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High-Voltage, 350mA, Adjustable Linear High-Brightness LED (HB LED) Driver

The MAX16800 current regulator operates from a 6.5V to 40V input voltage range and delivers up to a total of 350mA to one or more strings of high-brightness LEDs. The output current of the MAX16800 is adjusted by using an external current-sense resistor in series with the LEDs. An enable input allows wide-range “pulsed” dimming. Wave-shaping circuitry reduces EMI. The differential current-sense input increases noise immunity. The MAX16800 is well suited for applications requiring high-voltage input and is able to withstand automotive load-dump events up to 40V. An on-board pass element minimizes external components while providing ±3.5% output current accuracy. Additional features include a 5V regulated output and short-circuit and thermal protection. The MAX16800 is available in a thermally enhanced, 5mm x 5mm, 16-pin TQFN package and is specified over the automotive -40°C to +125°C temperature range.

# +6.5V to +40V Operating Range
# Adjustable Level (35mA to 350mA)
# ±3.5% Output Current Accuracy
# Integrated Pass Element with Low-Dropout Voltage (0.5V typ)
# Output Short-Circuit Protection
# +5V Regulated Output with 4mA Source Capability
# Thermal Shutdown
# Differential LED Current Sense
# High-Voltage Enable Pin for Dimming Interface
# Low Shutdown Supply Current (12µA typ)
# Low 204mV Current-Sense Reference Reduces Power Losses
# Wave-Shaped Soft Edges Reduce Radiated EMI During PWM Dimming
# Available in Small, Thermally Enhanced, 5mm x 5mm, 16-Pin TQFN Package
# -40°C to +125°C Operating Temperature Range
# Automotive Exterior: Tail Lights and CHMSL
# Automotive Interior: Map, Courtesy, and Cluster Lighting
# General Illumination
# Navigation and Marine Indicators
# Signage, Gasoline Canopies, Beacons
# Warning Lights for Emergency Vehicles

MAX16800 requires only small 2 ceramic capacitors at the Vin and +5V Regulator (0.1uF) to operate. It takes 85% less board space than other solutions

Martes, 30 Agosto, 2005 - 12:52
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