Device Description
General
The MAX1921 step-down converter delivers over 400mA to outputs as low as 1.25V. This converter uses a unique proprietary current-limited control scheme that achieves over 90% efficiency. This device maintains extremely low quiescent supply current (50µA), and it’s high 1.2MHz (max) operating frequency permits small, low-cost external components. This combination makes the MAX1921 an excellent high-efficiency alternative to linear regulators in space-constrained applications.
Internal synchronous rectification greatly improves efficiency and eliminates the external Schottky diode required in conventional step-down converters. The device also includes internal digital soft-start to limit input current upon startup and reduce input capacitor requirements.
The MAX1921 provides factory-preset output voltages (see the Selector Guide) and is available in space-saving 6-pin SOT23 packages