The MAX16821A/MAX16821B/MAX16821C pulse-width-modulation (PWM) LED driver controllers provide high output-current capability in a compact package
with a minimum number of external components. The MAX16821A/MAX16821B/MAX16821C are suitable for use in synchronous and nonsynchronous step-down
(buck), boost, buck-boost, SEPIC, and Cuk LED drivers. A
logic input (MODE) allows the devices to switch between
synchronous buck and boost modes of operation. These
devices are the first high-power drivers designed specifically
to accommodate common-anode HB LEDs.
The ICs offer average current-mode control that enable
the use of MOSFETs with optimal charge and on-resistance
figure of merit, thus minimizing the need for
external heatsinking even when delivering up to 30A of
LED current.
The differential sensing scheme provides accurate control
of the LED current. The ICs operate from a 4.75V to
5.5V supply range with the internal regulator disabled
(VCC connected to IN). These devices operate from a
7V to 28V input supply voltage with the internal regulator
enabled.
The MAX16821A/MAX16821B/MAX16821C feature a
clock output with 180° phase delay to control a second
out-of-phase LED driver to reduce input and output filter
capacitor size and to minimize ripple currents. The
wide switching frequency range (125kHz to 1.5MHz)
allows the use of small inductors and capacitors.
Additional features include programmable overvoltage
protection and an output enable function.
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