MAX1921EUT18+TG104

The MAX1920/MAX1921 step-down converters deliver over 400mA to outputs as low as 1.25V.
These converters use a unique proprietary current-limited control scheme that achieves over 90% efficiency.
These devices maintain extremely low quiescent supply current (50μA), and their high 1.2MHz (max) operating frequency permits small, low-cost external components. This combination makes the MAX1920/MAX1921 excellent high-efficiency alternatives 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. Both devices also include internal digital soft-start to limit input current upon startup and reduce input capacitor requirements.
Features● 400mA Guaranteed Output Current● Internal Synchronous Rectifier for > 90% Efficiency● Tiny 6-Pin SOT23 Package● Available in 6-Pin TDFN Package (MAX1920)● Up to 1.2MHz Switching Frequency for Small External Components● 50μA Quiescent Supply Current● 0.1μA Logic-Controlled Shutdown● 2V to 5.5V Input Range● Fixed 1.5V, 1.8V, 2.5V, 3V, and 3.3V Output Voltages (MAX1921)● Adjustable Output Voltage (MAX1920)● ±1.5% Initial Accuracy● Soft-Start Limits Startup CurrentApplications● Next-Generation Wireless Handsets● PDAs, Palmtops, and Handy-Terminals● Battery-Powered Equipment● CDMA Power Amplifer Supply