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                  Home > Step Down Switching Regulators
                  UD05123 Datasheet


                  2.25MHz, 1.2A, VFB=0.6V SYNCHRONOUS STEP-DOWN CONVERTER






                  UTC UD05123 is a 2.25MHz constant frequency current mode

                  PWM step-down converter. It is ideal for portable equipment

                  requiring very high current up to 1.8A from single-cell Lithium-ion

                  batteries while still achieving over 90% efficiency during peak load

                  conditions. The 2.5V to 5.5V input voltage range makes UTC

                  UD05123 ideally suited for single Li-Ion, two to four AA

                  battery-powered applications. 100% duty cycle provides low

                  dropout operation, extending battery life in portable systems. Pulse

                  skipping mode operation provides very low output ripple voltage for

                  noise sensitive applications. Switching frequency is internally set at

                  2.25MHz, allowing the use of small surface mount inductors and

                  capacitors. The internal synchronous switch increases efficiency

                  and decreases need of an external Schottky diode. Low output

                  voltages are easily supported with the 0.6V feedback reference





                  * Input Voltage Range :2.5V~5.5V

                  * Output Voltage: from 0.6V to VIN

                  * High Efficiency: Up to 92%

                  * Constant Frequency Operation: 2.25MHz

                  * Output Current:1.2A

                  * Quiescent Current: 50uA (input < 4.2V)

                  * No Schottky Diode Required

                  * 100% Duty Cycle in Dropout

                  * 0.6V Reference Allows Low Output Voltages

                  * Current Mode Operation for Excellent Line and Load Transient Response

                  * Current limit, Enable function

                  * Short Circuit Protect (SCP)

                  * ≤1μA Shutdown Current

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