The MAX1623 switch-mode buck regulator with synchronous rectification provides local CPU and bus-termination power in notebook and desktop computers. An internal 55mΩ (typ), 3A PMOS power switch and 60mΩ (typ), 3A NMOS synchronous-rectifier switch deliver continuous load currents up to 3A from a 5V supply with 95% typical efficiency. Output accuracy is ±1%, including line and load regulation. The MAX1623 features constant-off-time, current-mode pulse-width-modulation (PWM) control with switching frequencies as high as 350kHz. An external resistor at the TOFF pin sets the off-time, allowing optimum design flexibility in terms of switching frequency, output switching noise, and inductor size. This device is available in a space-saving 20-pin SSOP package. Applications * 5V to 3.3V Conversion * CPU Daughter Card Supply * Desktop Computer Bus-Termination Supply * DSP Supply * Notebook Computer CPU I/O Supply * ±1% Output Accuracy, Including Line and Load Regulation * 94% Efficiency * Internal Switches * 55mΩ PMOS Power Switch * 60mΩ NMOS Synchronous-Rectifier Switch * Guaranteed 3A Load Capability * Minimal External Components * Pin-Selectable Fixed 3.3V, 2.5V, or Adjustable (1.1V to 3.8V) Output Voltage * 4.5V to 5.5V Input Voltage Range * 400µA (typ) Supply Current * <1µA Shutdown Supply Current * Constant-Off-Time PWM Operation * Switching Frequencies Up to 350kHz * Idle Mode™ Operation at Light Loads * Thermal Shutdown Protection * Available in 20-Pin SSOP https://elecena.pl/product/22317204/3a-low-voltage-step-down-regulator-with-synchronous-rectification-and-internal-switches 2022-12-27 https://elecena.pl/product/22317204/3a-low-voltage-step-down-regulator-with-synchronous-rectification-and-internal-switches 2025-01-18