FEATURES

 High Efficiency: Up to 95%

 1.4MHz Constant Frequency Operation

 2A Output Current

 No Schottky Diode Required

 2.4V to 5.5V Input Voltage Range

 Output Voltage as Low as 0.6V

 Low Quiescent Current: 40µA

 Slope Compensated Current Mode Control for

Excellent Line and Load Transient Response

 Inrush Current Limit and Soft Start

 <1µA Shutdown Current

 Available in DFN33-10 and WQFN-16L 3x3

package

APPLICATIONS

 Cellular and Smart Phones

 Wireless and DSL Modems

 PDAs

 Digital Still and Video Cameras

 PC Cards

GENERAL DESCRIPTION

The MT3420 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 MT3420 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