MT3420

MT3420 Rev.V1.2 1.4MHz, 2A Synchronous Step-Down Converter FEATURES High Efficiency: Up to 96% 1.4MHz Constant Frequency Operation 2A Output Current No Schottky Diode Required 2.5V to 5.5V Input Voltage Range Output Voltage as Low as 0.6V PFM Mode for High Efficiency in Light Load 100% Duty Cycle in Dropout Operation Low Quiescent Current: 40µA 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 TDFN33-10 package APPLICATIONS Cellular and Smart Phones Wireless and DSL Modems PDAs Portable Instruments Digital Still and Video Cameras PC Cards GENERAL DESCRIPTION The MT3420 is a 1.4MHz constant frequency, current mode step-down converter. It is ideal for portable equipment requiring very high current up to 2A from single-cell Lithium-ion batteries while still achieving over 90% efficiency during peak load conditions. The MT3420 also can run at 100% duty cycle for low dropout operation, extending battery life in portable systems while light load operation provides very low output ripple for noise sensitive applications. The MT3420 can supply up to 2A output load current from a 2.5V to 5.5V input voltage and the output voltage can be regulated as low as 0.6V. The high switching frequency minimizes the size of external components while keeping switching losses low. The internal slope compensation se...