PJ3406

PJ3406 1.5MHz, 1A Synchronous Step-Down Converter FEATURES  High Efficiency: Up to 96%  1.5MHz Constant Frequency Operation  1A Output Current  No Schottky Diode Required  2.0V to 5.5V Input Voltage Range  Output Voltage as Low as 0.6V  100% Duty Cycle in Dropout  Low Quiescent Current: 20µA  Slope Compensated Current Mode Control for Excellent Line and Load Transient Response  Short Circuit Protection  Thermal Fault Protection  Inrush Current Limit and Soft Start  <1µA Shutdown Current  Tiny SOT23-5 Package APPLICATIONS  Cellular and Smart Phones  Wireless and DSL Modems  PDAs  Digital Still and Video Cameras  MP3 Players GENERAL DESCRIPTION The PJ3406 is a constant frequency, current mode PWM step-down converter. The device integrates a main switch and a synchronous rectifier for high efficiency without an external Schottky diode. It is ideal for powering portable equipment that runs from a single cell Lithium-Ion (Li+) battery. The output voltage can be regulated as low as 0.6V. The PJ3406 can also run at 100% duty cycle for low dropout operation, extending battery life in portable system. This device offers two operation modes, PWM control and PFM Mode switching control, which allows a high efficiency over the wider range of the load. The PJ3406 is offered in a low profile(1mm) 5-pin, thin SOT package, and is available in an adjustable version and fixed output voltage of 1.2V,1.5V, 1.8V,2.5V and 3.3V. TYPICAL APPLICATION Figure 1. Basic Application...