LED controller with topology flexibility
The Maxim Integrated MAX16814ATP+ is a DC-DC controller designed for LED backlight and lighting applications, supporting SEPIC, step-down (buck), and step-up (boost) topologies. It drives up to four independent LED strings at 150 mA per channel using PWM dimming, making it suited for multi-string backlight panels or architectural lighting arrays where brightness control per string is needed. The wide input range from 4.75 V to 40 V covers common automotive and industrial bus voltages, and the -40°C to 125°C operating temperature range qualifies it for under-hood or outdoor enclosure deployment without additional screening.
Switching frequency and inductor sizing
The controller's switching frequency is programmable from 200 kHz to 2 MHz. At the high end, the designer can use physically smaller inductors and capacitors, shrinking the overall power-stage footprint on the PCB. At the low end, switching losses drop, which can improve efficiency in thermally constrained enclosures. The trade-off between inductor size and efficiency is a BOM-level decision this part accommodates without changing the controller IC.
Four-channel output and external switches
With four independent outputs, each rated at 150 mA, the MAX16814ATP+ can drive separate LED strings for color mixing, segmented backlight zones, or redundant lighting channels. Because the part has no internal switches, the external MOSFETs and sense resistors are selected by the designer to match the actual LED string voltage and current requirements. This external-switch architecture gives the BOM engineer control over the power-stage cost and thermal dissipation, but it also means the PCB layout must accommodate the gate-drive loop and current-sense routing for each channel.
Package and thermal design
The device comes in a 20-TQFN (4x4 mm) exposed-pad package. The exposed pad must be soldered to a PCB copper plane for thermal management; without a proper via stitch to the ground plane, the junction temperature can rise above the 125°C maximum under full load at high ambient. The surface-mount package is compatible with standard reflow profiles, and the ROHS3 compliance means no process change for lead-free assembly lines.
Lifecycle and sourcing posture
The MAX16814ATP+ is listed as Active with ROHS3 compliance.