GENERALDESCRIPTION

The PW2058 is a constant frequency,current mode step-down converter. The device integrates a main switch and asynchronous rectifier for high efficiency without an external Schottky diode.It is ideal for powering portable equipment that runs from a single cellLithium-Ion (Li+) battery. The output voltage can be regulated as low as 0.6V. ThePW2058/PW2059 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 overthe wider range of the load.

FEATURES

l  High Efficiency: Up to 96%

l  1.5MHz Constant Frequency Operation

l  800mA Output Current

l  No Schottky Diode Required

l  2V to 6V Input Voltage Range

l  Output Voltage as Low as 0.6V

l  PFM Mode for High Efficiency in LightLoad

l  100% Duty Cycle in Dropout Operation

l  Low Quiescent Current: 20μA

l  Slope Compensated Current ModeControl for Excellent Line and Load Transient Response

l  Short Circuit Protection

l  Thermal Fault Protection

l  Inrush Current Limit and Soft Start

l  <1μA Shutdown Current

l  SOT23-5 package