The MT3124 is a 3.5A high efficiency constant ontime controlled synchronous step-down converter.It operates with input voltage from 2.5V to 6V and provide output range from 0.6V to as high as input level,thanks to its 100%duty cycle operation.Its advanced constant on-time control Fast-PWM scheme simplifies loop compensation and offers excellent load transient response while maintaining a relatively constant 1.2MHz switching frequency.MT3124 consumes extremely low 15µA quiescent current hence achieves superior light load efficiency.The high gain error amplifier in the control loop provides excellent load and line regulation.For fault tolerant operation,MT3124 has cycle-by-cycle current limit protection and hiccup mode for short circuit or over-load condition.MT3124 is available in QFN2x2mm package and ideal for high performance,portable applications.

 

 

　　FEATURES

 

　　-Wide Input Range from 2.5V to 6V

 

　　-High Efficiency up to 97%

 

　　-Output Voltage as low as 0.6V

 

　　-100%Duty Cycle Operation

 

　　-+/-1.5%0.6V Feedback Voltage Accuracy

 

　　-1.2MHz Pseudo Constant Switching Frequency

 

　　-15µA Quiescent Current

 

　　-Continuous Output Current up to 3.5A

 

　　-Built-in 46mΩHS and 38mΩLS Power Switches

 

　　-Cycle-by-Cycle Current Limit Protection

 

　　-Hiccup Mode for Short Circuit and Over-Load

 

　　Protection

 

　　-Open Drain Power Good Indication with Internal Pullup Resistor

 

　　-Thermal Shutdown Protection

 

　　-Stable with low ESR ceramic Output Capacitors

 

　　-Available in Small QFN2x2mm_12L Package

 

　　-Pb-Free RoHS Compliant

 

　　APPLICATIONS

 

　　-Solid-State and Hard Disk Drives

 

　　-Portable/Handheld Devices

 

　　-WiFi Module,Set-top Boxes

 

　　-DC/DC Micro Modules