Conv DC-DC Single Step Down 2V to 5.5V 6-Pin SOT-23

The MAX1921EUT30 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 MAX1921EUT30 excellent highefficiency alternatives to linear regulators in spaceconstrained 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. The MAX1921EUT30 provides an adjustable output voltage (1.25V to 4V). The MAX1921EUT30 provides factory-preset output voltages. Both are available in space-saving 6-pin SOT23 packages. The MAX1920EUT30 is also available in a 6-pin TDFN package.

• 400mA Guaranteed Output Current
• Internal Synchronous Rectifier for >90% Efficiency
• Tiny 6-Pin SOT23 Package
• Available in 6-Pin TDFN Package (MAX1921EUT30)
• 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 (MAX1921EUT30)
• Adjustable Output Voltage (MAX1921EUT30)
• ±1.5% Initial Accuracy
• Soft-Start Limits Startup Current