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MAX16822B Datasheet(PDF) 1 Page - Maxim Integrated Products |
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MAX16822B Datasheet(HTML) 1 Page - Maxim Integrated Products |
1 / 10 page General Description The MAX16822A/MAX16822B step-down constant-cur- rent high-brightness LED (HB LED) drivers provide a cost-effective design solution for automotive interior/exterior lighting, architectural and ambient light- ing, 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 tempera- ture 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 sens- ing 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 dim- ming. 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 volt- age from TEMP_I to GND. TEMP_I also sources 25µA to a negative temperature coefficient (NTC) thermistor con- nected 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 pro- tection 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 Features ♦ High-Efficiency Solution ♦ 6.5V to 65V Input-Voltage Range ♦ Output Current Up to 500mA ♦ On-Board 65V, 0.85Ω Power MOSFET ♦ Hysteretic Control: Up to 2MHz Switching Frequency ♦ ±3% LED Current Accuracy ♦ 200mV Current-Sense Reference ♦ Resistor-Programmable Constant LED Current ♦ Integrated High-Side Current Sense ♦ Thermal-Foldback Protection/Linear Dimming ♦ Thermal-Shutdown Protection ♦ Available in an 8-Pin SO Package ♦ -40°C to +125°C Operating Temperature Range 2MHz, High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense ________________________________________________________________ Maxim Integrated Products 1 Ordering Information LX LX PGND 1 2 8 7 TEMP_I DIM IN GND CS 3 4 6 5 MAX16822A MAX16822B L1 C2 ON OFF D1 HB LEDs NTC* *OPTIONAL RSENSE VIN C1 Typical Application Circuit 19-4141; Rev 2; 5/09 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. EVALUATION KIT AVAILABLE + Denotes a lead(Pb)-free/RoHS-compliant package. PART TEMP RANGE PIN-PACKAGE MAX16822AASA+ -40°C to +125°C 8 SO MAX16822BASA+ -40°C to +125°C 8 SO Pin Configuration appears at end of data sheet. |
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