MT9216

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 battery. The output voltage can be regulated as low as 0.6V. It 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. It is offered in a low profile 5-pin, 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.

Applications

• Cellular and Smart Phones
• Wireless and DSL Modems
• PDAs
• Portable Instruments
• Digital Still and Video Cameras
• MP3 Players

Key features

• High Efficiency: Up to 96%
• 1.5MHz Constant Frequency Operation
• 800mA Output Current
• No Schottky Diode Required
• 2V to 6V 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: 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
• SOT23-5 package