additional feature includes thermal-shutdown protection that turns off the LX driver when the junction temperature exceeds +165°C.
The MAX16822A/MAX16822B operate over the -40°C to +125°C automotive temperature range and are available in an 8-pin SO package.
Key Features
Applications/Uses
High-Efficiency Solution
6.5V to 65V Input-Voltage Range
On-Board 65V, 0.85Ω Power MOSFET
Hysteretic Control: Up to 2MHz Switching Frequency
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