ACT8311

Active-Semi FEATURES ACT8309/8310/8311 Rev PrA, 24-Jan-08 Advanced Product Information – All Information Subject to Change 1.5A, PWM Step-Down DC/DCs in TDFN GENERAL DESCRIPTION The patent-pending ACT8309/ACT8310/ACT8311 are current-mode, fixed-frequency PWM, synchronous step-down DC/DC converters that are capable of delivering 1.5A with efficiency of up to 95%. These devices operate with a fixed frequency of 1.35MHz, minimizing noise in sensitive equipment as well as optimizing both efficiency and component size and cost. These devices feature very low-resistance power MOSFET and 100% duty cycle operation, making them ideal choices for portable applications requiring a 3.0V or 3.3V rail to be generated from a Li+ battery. The ACT8311 is capable of supplying up to 1.5A of output current, while the ACT8309 and ACT8310 are capable of supplying up to 900mA and 1.2A, respectively. All three devices have adjustable output voltages that are programmable down to 1.2V. Contact Active-Semi for custom fixed output voltage availability. Multiple Patents Pending Up to 95% High Efficiency Up to 1.5A Guaranteed Output Current (ACT8311) 1.35MHz Constant Frequency Operation Internal Synchronous Rectifier Eliminates Schottky Diode ACT8309: Up to 900mA ACT8310: Up to 1.2A ACT8311: Up to 1.5A 100% Duty Cycle Low-Dropout Operation 0.1µA Shutdown Current Small TDFN33-8 Package − RoHS-Compliant Independent Enable/Disable Control Minimal External Components APPLICATIO...