1.5MHz, 600mA,High Efficiency PWM Step-Down DC/DC ConverterThe TP3406 is a high-efficiency pulse-width-modulated(PWM) step-down DC-DC converter. Capable of delivering600mA output current over a wide input voltage range from2.5V to 5.5V, the TP3406 is ideally suited for port -ableelectronic devices that are powered from 1-cell Li-ion battery or from other power sources within the range suchas cellular phones, PDAs and handy-terminals.Internal synchronous rectifier with low RDS(ON) dramatically reduces cond -uction loss at PWM mode. No external Schottky diode is required in prac -tical application. The TP3406 automatically turns off the synchronous rec -tifier while the inductor current is low and enters discontinuous PWM mode. This can increase efficiency at light load condition.The TP3406 enters Low-Dropout mode when normal PWM cannot provide regulated output voltage by continuously turning on the upper P-MOSFET. TP3406 enter shutdown mode and consumes less than 0.1mA when EN pin is pulled low.The switching ripple is easily smoothed-out by small package filtering elem -ents due to a fixed operation frequency of 1.5MHz. This along with small SOT-23-5 and TSOT-23-5 package provides small PCB area application.Other features include soft start, lower internal reference voltage with 2% accuracy, over temperature protection,and over current protectionz +2.5V to +5.5V Input Rangez Adjustable Output From 0.6V to VINz 1.0V, 1.2V, 1.5V, 1.8V, 2.5V and 3.3V Fixed/ Adjustable Output Voltagez 600mA Output Current, 1A Peak Currentz 95% Efficiency                                                                                                        z No Schottky Diode Requiredz 1.5MHz Fixed-Frequency PWM Operationz Small SOT-23-5 and TSOT-23-5 Packagez RoHS Compliant and 100% Lead (Pb)-Free