The MAX25603 is a synchronous four-switch, buckboost
LED driver controller suitable for multifunction
automotive combination head lamps. The controller
regulates the LED current for LED string voltages from
0V to 60V. The MAX25603 can be used as a seamless
buck-boost LED driver for applications that require an
efficient buck-boost LED driver with synchronous
rectification. The MAX25603 is ideal for high-power
applications that require a current source with PWM
dimming capability.
The device provides seamless transition between buck,
boost, and buck-boost modes depending on the ratio of
input to output voltage. The MAX25603 is ideal for LED
driver applications in automotive, industrial, and other
LED lighting applications. A fault flag indicates open LED
or thermal shutdown conditions. The device uses Analog
Devices’ proprietary average-current-mode control
scheme and allows adjustable 200kHz to 440kHz fixedfrequency
operation. In addition, ±6% triangular spreadspectrum
is added internally to the oscillator to improve
EMI performance. The MAX25603 provides both analog
and digital PWM dimming in dual string applications with
time sharing. A single device can be used to power a
daytime running light (DRL), position light, high beam,
and low beam in an automotive front headlamp. The
MAX25603 integrates two high-side pMOS drivers for
PWM dimming applications that require fast rising and
falling edges of the LED current. It also features robust
output open and short protection, is AEC qualified, and
is suitable for automotive applications.
The MAX25603 uses Analog Devices’ proprietary
architecture to limit LED current overshoots and
overshoot durations during switchover in dual-string
applications in time-sharing mode. In multistring
applications in time-sharing mode, LED current
overshoots during switchover between strings is
minimized by an Analog Devices’ proprietary control
scheme.
Applications
- Combination Automotive Head Lamps
