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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

Product Details

Key Features

Parametric specs for LED Drivers
VIN (V) (min) 6.5
VIN (V) (max) 65
Max. No. of LEDs 15
# LED Channels 1
Regulation Topology Inductor Based
LED Configuration Series
ILED per Channel (A) (max) 1
PWM Dimming Freq. (kHz) (max) 20
Dimming Ratio (max) 200
Dimming Control Analog
PWM
VDROPOUT (mV) (typ) 700
VCURR_SENSE (mV) 170
POUT (W) 40
ICC (mA) (max) 1.5
LED String Volt. (V) (max) 63
Switching Frequency (kHz) 2000
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
1.46
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Simplified Block Diagram

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Parameters

Parametric specs for LED Drivers
VIN (V) (min) 6.5
VIN (V) (max) 65
Max. No. of LEDs 15
# LED Channels 1
Regulation Topology Inductor Based
LED Configuration Series
ILED per Channel (A) (max) 1
PWM Dimming Freq. (kHz) (max) 20
Dimming Ratio (max) 200
Dimming Control Analog
PWM
VDROPOUT (mV) (typ) 700
VCURR_SENSE (mV) 170
POUT (W) 40
ICC (mA) (max) 1.5
LED String Volt. (V) (max) 63
Switching Frequency (kHz) 2000
Package/Pins SOIC (N)/8
Budgetary
Price (See Notes)
1.46

Key Features

  • Cost-Effective Solution for a Wide Range of LED Lighting Applications
    • 6.5V to 65V Input Voltage Range
    • Output Current Up to 1A
    • ±3% LED Current Accuracy
    • Selectable Dimming Options: Linear or PWM
  • Minimal Component Count Saves Cost and Space
    • On-Board 65V, 0.45Ω 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 Lighting Fixture Reliability
    • Thermal-Foldback Protection Dims LEDs to Minimize Overheating
    • Thermal-Shutdown Protection
    • Available in a Thermally Enhanced 8-Pin SO Package
    • Operation over -40°C to +125°C Temperature Range

Applications/Uses

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

Description

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 and can provide an output current up to 700mA, if operated up to a temperature of +125°C, or up to a 1A 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 MAX16832A allows 10% current ripple, and the MAX16832C allows 30% current ripple. Both devices operate up to 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 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. Additional features include thermal-shutdown protection.

The MAX16832A/MAX16832C operate over the -40°C to +125°C automotive temperature range and are available in a thermally enhanced 8-pin SO package.

Simplified Block Diagram

MAX16832A, MAX16832C: Typical Application Circuit MAX16832A, MAX16832C: Typical Application Circuit Zoom icon

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .