Maxim’s MAX16813 is a four-channel, high-brightness and efficient LED driver. The device consists of four identical linear current-sink channels, adjustable from 20 mA to 150 mA with an accuracy of ±3% using a single external resistor. Multiple channels can be connected in parallel to achieve higher current per LED string. The device also features a unique pulsed dimming control through a logic input (DIM), with minimum pulse width as low as 500 ns. Protection features include output overvoltage, open-LED detection and protection, programmable shorted LED detection and protection, output undervoltage protection and detection, and overtemperature protection.

An integrated current-mode switching controller drives a DC-DC converter that provides the necessary voltage to multiple strings of LEDs. An internal current-mode switching DC-DC controller supports boost or SEPIC topologies and operates in an adjustable frequency range between 200 kHz and 2 MHz. An integrated spread-spectrum mode helps reduce EMI. Current-mode control with programmable slope compensation provides fast response and simplifies loop compensation. An adaptive output-voltage control scheme minimizes power dissipation in the LED current-sink paths. The device has a separate p-channel drive (PGATE) pin that is used for output undervoltage protection. Whenever the output falls below the threshold, the external p-MOSFET is latched off, disconnecting the input source. Cycling the EN or the input supply is required to restart the converter. The external p-MOSFET is off when the EN pin is below 0.3 V (typical). The shutdown current is 1 μA (typical) at an input voltage of 12 V.

The device accepts a wide 4.75 V to 40 V input voltage range and withstands direct automotive load-dump events. The wide input range allows powering HB LEDs for small- to medium-sized LCDs in automotive and general lighting applications and operates over the -40°C to +125°C automotive temperature range.