MAX16822A
2MHz, High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense
High-Voltage, High-Efficiency LED Drivers with Integrated MOSFET Save Space and Cost
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Overview
Features and Benefits
- Cost-Effective Solution for Wide Range of LED Lighting Applications
- 6.5V to 65V Input Voltage Range
- Output Current Up to 500mA
- ±3% LED Current Accuracy
- Selectable Dimming Options: Linear or PWM
- Minimal Component Count Saves Cost and Space
- On-Board 65V, 0.85Ω Power MOSFET
- Resistor-Programmable Constant LED Current
- Integrated High-Side Current Sense with 200mV Current-Sense Reference
- Hysteretic Control: Up to 2MHz Switching Frequency
- Protection Features and Wide Operating Temperature Range Improves Reliability
- Thermal-Foldback Protection Dims LEDs to Minimize Overheating
- Thermal-Shutdown Protection
- Available in an 8-Pin SO Package
- Operation Over -40°C to +125°C Temperature Range
Product Details
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 and can provide an output current up to 350mA, if operated up to a temperature of +125°C, or up to 500mA, if operated up to a temperature of +105°C. A high-side current-sense resistor adjusts the output current 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.
Applications
- Architectural, Industrial, and Ambient Lighting
- Automotive RCL, DRL, and Fog Lights
- Heads-Up Displays
- Indicator and Emergency Lighting
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At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
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Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.