GENERAL DESCRIPTION

The CM3706 is a 1.5MHz constant frequency, slope compensated 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 CM3706 can supply 600mA of load current from a 2.5V to 5.5V input voltage. The output voltage can be regulated as low as 0.6V. The CM3706 can also run at 100 duty cycle for low dropout operation, extending battery life in portable system. Idle mode operation at light loads provides very low output ripple voltage for noise sensitive applications. The CM3706 is offered in a low profile (1mm) 5-pin, thin TSOT package, and is available in an adjustable version.

FEATURES

◆ High Efficiency: Up to 96

◆ 1.5Mhz Constant Switching Frequency

◆ 600mA Output Current at VIN=3V

◆ Integrated Main switch and synchronous rectifier. No Schottky Diode Required

◆ 2.5V to 5.5V Input Voltage Range

◆ Output Voltage as Low as 0.6V

◆ 100 Duty Cycle in Dropout

◆ Low Quiescent Current: 300µA

◆ Slope Compensated Current Mode Control for Excellent Line and Load Transient Response

◆ Short Circuit Protection

◆ Thermal Fault Protection

◆ <1uA Shutdown Current

◆ Space Saving 5-Pin Thin TSOT23 package

APPLICATIONS

◆ Cellular and Smart Phones

◆ Microprocessors and DSP Core Supplies

◆ Wireless and DSL Modems

◆ PDAs

◆ MP3 Players

◆ Portable Instruments

◆ Digital Still and Video Cameras