The Maxim Integrated MAX1573ETE+ is a DC-DC regulator LED driver built around a switched-capacitor charge pump topology. It drives four LED channels at 28 mA each, with PWM dimming.
Four outputs at 28 mA per channel is the headline rating — enough for a small backlight string or indicator array. The charge pump topology means no external inductor, which saves board area and BOM cost compared to a boost converter, but efficiency is lower at high input-to-output voltage ratios. PWM dimming allows linear brightness control without colour shift, critical for display backlights. The 1 MHz switching frequency pushes ripple into a band where small ceramic capacitors are effective, but layout must keep the switching loop tight to avoid radiated emissions.
No official replacement has been announced; the part is still the recommended buy for new backlight designs requiring a 4-channel charge-pump driver.