Synchronous Buck and Buck Boost LED Driver / DC-DC Converter
EVALUATION KIT AVAILABLE Click here for production status of specific part numbers. MAX25610A/MAX25610B Synchronous Buck and Buck-Boost
LED Driver/DC-DC Converter General Description Benefits and Features The MAX25610A/MAX25610B are fully synchronous
LED drivers that provide constant output current to
drive high-power LEDs. The MAX25610A/MAX25610B
integrate two 60mΩ power MOSFETs for synchronous
operation, minimizing external components. Flexible
configuration supports buck, inverting buck-boost, and
boost conversion. The devices incorporate currentmode control that provides fast transient response and
eases loop stabilization. The MAX25610A/MAX25610B
include cycle by cycle current limiting, output overvoltage
protection (OVP), open-string protection, output shortcircuit protection (SCP), and thermal shutdown.
In LED driver applications, the MAX25610A/MAX25610B
provide analog dimming of the LED current through the
REFI pin, and PWM dimming through the PWMDIM
pin. Switching is enabled when PWMDIM is high, and
disabled with both MOSFETs off when PWMDIM is low.
Analog programming of the PWMDIM pin enables the
built-in digital dimming function, with dimming frequency
selected by the PWMFRQ pin.
The MAX25610A/MAX25610B include two 5V regulators.
A regulated 5V between VCC and AGND is used for IC
bias, REFI and PWMFRQ programming. Another low
current regulated 5V between VEE and INN is used for …