MAX16804 High-Voltage, 350mA LED Driver with
Analog and PWM Dimming Control General Description The MAX16804 current regulator operates from a 5.5V
to 40V input voltage range and delivers 35mA to 350mA
to one or more strings of high-brightness LEDs (HB
LEDs). The output current of the MAX16804 is set by
using an external current-sense resistor in series with the
LEDs. A dual-mode DIM pin and on-board 200Hz ramp
generator allow PWM dimming with an analog or PWM
input signal. The analog control signal at dimming input
DIM allows for a theater-dimming effect to be implemented.
Fast turn-on and turn-off times ensure a wide-range PWM
operation, while wave-shaping circuitry minimizes EMI. The
differential current-sense input increases LED current
accuracy and noise immunity. The MAX16804 is well suited for
applications requiring high-voltage input and is able to
withstand load-dump events up to 45V. An on-board pass
element minimizes external components while providing
3% output-current accuracy. Additional features include a
5V regulated output and short-circuit and thermal protection.
The MAX16804 is available in a thermally enhanced,
5mm x 5mm, 20-pin TQFN package and is specified over
the automotive -40°C to +125°C temperature range. Applications ●● Warning Lights for Emergency Vehicles
●● Navigation and Marine Indicators …