High-Voltage, 3-Channel Linear High-Brightness LED Driver with Open LED Detection

 

Part Number	Replacement	Explanation

Description

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The MAX16823 three-channel LED driver operates from a 5.5V to 40V input voltage range and delivers up to 100mA per channel to one or more strings of high-brightness LEDs (HB LEDs). Each channel's current is programmable using an external current-sense resistor in series with the LEDs. Three DIM inputs allow a wide range of independent pulsed dimming in addition to providing the on and off control of the outputs. Wave-shaping circuitry reduces EMI while providing fast turn-on and turn-off times.

The MAX16823 is well suited for automotive applications requiring a high-voltage input and is able to withstand load-dump events up to 45V. On-board pass elements minimize external components while providing ±5% LED current accuracy. Additional features include an active-high, open-drain LEDGOOD output for open LED detection, a +3.4V (±5%) regulated output with 4mA output current capability, short-circuit and thermal protections.

The MAX16823 is available in thermally enhanced 5mm x 5mm, 16-pin TQFN-EP and 16-pin TSSOP-EP packages and is specified over the -40°C to +125°C automotive temperature range.

MAX16823: Block Diagram Enlarge+

Key Features

• 5.5V to 40V Operating Range
• Adjustable Constant Output Current (5mA to 100mA and Up to 2A with External BJT)
• ±5% Output Current Accuracy
• Open LED Detection
• Three Independent High-Voltage DIM Inputs
• Three Integrated Pass Elements with Low Dropout Voltage (0.7V max)
• Undervoltage Lockout
• Output Short-Circuit Protection
• 3.4V Voltage Regulator with 4mA Capability
• Accurate, Low 203mV Current Sense
• Overtemperature Shutdown
• -40°C to +125°C Operating Temperature Range

Applications/Uses

• Architecture and Industrial Lighting
• Automotive Exterior: Rear Combination Lights (RCLs), CHMSL
• Automotive Interior: RGB Ambient Lighting, Cluster Lighting, and LCD Backlighting
• Emergency Vehicle Warning Lights
• Navigation and Marine Indicators