What this part is and where it fits
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.
Key ratings and what they mean for the BOM
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.
Lifecycle and sourcing reality
The MAX1573ETE+ carries an Active lifecycle status with ROHS3 compliance. No official replacement has been announced; the part is still the recommended buy for new backlight designs requiring a 4-channel charge-pump driver.