The MAX741 is a highly versatile, pin‑programmed SMPS controller IC that operates from an input supply as low as 2.7 V and can start up from 1.8 V. It can be configured for step‑up, step‑down, or inverting topologies and supports both N‑channel and P‑channel MOSFETs in single‑ended, complementary, or push‑pull modes.
Key features include low supply current (1.6 mA), cycle‑by‑cycle current limiting, adjustable undervoltage lockout, shutdown control, and a bootstrap input for low‑voltage applications. The datasheet lists absolute maximum ratings, detailed electrical characteristics, pin functions, and example application circuits for various converter configurations.
| Supply Voltage Range | 2.7 V to 18.5 V |
|---|---|
| Low Supply Current (MAX741U) | 1.6 mA |
The MAX741 can start up from as low as 1.8 V.
Pin 7 provides a shutdown‑control input that disables the IC when V+ falls below the UVLO threshold.