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Numéro de sérieMAX16832C
CategoriePower Management => Lighting Controllers
Description2MHz, High-Brightness LED Drivers With Integrated MOSFET And High-Side Current Sense
The MAX16832A/MAX16832C 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 MAX16832A/MAX16832C operate from a +6.5V to +65V input voltage range. A high-side current-sense resistor adjusts the output current up to 700mA, and a dedicated pulse-width modulation (PWM) input enables pulsed LED dimming over a wide range of brightness levels.
SociétéMaxim Integrated Products
DatasheetTélécharger MAX16832C datasheet
 
 
  • Description courte

  • 2MHz, High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense

    The MAX16832A/MAX16832C 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 MAX16832A/MAX16832C operate from to +65V input voltage range. A high-side current-sense resistor adjusts the output current to 700mA, 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 MAX16832A allows 10% current ripple, and the MAX16832C allows 30% current ripple. Both devices operate a 2MHz switching frequency, thus allowing the use of small-sized components. The MAX16832A/MAX16832C 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 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. Additional features include thermal-shutdown protection. The MAX16832A/MAX16832C operate over the to +125°C automotive temperature range and are available in a thermally enhanced 8-pin SO package. o High-Efficiency Solution to 65V Input Voltage Range o On-Board 65V, 0.45 Power MOSFET o Hysteretic Control: to 2MHz Switching Frequency o ±3% LED Current Accuracy o 200mV Current-Sense Reference o Resistor-Programmable Constant LED Current o Integrated High-Side Current Sense o Thermal-Foldback Protection/Linear Dimming o Thermal-Shutdown Protection o Available in a Thermally Enhanced 8-Pin SO Package to +125°C Operating Temperature Range

    Features
    PART MAX16832AASA+ MAX16832CASA+ TEMP RANGE to +125°C PIN-PACKAGE 8 SO-EP* 8 SO-EP*
    Applications

    Architectural, Industrial, and Ambient Lighting Automotive RCL, DRL, and Fog Lights Heads-Up Displays Indicator and Emergency Lighting MR16 and MR111 LED Lights

    For pricing, delivery, and ordering information, please contact Maxim Direct 1-888-629-4642, or visit Maxim's website at www.maxim-ic.com.

    2MHz, High-Brightness LED Drivers with Integrated MOSFET and High-Side Current Sense MAX16832A/MAX16832C

    IN, CS, LX, DIM to +70V TEMP_I to +6V PGND to +0.3V Maximum Current into Any Pin (except IN, LX, and PGND).............................................20mA Continuous Power Dissipation (TA 8-Pin SO (derate 23.3mW/°C above +70°C)...........1860.5mW Junction-to-Ambient Thermal Resistance (JA) (Note 1).....43°C/W Operating Temperature to +125°C Junction Temperature......................................................+150°C Storage Temperature to +150°C Lead Temperature (soldering, 10s).................................+300°C Pin-to-Pin ESD Ratings......................................................±2.5kV

    Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a fourlayer board. For detailed information on package thermal considerations, refer to www.maxim-ic.com/thermal-tutorial.

    Stresses beyond those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.

    (VIN = +24V, VDIM = VIN, to +125°C, unless otherwise noted. Typical values are = +25°C.)

    PARAMETER Input Voltage Range Ground Current Supply Current UNDERVOLTAGE LOCKOUT (UVLO) VCS = VIN - 100mV, VIN rising until VLX < 0.5VIN VCS = VIN - 100mV, VIN falling until VLX 0.5 MAX16832A, VIN - VCS rising from 140mV until VLX > 0.5VIN, VDIM 5V MAX16832C, VIN - VCS rising from 140mV until VLX > 0.5VIN, VDIM 5V MAX16832A, VIN - VCS falling from 260mV until VLX 0.5VIN , VDIM 5V MAX16832C, VIN - VCS falling from 260mV until VLX < 0.5VIN, VDIM = 5V Falling edge of VIN - VCS from 260mV to VLX = 0.5VIN Rising edge of VCS - VIN from 140mV to VLX < 0.5VIN VIN - VCS = 200mV, VIN = VCS VIN = VDIM = 24V, VCS = 23.9V, ILX = 700mA VIN = VDIM = 6.0V, VCS = 5.9V, ILX = 700mA VDIM = 0V, VLX 6.0 V SYMBOL VIN No switching VDIM < 0.6V, VIN = 12V CONDITIONS MIN 1.5 350 TYP MAX 65 UNITS mA µA

    Propagation Delay to Output High Propagation Delay to Output Low CS Input Current INTERNAL MOSFET
    (VIN = +24V, VDIM = VIN, to +125°C, unless otherwise noted. Typical values are = +25°C.)

    PARAMETER DIM INPUT DIM Input-Voltage High DIM Input-Voltage Low DIM Turn-On Time DIM Input Leakage High DIM Input Leakage Low THERMAL SHUTDOWN Thermal-Shutdown Threshold Thermal-Shutdown Threshold Hysteresis THERMAL FOLDBACK Thermal-Foldback Enable Threshold Voltage Thermal-Foldback Slope TEMP_I Output Bias Current VTFB_ON FBSLOPE ITEMP_I VDIM = 5V VDIM 1/V µA Temperature rising +165 10

    CONDITIONS VIN - VCS = 100mV VCS - VIN = 100mV VDIM rising edge to VLX < 0.5VIN VDIM = VIN VDIM = 0V

    (VIN = VDIM = 48V, RSENSE = 220µH (connected between IN and CS). Typical values are = +25°C, unless otherwise noted.)

    1 LED 3 LEDs 15 LEDs 13 LEDs 11 LEDs 9 LEDs 7 LEDs 5 LEDs
    16 LEDs 1 LED 3 LEDs 11 LEDs 9 LEDs 7 LEDs 5 LEDs 15 LEDs